Leave the repairs and renovations of condominiums and apartments in Inagi City, Tokyo to Kakeru Koumuten Co., Ltd.!
Large-scale Repairs for Condominiums, Apartments, and Buildings in Inagi City, Tokyo
To owners, management associations, and management companies considering large-scale repairs for condominiums, apartments, and buildings in Inagi City, Tokyo.
Kakeru Koumuten Co., Ltd. is a company that handles exterior repairs with comprehensive management and self-performance from the installation of temporary scaffolding to substrate repairs, exterior wall painting, tile repairs, sealing, waterproofing of rooftops and balconies, and roofing work. We have undertaken numerous large-scale repairs and exterior renovations for apartments, condominiums, and commercial facilities in Inagi City.
- On-site surveys and estimates are completely free (multiple estimates are welcome)
- Comprehensive management from temporary scaffolding to exterior and roofing work
- Our own scaffolding team handles sites in Inagi City, from condominiums to apartments
- Consultations for partial repairs and emergency measures for leaks are also possible
- Cost Estimate / For condominiums, the cost per unit is approximately 750,000 to 1,500,000 yen (according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, about 70% fall within this range, with the most common being 1,000,000 to 1,250,000 yen. This amount excludes consumption tax and common temporary costs). For wooden apartments, the estimate is 2,000,000 to 4,000,000 yen per building.
- Estimated Cycle / 12 to 15 years. However, the determining factor is not the number of years but the condition of deterioration.
- Particularly Relevant in Inagi City / According to the city’s condominium actual condition survey (fiscal year 2022, report published in March 2023), there are approximately 10,500 condominiums in the city, with 83 out of 209 surveyed buildings being 21 to 30 years old (39.7%), and 36 buildings (17.2%) being of old seismic standards, of which 27 were in the Hirao condominium area. The city’s seismic retrofitting promotion plan estimates that about 66% of residences are collective housing (according to our calculations). There are also landscape regulations, including Tokyo’s landscape ordinance notifications and the city’s landscape color guidelines, with 33 district plans in the city. In areas covered by district plans, repainting of exterior walls and roofs, even in the same color, requires notification, which must be done 30 days prior to commencement and before confirmation application.
- Available Funding / The official page of Inagi City did not confirm any city programs that subsidize the construction costs or deterioration diagnosis costs for large-scale repairs. The city provides information on management plan certification and consultation windows. If requirements are met, there is a one-third reduction special provision for fixed asset tax (Inagi City tax. Work must be completed by March 31, 2027, and reported within three months after completion), interest subsidies from Tokyo (applications for the second phase of fiscal year 2026 are accepted until February 19, 2027), and public financing can be considered in combination. The city’s CN housing equipment subsidies are for individuals and closed on October 14, 2026.
- Tips for Success / At least three comparative estimates. Compare not only the amounts but also the quantities, methods, and materials.
Large-scale repair work available in Inagi City, Tokyo
Large-scale repairs are not just “exterior painting” or “waterproofing,” but a comprehensive project to address the deterioration of the entire building while scaffolding is in place. At Kakeru Koumuten, we can handle all of the following work with our own team, ensuring clear responsibility and coordination of the process.
| Type of Work | Main Content |
|---|---|
| Temporary Scaffolding Work | Installed by our own scaffolding team using our own scaffolding materials. We handle mesh sheets, protection, and fall prevention measures. |
| Substrate Repair Work | Crack repairs, injection of floating mortar and tiles, explosion (exposed rebar) repairs, resin mortar repairs for missing parts. |
| Exterior Wall Painting Work | High-pressure washing, three coats of paint from primer to topcoat, painting of ancillary parts (iron parts, gutters, water cut-offs, etc.). We accommodate radical control type, fluorine, and inorganic paints. |
| Tile Repair Work | Replacement of broken tiles, joint repairs, clear waterproofing of tile surfaces (such as Seven S). |
| Sealing Work | Replacement and additional sealing around sashes and exterior wall joints. |
| Waterproofing Work | Urethane waterproofing for rooftops, roof balconies, shared corridors, and stairs, PVC sheet waterproofing, and installation of long sheets. |
| Roof Work | Roof painting, roof overlay (cover method), re-roofing, and ridge cap replacement. We have sheet metal craftsmen who can handle large roofs such as factories. |
| Iron and Hardware Work | Surface painting of steel staircases, handrails, and PS doors, replacement of caps and water cut-offs. |
| Drainage and Wastewater Work | Cleaning and renovation of roof drains (insertion of renovation drains), resolving gutter blockages. Drainage issues can cause puddles and leaks, making this work particularly important for buildings with rooftops. |
| Others | Replacement of rain gutters, rooftop and exterior wall inspections using drones, leak investigations using thermography, and preliminary investigations of asbestos-containing materials. |
Scope of Major Repairs Determined by Building Diagnosis
It is not always necessary to carry out all of the above works. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten Co., Ltd., we conduct a free on-site survey to confirm the items below, compile a deterioration diagnosis report with photos, and propose the scope of work.
| Diagnosis Area | Main Investigation Method | Scope of Work Determined by Diagnosis Results |
|---|---|---|
| Exterior Wall (Painted Surface) | Visual inspection, checking the width of cracks and the condition of the paint film | Methods and quantity for crack repair, specifications for painting (whether to repaint or paint after removing the existing paint film) |
| Exterior Wall (Tile Surface) | Sounding investigation. High areas checked with a drone | Scope and estimated quantity for injection and replacement, whether clear waterproofing is necessary |
| Sealing | Checking for cracks, shrinkage, peeling, and hardening | Whether to replace or add to the existing seal, scope of joints to be worked on |
| Roof, Balcony, Shared Corridor | Checking for blisters or breaks in the waterproof layer, puddles, and the condition of drains | Full renovation or partial repair, method (urethane waterproofing, PVC sheet waterproofing, long sheet), whether drain renovation is necessary |
| Leak Areas | Investigation using thermal imaging camera and drone | Identification of the cause and priority areas for repair |
| Metal Parts, Roof, Accessories | Checking for rust, corrosion, lifting, and cracking | Whether it can be resolved with painting or if material replacement or cover method is necessary |
| Site and Surroundings | Checking retaining walls, slopes, trees, access routes, and parking | Planning for scaffolding and scope of temporary work |
Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Inagi City, Tokyo
The reason why we can be entrusted with large-scale renovations in Inagi City is due to our “initiatives that cannot be imitated by other companies in large-scale renovation work”, which have received high praise from many customers.
1. Equipment Specialized for Exterior Renovations
At Kakeru Koumuten, we have prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior wall painting and waterproofing work for large-scale renovations. We have established five bases centered around Yokohama City for material storage and showrooms.
In-house Scaffolding Materials
We own the scaffolding materials necessary for temporary scaffolding required for large-scale renovations and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs on scaffolding work and provide quick and flexible responses.
We have approximately enough scaffolding materials for 100 single-family homes!
Storage of Materials in Our Large Warehouse
We store paints and substrate repair materials used for exterior renovations. By ordering a large quantity of materials at once, we canprocure materials at a lower cost! Additionally, we always have stock available, allowing us to provide swift responses in emergencies!
In-house Waste Separation
In large-scale renovations, various waste materials such as leftover paint, metal, and wood are generated. At Kakeru Koumuten, we separate and recycle waste materials in-house, which helps reduce waste disposal costs.
Showroom Dedicated to Exterior Renovations
In the showroom, not only can you have meetings, but you can also check actual samples and colors of exterior materials. Color simulations for exterior wall painting and thermal insulation tests using a thermal insulation testing machine are also available!
2. Cost Reduction through In-House Management and Construction
One of Kakeru Koumuten’s major strengths is in-house management and construction.
By managing everything from inquiries to project completion in a consistent system, we can keep costs down while providing high-quality large-scale repairs. Additionally, one representative will handle everything from the estimate to project completion. Since the person in charge does not change, communication can proceed smoothly.
We can handle everything from temporary scaffolding installation to exterior wall painting, substrate repair, waterproofing work, and tile repairs with complete in-house construction! Those with specialized knowledge and experience conduct inspections and actual construction for each process!
3. Obtaining Various Permits and Skilled Workers on Staff
We have obtained construction industry licenses and permits for industrial waste collection and transportation! We also have national qualified sheet metal and painting technicians on staff, and we are confident in our construction techniques. We can handle large-scale roofing work for factories and other facilities! We also have qualified personnel for asbestos work supervisors and building materials containing asbestos investigators, so we can handle asbestos-containing roofing materials and pre-investigations.
4. Warranty and Aftercare
Most large-scale repair works, including “painting work,” “substrate repair work,” and “waterproofing work,” come with a warranty!
Aftercare maintenance is available every year, and we send out notification DM each year.
5. Flexible and Prompt Response
Our company is equipped to handle various troubles and situations related to apartments and condominiums.
We can also address exterior walls and rooftops that cannot be checked from high places using drones! During leak investigations, we can use a thermal imaging camera to help identify the cause of leaks!
We will respond according to your wishes. We also accept emergency measures for sudden leaks! We will promptly respond to urgent requests or emergencies!
6. Staff Development
Our staff create various models to enhance their skills and conduct practical training. Since different sites require various processing and techniques, we regularly provide skill enhancement education to ensure each staff member can respond appropriately. We also educate on points to be careful about and areas to check during each stage of large-scale repair work.
7. Consideration for Residents and Neighbors
During large-scale renovation work, we will not only notify residents and greet nearby residents, but also install a notice board at the entrance to display the construction schedule and announcements! Additionally, we will thoroughly educate entrants on manners to minimize any inconvenience to residents and neighbors.
8. Strict Quality Control
Each process will be inspected by a responsible person, and detailed construction photos will be taken. We will use thickness inspection equipment and check sheets to ensure that there are no oversights in inspections. During exterior wall painting and waterproofing work, we will check the number of used paint cans to confirm that the specified amount of paint is being used, and by ordering paint in-house, we will prevent construction defects. Of course, we will also take photos of the used paint and report them.
9. Exterior Wall Painting Color Simulation
9-1 Self Color Simulation
The simulations we create can be done using photos of your actual apartment or building!You can also perform simulations on your smartphone or computer. By simulating and then applying a two-tone color or changing the image, we hope to enhance the stylish appearance and contribute to an increase in occupancy rates! Of course, we can also arrange for paint samples to confirm the actual colors.
* In Inagi City, there are landscape color guidelines, and while no notification is required outside the district planning area, it is requested to avoid prominent colors such as high saturation. In the district planning area (33 districts within the city), notification is required for changes in form and design, including repainting of exterior walls and roofs, even if the same color is used, and this must be done 30 days prior to commencement and before the building confirmation application. Additionally, in the areas governed by the Tokyo Metropolitan Landscape Plan, repairs, remodeling, or color changes that alter the appearance of buildings are subject to notification based on the Tokyo Metropolitan Landscape Ordinance, and according to the city’s Q&A, repainting with the same color is also included (normal maintenance activities such as tile repairs are excluded). Notifications must be submitted 30 days before the start of construction, and whether it is subject to notification is judged based on the overall scale of the building rather than the parts being changed. Having a color simulation screen can help facilitate smooth explanations to the general meeting, neighbors, owners, and residents.
9-2 Confirm the actual color with a test paint!
You can order samples of the paint being considered and perform test painting on your exterior wall. By conducting a test paint, you can confirm the actual color and gloss!
9-3 Exterior Renovation Simulation
Exterior simulations for apartments and condominiums are also possible!
・Exterior wall color simulation (two-tone colors are also possible)
・Simulation for when metal siding is applied
・Simulation for when accent materials such as cornices and louvers are used
・Simulation for roof painting and roof replacement work
With exterior renovation simulations, you can minimize the risk of failure in image changes! We hope that renovating the appearance of your apartment or condominium will help increase occupancy rates.
Cost Estimates for Major Repairs in Inagi City, Tokyo
The cost of major repairs varies greatly depending on the size of the building, its deterioration status, the scope of work, and the materials used. First, refer to the national average based on public statistics, then to our company’s estimates based on construction results by scale, and finally to examples of unit prices for each project.
The national average for condominiums is 750,000 to 1,500,000 yen per unit
According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which compiled 818 construction case studies (FY 2021), approximately 70% of the costs for large-scale renovation projects are concentrated in the range of 750,000 to 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Additionally, since this survey’s amounts do not include consumption tax and common temporary costs, they differ from the current total construction costs including tax.
| Construction Cost per Unit | Percentage | Construction Cost per Unit | Percentage |
|---|---|---|---|
| Up to 750,000 yen | 15.1% | 1,250,000 to 1,500,000 yen | 17.4% |
| 750,000 to 1,000,000 yen | 24.7% | 1,500,000 to 2,000,000 yen | 9.1% |
| 1,000,000 to 1,250,000 yen | 27.0% (most common) | Over 2,000,000 yen | 2.8% |
Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Renovation Projects for Condominiums” (200 companies, 818 cases) *The amounts do not include consumption tax and common temporary costs. The percentages do not total 100% due to rounding and non-responses.
Breakdown of Construction Costs (What the Money is Spent On)
| Category | Composition Ratio | Main Contents |
|---|---|---|
| Construction-related Work | 60.3% | About half for exterior walls, about one-third for waterproofing. Substrate repairs, tiles, painting, waterproofing |
| Temporary Work | 22.8% | Scaffolding, mesh sheets, protective coverings, etc. (does not include common temporary costs) |
| Miscellaneous Expenses | 10.3% | Site management fees, general management fees, statutory welfare expenses, etc. (9.5%), insurance premiums for large-scale renovation defect insurance (0.8%) |
Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Renovation Projects for Condominiums” (Second survey of large-scale renovation projects. Overall average is construction-related 59.0%, temporary work 22.3%, miscellaneous expenses 9.9%). *The total does not equal 100% because equipment-related work, exterior works, and others are included. This is an average value and is not a criterion for judging the appropriateness of individual estimates.
Cost Estimates by Building Size (Scaffolding, Substrate Repair, Exterior Painting, Waterproofing, Sealing)
| Type and Size of Building | Cost Estimate | Estimated Construction Period |
|---|---|---|
| Wooden Apartment (2 stories, 6-10 units) | 2,000,000 – 4,000,000 JPY | 3 – 5 weeks |
| Steel Frame/RC Apartment (3 stories, 10-20 units) | 4,000,000 – 9,000,000 JPY | 1 – 2 months |
| Mixed-Use Building/Small Apartment (4-5 stories) | 5,000,000 – 15,000,000 JPY | 1.5 – 3 months |
| Medium-Sized Apartment (30-50 units) | 20,000,000 – 50,000,000 JPY | 3 – 5 months |
| Large Apartment (over 100 units) | Around 100,000,000 JPY and up | 6 months and up |
*The above estimates are based on Kakeru Koumuten’s construction records and may vary depending on the presence of roofing work, metal work, plumbing, etc. For apartments, please also use the amount calculated by multiplying the national statistics (750,000 – 1,500,000 JPY per unit) by the number of units as a guideline.
Breakdown of Costs for Temporary Structures, Substrate Repair, Exterior Walls, and Waterproofing
The estimate for large-scale repairs is broadly divided into “temporary structures,” “substrate repair,” “sealing,” “exterior painting,” “waterproofing,” and “miscellaneous expenses.” Before comparing total amounts, please check what each item includes, how much, and at what cost.
| Item | What to Confirm in the Estimate |
|---|---|
| Building Prerequisites | Structure (wooden, steel frame, RC), number of floors, number of units, exterior wall area, and waterproof area. Also confirm whether the area is based on drawings or actual measurements. |
| Common Temporary Works & Scaffolding | Area and unit price of scaffolding, mesh sheets, protection, temporary toilets, etc. According to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, temporary works such as scaffolding account for about 20% of construction costs (excluding common temporary costs). |
| Substrate Repair | Quantities and unit prices for repair methods such as cracks, lifting, and spalling. Since these items are not finalized until scaffolding is erected, confirm whether it will be estimated quantities or actual settlement, and the settlement method if quantities increase or decrease. |
| Sealing | Whether it is a replacement or additional application, the length to be applied (m), and the name of the material. |
| Exterior Wall Painting | Painting area (㎡), name of the paint manufacturer, product name, grade, number of coats, and scope of ancillary parts. |
| Waterproofing | Area for each part such as roof, balcony, and common corridor, construction method, name of the material, and whether drain renovations are included. |
| Inspection & Reporting | Inspections for each phase, construction photos, and whether the completion report and warranty are included. |
| Miscellaneous Expenses | Contents and proportions of site management fees, general management fees, statutory welfare expenses, etc. According to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, the average is about 10% of construction costs, but it varies depending on the size and conditions of the building, so there is no uniform standard. |
| Tax Classification | Whether the amount is tax-inclusive or tax-exclusive. Since the display varies by company, always ensure they are aligned before comparing total amounts. |
Unit Price Examples for Repair Work
| Repair Method | Materials Used | Cost |
|---|---|---|
| Tile Replacement | Existing Similar Tiles | per piece / 2,000 JPY〜4,000 JPY |
| Repair of Floating Tile and Mortar Areas | Epoxy Resin Injection | per square meter / 3,000 JPY〜5,000 JPY （Varies depending on the degree） |
| Tile Joint Mortar Repair | Mortar for Tile Joints | per square meter / 1,000 JPY〜2,000 JPY （Varies depending on the degree） |
| Concrete Spalling Repair | Rust Preventive for Rebar + Resin Mortar | per area / 1,000 JPY〜2,000 JPY （Varies depending on the degree） |
| Crack Repair | Filler or Polymer Cement | per meter / 100 JPY〜2,500 JPY （Varies depending on the degree） |
| Exterior Wall Painting (3 Coats) | Radical Control Silicone Paint | per square meter / 2,500 JPY〜3,500 JPY |
| Roof Waterproofing with Urethane (Ventilated Buffer Method) | High Strength Urethane | per square meter / 6,500 JPY〜9,500 JPY |
| Sealing Replacement | Modified Silicone | per meter / 900 JPY〜1,500 JPY |
| Temporary Scaffolding | In-house Owned Scaffolding Materials (Wedge Type) | per square meter / 700 JPY〜1,000 JPY |
*Costs and warranty periods vary based on shape, quantity, substrate condition, and type of materials. If you would like a detailed estimate, please feel free to contact us. Estimates are completely free.
Select Paint and Waterproofing Grades Based on “Years Until Next Repair”
“Good paint does not equal the right choice.” Aligning when to do the next major repair with the lifespan of the materials is the most efficient way to choose.
| Grade | Estimated Lifespan | Suitable Cases |
|---|---|---|
| Silicone / Radical Control Type | 10-16 years | Buildings that are cycled every 12-15 years. A good balance of cost and performance. The lifespan varies by product, so choose specifications that match the cycle. |
| Fluorine | 16-20 years | Buildings that want to set the next repair after 15 years, high-rise or complex-shaped buildings with high scaffolding costs. |
| Inorganic | 18-22 years | Buildings that want to suppress dirt adhesion. Effective for suppressing moss and algae on the north side or poorly lit areas. |
| Urethane Waterproofing (Rooftop) | 8-15 years | Complex-shaped rooftops, when wanting to renovate while utilizing the existing waterproof layer. Mid-term inspections and repairs, such as re-coating the top coat, are prerequisites. |
| Vinyl Sheet Waterproofing | 20-25 years | Rooftops with a large area and simple shape. Short construction period. |
| Asphalt Waterproofing | 15-20 years | Rooftops planned for long cycles. The cost per instance will increase. |
*The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. Choosing paints with anti-algae and anti-mold properties can improve durability in shaded and humid areas.
Guidelines for Repair Reserve Funds and Options When Insufficient
The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the estimated repair reserve fund on a monthly basis per exclusive area. Additional charges are required if there is a mechanical parking lot.
| Building Size (Less than 20 Floors) | Monthly Estimate (Average) | Range Covering Two-Thirds of Cases | Conversion for 70㎡ |
|---|---|---|---|
| Building Area Less than 5,000㎡ | 335 JPY/㎡ | 235-430 JPY/㎡ | Approximately 16,500-30,100 JPY |
| 5,000-10,000㎡ | 252 JPY/㎡ | 170-320 JPY/㎡ | Approximately 11,900-22,400 JPY |
| 10,000-20,000㎡ | 271 JPY/㎡ | 200-330 JPY/㎡ | Approximately 14,000-23,100 JPY |
| Over 20,000㎡ | 255 JPY/㎡ | 190-325 JPY/㎡ | Approximately 13,300-22,750 JPY |
Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Repair Reserve Funds for Condominiums” (Reiwa 6 June Revision – PDF) / National average is 13,378 JPY per unit per month (Reiwa 5 Fiscal Year Comprehensive Survey of Condominiums)
In the Reiwa 5 Fiscal Year Comprehensive Survey of Condominiums, 36.6% of management associations reported that “the repair reserve fund is insufficient compared to the plan.” There are four main options when funds are insufficient.
| Options | Considerations and Points to Note |
|---|---|
| ① Adjusting the Construction Schedule | Based on the deterioration diagnosis, postpone less urgent construction to the next time. However, it is essential to distinguish between construction that can be postponed and that which cannot, as delaying waterproofing and tile detachment measures can ultimately be more costly. |
| ② Reviewing the Scope and Specifications of Work | Revising paint grades, changing from full renovations to partial renovations, etc. Please consider this separately from “apparent reductions” that skip processes. |
| ③ Utilizing Subsidies and Tax Systems | Inagi City’s management plan certification, reduction of fixed property tax, subsidies for energy-saving renovations from the national government and Tokyo Metropolitan Government, etc. (to be discussed later). The reduction of fixed property tax is a system that lowers the tax amount for each unit owner, and does not directly increase the repair funds of the management association. |
| ④ Increasing Reserve Funds, Borrowing, and One-Time Payments | In addition to considering an increase in repair reserve funds at the general meeting, the Housing Finance Agency’s condominium common area renovation loan requires no collateral. Interest rates can be lowered by obtaining management plan certification. |
Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Inagi City, Tokyo
Based on the information confirmed on Inagi City’s official page, there does not appear to be a municipal system that subsidizes the construction costs of large-scale renovations for condominium units. The city provides information on fixed property tax reductions, management plan certification, condominium consultation windows, and introductions to Tokyo Metropolitan Government systems. The available options can be broadly categorized into the following five types. The eligibility and application status of these systems may change even during the fiscal year, so please be sure to confirm with our company or each window before contracting or starting construction.（As of October 15, 2026）
| Type | Details |
|---|---|
| ① Support for Inagi City | Consultation desk for condominiums, publication of actual survey on condominium sales. The city’s seismic reinforcement subsidy is applicable to wooden houses. The consultation desk is the Urban Development and Regeneration Division. |
| ② Tax Incentives | Reduction of property tax under the condominium longevity promotion tax system (Inagi City has property tax as a city tax, with a reduction rate of one-third. Applications must be submitted to the taxation division within three months after the completion of the work). |
| ③ Management Plan Certification System | A certification system that serves as an entry point for tax incentives and reduced loan interest rates. Condominiums in Inagi City apply through the Urban Development and Regeneration Division, which provides procedural support services from the condominium management center. |
| ④ Construction Subsidies for Specific Purposes | Energy conservation (windows, insulation, etc.), seismic reinforcement, etc. The carbon-neutral housing equipment subsidy from Inagi City is for individuals, and applications for the fiscal year 2026 have closed. Please check along with national and Tokyo Metropolitan projects. |
| ⑤ Loans and Interest Subsidies | Loan for renovation of common areas of condominiums from the Japan Housing Finance Agency, interest subsidies from Tokyo Metropolitan Government (subsidy for condominium improvement work). |
① Inagi City’s Condominium-Related Systems and Consultation Desk
We have organized the information that Inagi City provides for condominium management associations based on what we could confirm on the city’s official page. None of these systems directly cover the costs of large-scale repair work.
| Condominium Consultation Desk | A list of the city’s housing-related systems, providing guidance as a consultation desk for condominium transactions, management, seismic reinforcement, rebuilding, etc. The desk is the Urban Development and Regeneration Division (042-378-2111, extension 324). We could not confirm information regarding advisor dispatch or management status reporting in this list. |
|---|---|
| Actual Survey on Condominium Sales | The city conducted an actual survey in 2022 and published a summary report. The city’s page states, “Inagi City has over 200 buildings and approximately 10,500 condominium units.” (The page was last updated on December 16, 2024). |
| Support for Seismic Reinforcement | The city’s seismic assistance covers subsidies for seismic diagnosis and seismic renovation of wooden houses. The city’s seismic renovation promotion plan does not mention assistance for condominiums or collective housing. Tokyo Metropolitan Government has a subsidy for “Emergency Measures for Piloti Floors, etc., to Protect Lives,” targeting condominiums with piloti floors that are at high risk of collapse under old seismic standards (Tokyo Metropolitan Condominium Division 03-5320-4944. Please check with the Tokyo Metropolitan Government to see if you are eligible). |
*On Inagi City’s official page, there was no confirmation of city subsidies for asbestos surveys and removal work. The city has guidelines for preventing asbestos dispersion, which include informing neighboring areas and notifying the city. For notifications regarding dispersion prevention, please check with the city and Tokyo Metropolitan government at the planning stage of the construction. Since the reception status may change, please confirm the latest handling at the desk before applying.
② Condominium Longevity Promotion Tax System (Reduction of Fixed Asset Tax)
If large-scale repairs that contribute to the longevity of certain qualifying condominiums (such as exterior painting, floor waterproofing, and roof waterproofing, conducted as a single project) are carried out, the fixed asset tax amount for the building for the following fiscal year will be reduced (up to the equivalent of 100㎡ per unit; urban planning tax is not included). The reduction rate is determined by local ordinances. In Inagi City, the fixed asset tax is a city tax, and according to Inagi City’s information, the fixed asset tax amount for the house for the fiscal year following the completion of the work will be reduced by one-third (in the 23 wards of Tokyo, the fixed asset tax is a metropolitan tax, and the reduction rate is one-half).
| Main Requirements of the National System | For condominiums with more than 10 units and a floor area of the residential exclusive part that is more than half of the total exclusive area, built for over 20 years / At least one instance of exterior painting, floor waterproofing, and roof waterproofing has been completed in the past / Condominiums that have received management plan certification, which have raised the amount of repair reserve funds (average amount for the entire planning period) from below the certification standard to above the standard after September 1, 2021, or management associations that have received administrative advice and guidance based on the Condominium Management Improvement Act and have long-term repair plans that meet national standards. |
|---|---|
| Implementation Deadline of the National System | From April 1, 2023, to March 31, 2027 (the same period is indicated in the information from Inagi City) |
| Treatment by Inagi City | The reduction rate is one-third (up to the equivalent of 100㎡ per unit. The urban planning tax is not reduced). The reduction applies to the following fiscal year after the completion of the work. The declaration deadline is within 3 months after the completion of the work, and the declaration should be made to the Inagi City Hall, Citizens’ Department, Tax Division (042-378-2111). Since the floor of the window and the responsible section, as well as the submission method, are not listed on the city’s page, confirmation with the Tax Division is necessary. It is stated that this reduction does not apply in the fiscal years that are subject to reductions for seismic, barrier-free, and energy-saving renovations. |
| Main Submission Documents | For management plan certified condominiums, a copy of the management plan certification notification, a large-scale repair certificate, a past work certificate, and a repair reserve fund increase certificate are required. For condominiums that have received advice and guidance from the city, a certificate of implementation of advice and guidance, a large-scale repair certificate, and a past work certificate are required. |
| Points to Note | Obtaining management plan certification and reviewing long-term repair plans take time, so preparation is recommended at least one year before the work. The property tax reduction for seismic, barrier-free, and energy-saving renovations cannot be used in the same fiscal year. The treatment after April 2027 has not been confirmed on the official page. |
- Inagi City: Property Tax Reduction for Building Renovations (Seismic, Barrier-Free, Energy-Saving Renovations, Large-Scale Repairs of Condominiums) (Official)
- Ministry of Land, Infrastructure, Transport and Tourism: Tax System for Promoting Long Lifespan of Condominiums (Official)
- Ministry of Land, Infrastructure, Transport and Tourism: Property Tax Reduction for Large-Scale Repairs of Condominiums (PDF)
- Ministry of Land, Infrastructure, Transport and Tourism: Is Your Condominium Being Regularly Repaired? (PDF)
③ Management Plan Certification System (Entry for Tax and Interest Rate Benefits)
By obtaining certification, it leads to fulfilling one of the requirements for interest rate benefits on loans and bonds from the Japan Housing Finance Agency, as well as the long-term durability promotion tax system (certification alone does not guarantee tax reduction). In Inagi City, condominiums are certified through the Inagi City certification window, which has been implemented since April 2023. There are no additional criteria unique to the city, and the certification standards follow the guidelines set by the Ministry of Land, Infrastructure, Transport and Tourism. The main criteria include holding meetings at least once a year, establishing management regulations, separating accounting for management fees and repair reserves, and “creating and reviewing a long-term repair plan that includes large-scale repair work at least twice and has a planning period of over 30 years within 7 years”.
| Application Process | ① Obtain a preliminary confirmation from a condominium management consultant through the Public Interest Incorporated Foundation Condominium Management Center’s “Management Plan Certification Procedure Support Service” and receive a preliminary confirmation compliance certificate → ② Obtain a resolution from the management association general meeting and apply for certification to the city through the procedure support system → ③ Pay the fee using the payment notice sent by the city → ④ After examination, a certification notification will be mailed if it meets the standards. For change certifications, apply directly to the city without using the support service. |
|---|---|
| Fees | The city’s fees for certification and renewal are a basic fee of 4,100 yen, and if there are multiple long-term repair plans, an additional 1,800 yen will be charged for each plan after the second. Please check the Condominium Management Center’s guide for service usage fees such as preliminary confirmation. |
| Number of Certifications | The list of certified condominiums on the city’s page includes 5 entries (the page was last updated on March 30, 2026). |
| Consultation Desk | Inagi City Urban Construction Department City Development and Regeneration Division 042-378-2111 (Extension 324) |
④ National Energy Saving Support | Housing Energy Saving 2026 Campaign
Changes for Fiscal Year 2026The “Child-Rearing Green Housing Support Project” for fiscal year 2025 has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Additionally, the “Long-Term Excellent Housing Renovation Promotion Project” will end in fiscal year 2026 and will not be implemented in fiscal year 2027. Please be careful not to establish financial plans based on outdated information.
Mirai Eco Housing 2026 Project
| Target | Renovations of existing homes built before December 31, 2016, regardless of whether they are single-family or multi-family residences. Management associations and management corporations can also become joint contractors (i.e., can be used for common area renovations). Rental properties are also eligible. |
|---|---|
| Required Work | Insulation upgrades for openings, insulation upgrades for the structure (floor, walls, ceiling), and installation of eco-friendly housing equipment are mandatory combinations. |
| Subsidy Limit | Depending on the age of the building and the energy-saving performance achieved, 400,000 to 1,000,000 yen per unit (1,000,000 yen for homes built before 1991 that meet the mandatory standards). |
| Period | Work must commence after signing a construction contract, between November 28, 2025, and no later than December 31, 2026. The application for the subsidy will generally be made by the registered contractor (construction contractor) after the work is completed (the client cannot apply themselves). Reservations for subsidy applications must be made by November 16, 2026, and applications must be submitted by December 31, 2026, at the latest (will end once the budget limit is reached). |
Advanced Window Renovation 2026 Project
| Target | Renovations to existing homes (single-family and multi-family) including the installation of interior windows, replacement of exterior windows, and glass replacement to high-performance insulation windows. Subsidy rates are set separately for “low-rise” and “mid-to-high-rise” multi-family residences. |
|---|---|
| Bulk Application for Multi-Family Residences | For multi-family residences, there is a method called “bulk application” where applications for all units can be submitted together. The application process is handled by registered contractors (window renovation contractors), and management associations cannot apply themselves, but this system is well-suited for window and entrance door renovations in conjunction with large-scale repairs. |
| Subsidy Limit | For residential properties, 1,000,000 yen per unit (changed from 2,000,000 yen in fiscal 2025). For non-residential properties over 240 square meters, the limit is 10,000,000 yen per building. |
| Period | Work that commences after November 28, 2025, and no later than December 31, 2026, is eligible. Applications for the subsidy will be made after the completion and handover of the work, with reservations due by November 16, 2026, and applications due by December 31, 2026, at the latest (will end once the budget limit is reached). |
⑤ Subsidies and Grants from Tokyo and Inagi City
| Tokyo Energy Conservation Renovation Promotion Project for Existing Homes (Reiwa Year 8) | The renovation of high thermal insulation windows, doors, insulation materials, and bathtubs is eligible, and the target group includes management associations of condominium buildings. For management associations with 50 or more renovated units, the subsidy amount will be 120% of the total unit price. The maximum subsidy for windows and doors is 2 million yen per unit, and for insulation materials, it is one-third of the expenses up to 1 million yen per unit. Pre-registration started on May 29, Reiwa Year 8. Contracts and construction will take place after the pre-registration is accepted. It was not confirmed on the official page whether construction in common areas is eligible. Please check the official page and contact (03-6737-5300) for conditions regarding registered businesses and budget status. |
|---|---|
| Inagi City Carbon Neutral Housing Equipment Subsidy (Reiwa Year 8) | The target is individuals who have introduced eligible equipment into homes within the city, and there is no mention of condominium buildings or management associations. “Insulation renovation of existing windows and doors” is subsidized at one-sixth of the installation cost (up to 50,000 yen), and only existing homes are eligible. Applications were closed at 5 PM on October 14, Reiwa Year 8, as the total application amount reached the budget limit, and it is undecided whether it will resume within the fiscal year or be implemented in Reiwa Year 9 and beyond (updated on October 15, 2026). The contact point is the Green and Environment Division (042-378-2111). |
| Inagi City Asbestos Measures | According to the city’s guidelines, there are instructions for notifying neighbors and reporting to the city regarding the demolition of buildings using sprayed asbestos or asbestos-containing molded boards. No city subsidies for investigations or removal work were confirmed. The contact point is the Living Environment Division. |
| Tokyo Emergency Measures Subsidy for Piloti Floors to Protect Lives | This targets condominiums built under old seismic standards that have piloti floors with a high risk of collapse, and part of the reinforcement costs will be subsidized. The contact point is the Tokyo Metropolitan Government Housing Policy Headquarters, Private Housing Department, Condominium Division, Seismic Reinforcement Section (03-5320-4944). Please check the Tokyo page for detailed requirements and application status. |
| Tokyo Rental Housing Insulation and Renewable Energy Promotion Project (Reiwa Year 8) | This targets owners of existing rental housing under ordinary rental contracts, and construction by registered contractors of Cool Net Tokyo is required. Pre-registration is from May 29, Reiwa Year 8 to March 31, Reiwa Year 9, and will end when the total application amount reaches the limit. The subsidy rate is two-thirds, with a maximum of 300,000 yen per unit for high thermal insulation windows and 600,000 yen per unit for insulation renovations. No mention was found regarding management associations of condominium buildings, and this project is aimed at owners of rental apartments and rental condominiums. |
| Tokyo Subsidy for Renovation Costs of Special Nursing Homes (Reiwa Year 8) | This is a Tokyo project to support renovations of elderly facilities. It cannot be used for large-scale repairs of condominiums or apartments and is aimed at those who own and operate facilities such as special nursing homes. Please check the Tokyo explanation video and official page for eligibility and conditions. |
* The Tokyo rental housing project is aimed at owners of rental apartments and rental condominiums, and no mention was found regarding management associations of condominium buildings. The application status may change, so please be sure to check the official page before applying.
- Inagi City: Reiwa 8 Carbon Neutral Housing Equipment Subsidy (Official)
- Tokyo Metropolitan Government: Energy-Saving Renovation Promotion Project for Existing Homes (Official)
- Tokyo Metropolitan Government: Subsidy for Emergency Measures for Piloti Floors to Protect Lives (Official)
- Tokyo Metropolitan Government: Insulation and Renewable Energy Promotion Project for Rental Housing (Official)
- Tokyo Metropolitan Government: Announcement of the Start of the Insulation and Renewable Energy Promotion Project for Rental Housing (Official)
- Tokyo Metropolitan Government: Explanation Video on Subsidies for Renovation Costs of Special Nursing Homes
⑥ Loan System (Housing Finance Agency Mansion Sumairu Loan)
If the management association borrows funds for large-scale repairs, it can utilize the Housing Finance Agency’s “Mansion Common Area Renovation Loan (Mansion Sumairu Loan).”
| Eligible Work | Large-scale repairs, seismic retrofitting, flood prevention measures, energy-saving measures, balcony repairs, safety measures for elevators and parking lots, asbestos measures, diagnosis and design costs by specialists |
|---|---|
| Collateral | No collateral required (joint guarantee by the condominium management center, etc.) |
| Repayment Period | Generally 1 to 10 years, 1 to 20 years for specific works, up to 35 years if seismic, flood, and energy-saving works are carried out after obtaining management plan certification |
| Interest Rate Reduction | ① Holding of Sumairu Bonds ② Obtaining management plan certification ③ Implementation of seismic, flood, and energy-saving works, each reducing by 0.2% per year (up to 0.6% per year) |
| Main Requirements | Improvement of management regulations, resolution at the general meeting, the delinquency rate of repair reserve funds must be within 10%. Applications are accepted year-round |
Source: Housing Finance Agency “Mansion Sumairu Loan” (Official)
Tokyo Metropolitan Apartment Improvement Construction Subsidy (Interest Subsidy)
| Content | This is a system where the Tokyo Metropolitan Government subsidizes the interest on the “Apartment Common Area Renovation Loan” from the Japan Housing Finance Agency. The subsidy covers the difference between the interest rate from the Agency and 1% lower rate (if the interest rate is below 1%, it effectively becomes 0%), and the subsidy period is up to 20 years, which is the repayment period of the loan. |
|---|---|
| Eligibility | This applies to management associations of fire-resistant condominium buildings in Tokyo that utilize the Agency’s loans and debt guarantees from the Apartment Management Center, etc. The subsidy is for repairs and renovations of common areas (installation work for solar power generation equipment may also be eligible for the loan; please confirm the conditions with the Japan Housing Finance Agency). For condominiums built before the earthquake resistance standards (before May 31, 1981), conducting an earthquake resistance diagnosis is a requirement, and for condominiums that need to report their management status, it is a condition that the report and updates have been completed. |
| Limit | The limit is the smallest amount among the loan reservation amount, the construction cost eligible for the loan, the amount after deducting subsidies from the construction cost, and 2 million yen per unit (6 million yen if it involves earthquake reinforcement) multiplied by the number of units. |
| Application for Reiwa Year 8 | Applications are accepted in two phases; the first phase (from May 13 to September 30) has ended. The second phase is from October 1, 2026, to February 19, 2027. There are 2,500 units available for each phase, on a first-come, first-served basis. After loan approval, applications and grant decisions must be received before the monetary loan agreement. Contact: Tokyo Metropolitan Housing Policy Headquarters, Private Housing Department, Apartment Division 03-5320-7532 |
Cases Where Fire Insurance Can Be Used and Cases Where It Should Not Be Used
Damage caused by “accidental incidents” such as flying waterproof sheets, caps, and fences due to typhoons or strong winds, hail damage, and lightning strikes may be covered by fire insurance. It is important to separate and record damage caused by accidents from normal wear and tear during deterioration diagnosis.
On the other hand, normal wear and tear itself is not covered. There have been many troubles nationwide with companies soliciting that “repairs can be made without out-of-pocket expenses with insurance money,” and the National Consumer Affairs Center has repeatedly issued warnings. False claims may be prosecuted as insurance fraud. Please confirm the eligibility of claims directly with your management association or property owner to the insurance company or agency. Kakeru Koumuten Co., Ltd. does not provide such guidance.
Building Conditions and Repair Points in Inagi City, Tokyo
Inagi City is a city with a population of approximately 95,000 and an area of 17.97 km², featuring residential areas in the Koyodai, Nagamine, and Wakabadai neighborhoods of the Tama New Town, as well as hilly regions and established urban areas. According to the city’s seismic retrofitting promotion plan (based on the Reiwa 5 Housing and Land Statistics Survey), out of 41,457 residential units, 27,363 are condominiums, accounting for about two-thirds (66.0% according to our calculations). The city’s condominium survey (Reiwa 4) revealed that the most common age of condominiums is 21 to 30 years, with 27 out of 36 buildings built to old seismic standards located in Hirao’s condominium developments. The numbers below are only those confirmed from official documents.
(as of October 1, Reiwa 8)
(as of October 1, Reiwa 8)
(estimated based on Reiwa 5 housing survey, calculated by us)
(city’s survey, Reiwa 4)
(17.2% of the 209 buildings surveyed)
Source: Inagi City “Latest Population and Household Numbers” / Inagi City “Inagi City Seismic Retrofitting Promotion Plan” (PDF) / Inagi City “Inagi City Condominium Survey Report [Summary Version]” (PDF) / Inagi City “Statistical Report (Reiwa 4 Edition)” (PDF) ※The proportion of condominiums is calculated by us from the number of residential units in the plan (27,363 condominiums ÷ total 41,457 units). The area is as stated in the statistical report.
The majority of condominiums in Inagi City are 21 to 30 years old, with old seismic buildings concentrated in Hirao
According to the city’s survey (Reiwa 4, with 105 associations and 209 buildings surveyed), the number of buildings by age shows that the most common age group is 21 to 30 years, with 83 buildings (39.7%). Four years have passed since the survey, and the ages have advanced by four years each. The city estimates that the number of condominiums over 30 years old will increase from approximately 2,700 units (Reiwa 4) to about 6,200 units in ten years. The table below replaces the classification at the time of the survey with an estimate of the age as of 2026.
| Age of Construction (as of the survey in Reiwa 4) | Number of Buildings (209 buildings) | Estimated Age of Construction (as of 2026) | Major Repairs in the Next Renovation |
|---|---|---|---|
| 31 years or older 31-40 years: 31 buildings, 41-50 years: 11 buildings, 50 years or more: 27 buildings |
69 buildings (33.0%) | 35 years or older | Repairs after the 3rd time. Replacement of water supply and drainage pipes, replacement of iron parts and handrails, seismic diagnosis will be the main issues. |
| 21-30 years | 83 buildings (39.7%) | 25-34 years | 2nd to 3rd time. Replacement of waterproof layers and sealing, updating of equipment, renovation of sashes and entrance doors will be the focus, and decisions will be made by comparing the previous specifications and the degree of deterioration. |
| 11-20 years | 42 buildings (20.1%) | 15-24 years | 1st to 2nd time. Exterior wall painting, sealing, and rooftop waterproofing will be the main focus. |
| 10 years or younger | 15 buildings (7.2%) | 14 years or younger | Preparation period for the first repair. The main issues are confirming the long-term repair plan and reviewing the repair reserve fund. |
Source: Inagi City “Inagi City Condominium Actual Survey Report [Summary Version]” (PDF) (The number of buildings by age is from the same document; 69 buildings over 31 years is the total of 31-40 years, 41-50 years, and 50 years or more) *The age of construction is an estimate calculated from the cutoff year and does not indicate the degree of deterioration. Buildings completed after Reiwa 4 are not included in this survey.
Four Factors Influencing Buildings and Construction in Inagi City
Based on public documents, we have organized four characteristics that are linked to large-scale repairs. Inagi City has about two-thirds of its buildings as collective housing, with the most common being condominiums aged 21-30 years. Given the assumptions of flooding and landslide disasters that include hilly areas and rivers, as well as notifications from 33 district plans, it is essential to conduct diagnoses according to the age of construction and confirm road occupancy and notifications.
① Climate | Temperature Differences, Heat Waves, Heavy Rain
According to the Japan Meteorological Agency’s observations in Tokyo (not the observations within Inagi City), the highest annual temperatures from 2021 to 2025 (the highest daily temperature of that year) ranged from 36.8 to 38.5℃, while the lowest annual temperatures (the lowest daily temperature of that year) ranged from -3.5 to -1.0℃ (the highest in 2025 was 38.5℃ in August). The annual precipitation varied significantly, with the highest in 2021 at 2,052.5mm and the lowest in 2025 at 1,152.5mm. Due to high summer temperatures and cold winter weather, the exterior walls, sealing, and waterproof layers undergo repeated expansion and contraction every year.We recommend inspecting the waterproof layers, sealing, and drains before any issues arise.
② Topography and Flooding | Hilly Areas, Tama River, Misawa River, Landslide Hazards
On the city’s page, it is stated that the housing in the Tama New Town area is arranged along the hilly terrain in high, medium, and low-rise configurations, and the city’s landscape rules categorize the areas as “Misawa River Left Bank Hilly Area” and “Misawa River Right Bank Hilly Area.” The flood-prone areas include Tama River (total rainfall of 588mm over 48 hours), Asakawa and Oguragawa (maximum 153mm in 1 hour, total rainfall of 690mm over 24 hours), and Misawa River (maximum 152mm in 1 hour, total rainfall of 690mm over 24 hours), with internal flooding (rain exceeding the drainage capacity of sewers and waterways) based on a maximum of 153mm in 1 hour and 690mm over 24 hours. The disaster prevention map includes landslide hazard areas (yellow) and special caution areas (red), as well as a liquefaction hazard map (the number of areas and maximum flood depths are not specified in the main text of the city’s page). The city’s seismic retrofitting promotion plan anticipates a Tama Eastern Subduction Earthquake (M7.3), predicting a seismic intensity of 6+ in low-lying areas along the Tama River and 6- elsewhere. Please check the city’s disaster prevention map to see which assumptions apply to your property.
③ Types of Buildings | Approximately Two-Thirds are Multi-Family Dwellings, New Town and Hirao
According to the city’s seismic retrofitting promotion plan (based on the Reiwa 5 Housing and Land Statistics Survey), out of 41,457 residential units, there are 27,363 multi-family dwellings (24,510 non-wooden and 2,853 wooden), and 14,094 single-family homes. There are 5,981 residential units built before Showa 55, of which 4,070 are multi-family dwellings. The Tama New Town Inagi area (approximately 292ha) was designated for urban planning in 1965, with developments in Koyodai (opened in Showa 63), Nagamine (Heisei 7), and Wakabadai (Heisei 11), completing the project in March Heisei 18. On the other hand, many of the older earthquake-resistant condominiums are in Hirao, and even within the same city, the buildings in the New Town that are 20-30 years old and the older buildings in Hirao will have different heavier renovations in the next repair. It is essential for each management association to confirm the construction year and previous work details to plan accordingly.
④ City Rules | Landscape Color Guidelines, District Plans, Tokyo Metropolitan Landscape Ordinance
Inagi City is classified as “Hilly Landscape Basic Axis” or “General Area” in the Tokyo Metropolitan Landscape Plan, and certain activities above a certain scale may require notification to the Tokyo Metropolitan Government (Urban Development Bureau, Green Space and Landscape Division 03-5388-3265. The scale varies by area). According to the city’s Q&A, repainting in the same color is also subject to notification (normal maintenance activities such as tile repairs are exempt). The city has Inagi City Landscape Color Guidelines, encouraging their use during new construction, rebuilding, or repainting of walls. There are color classification targets by region (existing urban areas, Misawa River left and right bank hilly areas, Hirao area, station vicinity areas, Wakabadai Station north exit area. Mid-rise and high-rise buildings are those over 10m in height or with a total floor area of 1,000㎡ or more), and outside the district plan areas, no notification to the city is required, but cooperation is requested to refrain from using highly saturated or outstanding colors. The city’s district plans cover 33 areas (approximately 710.8ha), and within these areas, even repainting exterior walls and roofs requires notification, even if the same color is used. Notifications must be submitted 30 days before the start of construction and before the building confirmation application, and the color of the exterior walls and roofs must be recorded in Munsell values in the documents (Urban Development Planning Division 042-378-2111). The guidelines for greening and the number of building agreements could not be confirmed from the city’s page. Please check with the relevant office for each property.
Source: Japan Meteorological Agency “Past Weather Data (Tokyo)” / Inagi City “Inagi City Earthquake Resistance Improvement Promotion Plan” (PDF) / Inagi City “Inagi City Condominium Actual Condition Survey Report [Summary Version]” (PDF) / Inagi City “Tama New Town Area” / Inagi City “Flooding Assumed Areas” / Inagi City “Web Version Disaster Prevention Map / Hazard Map” / Inagi City “Notification Regarding Landscape” / Inagi City “Inagi City Landscape Color Guidelines” / Inagi City “Notification of District Planning” / Inagi City “List of District Planning Locations and Planning Documents” / Tokyo Metropolitan Government “Landscape Ordinance Q&A” (PDF)
Key Points to Consider When Advancing Construction in Inagi City
| Issue | Current Situation in Inagi City and Kakeru Koumuten’s Response |
|---|---|
| Road Occupation and Delivery | If scaffolding or temporary enclosures extend onto public roads, a road occupation permit is required. In Inagi City, the Urban Construction Department’s Management Division is the point of contact, and you must submit an application form, scaffolding and temporary enclosure agreements (3 copies), and attached documents such as drawings (4 copies). The agreement must also be submitted to the Tamachi Central Police Station for their input. It takes about one week from submission to the city, and the police station typically returns it in about two business days. After approval, a payment slip for the occupation fee will be issued, and submission of the construction commencement notification and construction completion notification is necessary. The amount of the occupation fee is not listed on the city’s page. We will confirm the front road and delivery route on-site and incorporate the need for occupation and the schedule of procedures into the project timeline. |
| District Planning and Landscape Color | In areas subject to district planning, even repainting the exterior walls and roofs in the same color requires notification, which must be submitted at least 30 days before the start of construction. Even outside the designated area, cooperation is requested to refrain from using highly saturated or prominent colors according to the city’s landscape color guidelines. Notification under the Tokyo Metropolitan Landscape Ordinance may also be required. We will confirm whether this applies before starting construction and incorporate it into the project timeline if necessary. |
| Old Seismic Buildings and Seismic Diagnosis | There are 36 old seismic buildings in the city, of which 27 are condominiums in Hiraoka. The city’s seismic assistance is targeted at wooden houses, and there is no mention of city assistance for seismic diagnosis or renovation of condominiums in the plan. During the planning stage of large-scale repairs, we will organize the necessity of seismic diagnosis and propose a combination of work that can be done while scaffolding is in place. |
| Window Insulation and Subsidies | The city’s carbon-neutral housing equipment subsidies are for individuals, and applications for the fiscal year 2026 closed on October 14. If window renovations are included in large-scale repairs, we will check whether national advanced window renovation programs for 2026 or Tokyo Metropolitan projects can be utilized, confirming each system before signing the contract and organizing the schedule based on the general meeting timeline. |
| Flooding and Landslide Disaster Assumptions in Hilly Areas and Drainage | There are assumptions regarding flooding in the Tamagawa, Asakawa, Oguragawa, and Misawagawa rivers, and the disaster prevention map also displays landslide disaster warning areas. We will organize the diagnosis of roof drains, gutters, and drainage pipe blockages, as well as how water enters low floors and basements. |
| Reserve Funds and Long-Term Repair Plans | According to a city survey, 15 out of 45 responding associations indicated that their repair reserve funds were “insufficient.” We will organize the review of long-term repair plans and prioritize the scope of this construction based on the results of the diagnosis. |
Source: Inagi City “Road Occupation”／Inagi City “Road Occupation Permit Application Procedure” (PDF)／Inagi City “District Planning Notification”／Inagi City “Inagi City Landscape Color Guidelines”／Inagi City “Inagi City Condominium Actual Condition Survey Report [Summary Version]” (PDF)／Inagi City “Carbon Neutral Housing Equipment Subsidy”／Tokyo Metropolitan Government “Landscape Ordinance Q&A” (PDF)
* We accept consultations throughout Inagi City.
Deterioration Symptoms and Timing Requiring Major Repairs
Generally, major repairs are estimated to occur in a 12 to 15-year cycle. According to the Ministry of Land, Infrastructure, Transport and Tourism’s actual condition survey, the actual repair cycle is most commonly 13 years, with about 70% falling within the 12 to 15-year range, and the cycle tends to shorten with each occurrence. However, the actual judgment should be based on the deterioration condition rather than the number of years, so if you observe symptoms like those below, we recommend an early on-site survey.
| Part | Dangerous Signs of Deterioration if Left Untreated | Main Actions |
|---|---|---|
| Exterior Wall (Painted Surface) | Chalking (white powder on hands), fading, cracks over 0.3mm, blistering or peeling of paint | Substrate repair + exterior wall painting |
| Exterior Wall (Tile Surface) | Tile lifting or falling off, joint chipping, efflorescence, hollow sound when tapped | Injection for lifting, replacement, clear waterproofing |
| Sealing | Cracks in joints, shrinkage, peeling, hardening | Re-sealing |
| Roof and Balcony | Bloating or breaking of waterproof layer, puddles, clogged drains, leaks to lower floors | Urethane waterproofing, sheet waterproofing, drain renovation |
| Metal Parts and Steel Stairs | Rust, peeling paint, corrosion of treads | Grinding + rust prevention + painting, component replacement |
| Roof | Lifting of ridge cap, cracking or warping of slate, moss, shifting of tiles | Roof painting, overlay method, re-roofing |
| Concrete | Spalling (exposed rebar with rust stains), water leakage from cracks | Spalling repair + resin mortar filling |
| Common Hallway and Stair Floor | Lifting, peeling, or opening at the edges of long sheets, exposure of substrate | Replacement of long sheets + substrate waterproofing |
Repair Cycle Guidelines by Part (Ministry of Land, Infrastructure, Transport and Tourism Guidelines)
| Part/Work | Estimated Cycle | Part/Work | Estimated Cycle |
|---|---|---|---|
| Exterior Wall Painting (Repainting) | 12-15 years | Re-sealing | 12-15 years |
| Exterior Wall Painting (Existing Removal + Painting) | 24-30 years | Metal Part Painting | 5-7 years |
| Roof Waterproofing (Repair) | 12-15 years | Water Supply Pipe (Rehabilitation/Replacement) | 19-23 years / 30-40 years |
| Roof Waterproofing (Removal/New Installation) | 24-30 years | Drain Pipe (Rehabilitation/Replacement) | 19-23 years / 30-40 years |
*The above are reference examples from the guidelines and are not uniform construction deadlines. Actual cycles will be set according to the specifications, location conditions, and deterioration status of the building.
Source: Ministry of Land, Infrastructure, Transport and Tourism “Long-term Repair Plan Creation Guidelines” (Revised June 2024, PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Fiscal Year 2021 Survey on Large-scale Repair Works for Condominiums”
Examples of Large-Scale Renovation Work
This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten. The building had leaks occurring in several places, and we combined clear waterproofing of the tile exterior wall with rooftop waterproofing for the renovation.
Exterior Renovation Work for Mixed-Use Building (Tile Wall Waterproofing + Roof Waterproofing)
| Work Details | Partial tile replacement for damaged tiles / Painting of ancillary parts (pipes, water drainage) / Roof waterproofing work (urethane waterproofing) / Exterior wall tile waterproofing (Seven S) / Sealing work around windows / Repair of mortar joints for exterior wall tiles / Removal of ivy |
|---|---|
| New Materials Used | Exterior wall tiles: Kunishiro Tiles / Painting of ancillary parts: Radical silicone paint / Roof waterproofing: High-strength urethane (Sarasene A) / Exterior wall tile waterproofing: Seven S |
| Price Range | 4,000,000 to 4,100,000 yen |
| Construction Period | 45 days |
| Location | Not disclosed |
| Background to the Work | Due to leaks occurring from several areas including the exterior wall and roof, we proposed waterproofing for the entire exterior wall. Seven S is a clear waterproofing material for tile walls, which is slightly more expensive but highly waterproof, making it recommended for cases where leaks are occurring from several points on the exterior wall. |
Customer Feedback
Flow from On-Site Investigation to Completion of Work
From the initial inquiry to the completion of the work and aftercare, a single representative will consistently handle your case. For management associations, a resolution at the general meeting is required, so it is advisable to start the process 1 to 1.5 years before the desired start date to proceed with ample time.
- Inquiry (Free) Please contact us via phone, form, or LINE. If you have estimates from other companies, just presenting those is fine.
- On-site Investigation & Building Diagnosis (Free) We will conduct an exterior wall inspection, check for cracks, sealing, and waterproofing layers, and if necessary, investigate the rooftop, high places, and leak areas using drones or thermal imaging. For properties in Inagi City, we will also check the site conditions, trees, road width, necessity of road occupation, distance from neighboring buildings, flooding assumptions for the Tamagawa, Asakawa, Oguragawa, and Misawagawa rivers, landslide warning areas, internal water assumptions, and delivery routes and parking.
- Submission of Investigation Report & Estimate We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. Multiple plans can also be proposed.
- Plan Decision & Contract Confirm colors using color simulations, paint boards, and trial painting. For management associations, we will assist in preparing materials for the general meeting. If the Tokyo Metropolitan Landscape Ordinance, Inagi City Landscape Color Guidelines, or district plans apply, we will also explain the color considerations.
- Notification to Residents & Neighbors We will distribute construction notifications, visit neighbors for greetings, and set up a bulletin board at the entrance (construction schedule and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
- Temporary Scaffold Installation to Various Works Our in-house scaffold team will set up scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting and tile repair → waterproofing → iron and ancillary parts in that order. A supervisor will inspect and take construction photos for each stage.
- Completion Inspection, Scaffold Dismantling, and Handover We will confirm the finish in the presence of the customer and provide construction photos, a report on the paint used, and a warranty.
- Aftercare We will send out annual DM notifications, allowing for yearly inspections. Simple repairs like partial sealing are provided free of charge.
Resident Communication, Additional Work Approval, and Inspection Reports
Equally important as the construction itself is “when, what, and with what materials we report”. At Kakeru Koumuten, we provide materials and reports in the following four scenarios.
| Scenario | Materials Provided / Actions Taken |
|---|---|
| Before Construction Building Diagnosis |
We will provide a deterioration diagnosis report with photos. This document summarizes the deterioration areas and the basis for the proposed scope of work. |
| Before Construction to During Construction Notification to Residents & Neighbors |
We will distribute construction notifications, visit neighbors for greetings, and provide information on the construction schedule and laundry via the entrance bulletin board. |
| During Construction Approval for Additional Work |
Deterioration discovered after scaffolding is set up will be addressed by presenting photos, quantities, and costs for approval before proceeding with the work. |
| During Construction to Completion Inspection Report |
A supervisor will inspect each stage and take construction photos. At completion, we will confirm the finish in the presence of the customer and provide construction photos, a report on the paint used, and a warranty. |
* For management associations, it is smooth to decide in advance who will approve additional work (such as the chairman or repair committee) and the approximate amount that will require approval before signing the contract.
How will life be during construction? Impact on residents
Large-scale repairs are principally carried out while residents remain in their homes. However, there will be limitations on daily life while scaffolding is in place. Most troubles can be prevented simply by providing prior notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction begins.
| What will be affected | What will actually happen / Our response |
|---|---|
| Laundry | On days of high-pressure washing, painting, and waterproofing, outdoor drying will not be possible. We will inform you via bulletin board and each unit’s mailbox about “which side will be worked on today” and will secure as many days as possible for drying. |
| Window opening and closing | In addition to washing and painting days, there may be times when windows cannot be opened during processes such as protection, drying, and waterproofing. We will inform you for each process, so please check the postings and notifications. We will schedule the work to avoid consecutive closures. |
| Balcony | During floor waterproofing and handrail painting, we ask for temporary relocation of personal items, plants, and air conditioning outdoor units. The timing will be notified in advance for each unit. |
| Noise and odor | The period of substrate repair (chipping and drilling) will generate the most noise. Work hours are generally from 8 AM to 5 PM, and we will accommodate requests such as refraining from work on Sundays and holidays. Low-odor paint options are also available. |
| Security and privacy | Scaffolding can become a potential entry point. We can take measures such as blocking sightlines with mesh sheets and installing locks and sensor lights on the scaffolding’s access stairs at night. We also thoroughly educate visitors on proper etiquette. |
| Parking | Vehicles on the side where scaffolding will be erected will need to be temporarily relocated. Since securing a new parking spot may take time, we will start securing a new location together 2 to 3 months before construction begins. |
| Pets, small children, and working from home | If you have sensitivities to noise, please inform us in advance, and we may be able to accommodate adjustments to the work schedule. Please feel free to let us know. |
| Rented rooms | We can assist owners in creating notification documents for residents. If you are concerned about the impact of construction on occupancy rates, we can also suggest a color simulation for an image change. |
How to choose a large-scale repair contractor and ordering method
There are many large-scale repair contractors that cover Inagi City, Tokyo, and you may be unsure which one to choose. When requesting renovations for apartments, condominiums, or buildings, please check the following four points.
● Have extensive experience in large-scale repairs
● Confirm the existence of warranties and aftercare services
● Obtain estimates from multiple contractors (at least three)
● Confirm whether they are self-managed
Have extensive experience in large-scale repairs
Large-scale repair contractors often have websites that showcase their exterior renovation achievements. If they provide detailed explanations of repair work with photos, it gives peace of mind as it can serve as a reference when you actually request work.
Using ratings from Google and review sites can be effective when comparing large-scale renovation contractors! Be cautious if there are many negative reviews. If there are few reviews, also check the construction track record, the content of the explanations, and the management system.
Large-scale renovation work involves not only the construction itself but also the potential for troubles with residents and nearby neighbors. Therefore, it is necessary to post updates on the progress of the work and information about laundry on bulletin boards to prevent issues before they arise. Kakeru Koumuten Co., Ltd. specializes in exterior work, so we receive many requests for exterior renovations of apartments and condominiums.
Check for warranties and aftercare services
When choosing a large-scale renovation company, make sure to check for warranties. If any issues such as leaks occur after the construction, having a leak warranty from the contractor means you can get repairs done for free, providing peace of mind! Companies that offer warranty periods can be seen as having confidence in their work, which can serve as a criterion for selecting a contractor.
Warranty periods vary by contractor and the nature of the work, but typically range from 1 to 10 years. Emergency repairs or partial fixes often do not come with a leak warranty. Some contractors also provide aftercare services separate from warranties, so be sure to check for warranties and aftercare services.
At Kakeru Koumuten Co., Ltd., we send out annual direct mail for aftercare maintenance, allowing for yearly inspections. We also provide free responses for simple repairs such as partial sealing.
Obtain estimates from multiple contractors (at least 3 companies)
When requesting large-scale renovations, be sure to obtain estimates from multiple contractors. It is important to get estimates from at least three companies and compare their estimates and reports! Even for the same work, costs can vary by contractor, and warranties and aftercare services may differ. Additionally, obtaining multiple estimates makes price negotiations easier.
When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repairs and exterior wall painting,” and “confirmation of the process.” Be thorough in your comparisons! If the quality of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work can be difficult to assess from appearance alone, be sure to check whether the repair method is appropriate for the condition of the substrate!
Check these points on the estimate (checklist)
| Confirmation Items | Points to Consider |
|---|---|
| Is there an excessive use of “one set” notation? | Are the quantities and unit prices clearly stated? With “Exterior Wall Repair One Set,” comparisons and verifications cannot be made. |
| Do the quantities match the actual measurements? | Are there quantities recorded that are far from the drawings or actual measurements? This is the area where inflation is most likely to occur. |
| Proportion of miscellaneous expenses | Details and proportions of site management costs, general management costs, statutory welfare costs, etc. According to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, the average is about 10% of the construction cost (excluding common temporary costs), but it varies depending on the scale and conditions of the building, so there is no uniform standard. |
| Are the names of materials written? | Are the manufacturer names, product names, grades, and number of coats for paints and waterproofing materials listed? |
| Treatment of quantities for substrate repairs | This is an item that cannot be accurately measured until scaffolding is set up. Is it stated whether it is “estimated quantity” or “actual quantity settlement,” and are there agreements for increases or decreases? This is the most important point. |
| Guarantee and after-inspection | Warranty period for each construction, frequency of inspections, and scope of free support. |
| Company backing | Types of construction industry licenses, track record of similar scale and structure, presence of qualified personnel. |
Confirm if it is managed in-house
Large-scale repair work includes various tasks such as “substrate repair work,” “exterior wall painting,” “waterproofing work,” and “pipe replacement,” and the plan content will change based on the actual deterioration condition and customer preferences.
In cases where a contractor completely outsources to subcontractors, they may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or unnecessary work. If you investigate and then request a subcontractor, it may incur additional time and costs. By having knowledge and experience and managing in-house, responsible construction can be performed at a reduced cost.
Additionally, contractors that outsource may also be slow to respond in the event of trouble during construction. It is safer to avoid having a company that has not actually met with the customer manage the construction. Kakeru Koumuten performs everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, with knowledgeable and experienced personnel managing the construction!
There are three ordering methods. The choice affects how the process proceeds.
Especially for management associations, before deciding “which company to hire,” it is necessary to determine “how to make the request.” The main ordering methods are the following three.
| Method | Procedure | Advantages | Disadvantages |
|---|---|---|---|
| Responsible Construction Method | The construction company handles investigation, design, construction, and management all at once | No additional costs for commissioning design consultants (investigation and design costs may be included in the construction costs) / A single point of contact reduces the burden on the management association / Responsibility is clear / The period until ordering can sometimes be shortened | Specifications can easily be left to the construction company, making it difficult to compare side by side / Third-party checks are hard to implement, requiring the management association to verify price, specifications, and construction status |
| Design Supervision Method | A design office or consultant conducts investigation and design, while construction is handled by a separate company | Allows comparison of construction companies under the same conditions / Independent supervision during construction | Consulting fees are required separately / Attention is needed for risks of conflicts of interest and collusion / The period can easily become prolonged |
| Management Company Prime Contract Method | The management company acts as the prime contractor, with subcontractors performing the construction | Easy coordination with daily management / Minimal effort required from the management association | Intermediate margins can make it more expensive / Competition principles may not be effectively applied |
Collusion and Inappropriate Consulting Issues in Large-Scale Renovations and Self-Defense Measures
Latest 2026 In the large-scale renovation industry, inappropriate orders linked between design consultants and construction companies have long been a concern. The Ministry of Land, Infrastructure, Transport and Tourism issued warnings and notifications to management associations in January 2017 and April 2023, and on September 28, 2026, the Japan Fair Trade Commission announced that it had issued exclusion orders to 38 companies and imposed a total of 1.63788 billion yen in surcharge payment orders to 37 companies regarding large-scale renovation work commissioned by condominium management associations to design consulting firms in the Kanto region (two design consulting firms were also subject to exclusion orders).
※Based on the announcement by the Japan Fair Trade Commission (September 28, 2026).
Three Typical Methods
① Dummy Estimates
Prior to placing an order, companies decide on a contractor, while other companies only provide a formal high estimate, creating a “prearranged race.” This gives the impression to the management association that they have “properly obtained competitive estimates.”
② Collusion with Design Supervisors
Consultants contract at extremely low design supervision fees while receiving kickbacks from the high construction costs of affiliated contractors. Be cautious of design supervision fees that are too low.
③ Back Margin
A certain percentage of the contract amount is kicked back, which is then added to the construction costs as expenses. As a result, the management association ends up paying extra.
Self-Defense Measures for Management Associations
- Obtain independent estimates from multiple companies
- Consult with neutral third parties such as condominium management professionals or architects
- Document the contractor selection process in minutes to ensure transparency
- Confirm the reasons for unusually low consulting fees
- Include a penalty clause in the contract for cases of collusion
- Avoid concentrating information with a single consultant and verify specifications independently
Frequently Asked Questions about Large-Scale Renovations in Inagi City, Tokyo
- How much does a large-scale renovation in Inagi City, Tokyo cost?
- For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey, about 70% of cases fall within the range of 750,000 to 1,500,000 yen (excluding consumption tax and common temporary costs), with the most common range being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, the estimated costs are 2,000,000 to 4,000,000 yen for wooden two-story apartments, 4,000,000 to 9,000,000 yen for three-story steel and RC apartments, and 5,000,000 to 15,000,000 yen for small condominiums and mixed-use buildings. The costs vary depending on the condition of the substrate and whether waterproofing and roofing work are required, so we provide free on-site estimates.
- How often should large-scale renovations be conducted?
- Generally, a cycle of 12 to 15 years is recommended, and the actual cycle is most commonly 13 years according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, with about 70% falling within the 12 to 15-year range. However, the decision should be based on the condition of deterioration rather than just the number of years. If signs of deterioration such as sealing degradation, tile lifting, or waterproof layer breakage are observed, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. In Inagi City, according to the city’s condominium survey (fiscal year 2022, report published in March 2023), among the 209 surveyed buildings, 83 (39.7%) were built 21 to 30 years ago, and 36 (17.2%) were built under old seismic standards, with 27 of those being in the Hirao area. The building ages are based on the survey date, and since four years have passed since the survey, the current ages are approximately four years older. Buildings that have aged further may be entering their second or third round of repairs, and updates to plumbing and equipment are likely to become points of discussion. However, the survey is based on responses to questionnaires, and the current conditions vary by building.
- How long does the construction period take? Can residents stay during the work?
- The estimated time is 3 weeks to 2 months for apartments, 1.5 to 3 months for small condominiums and buildings, and about 4 to 6 months for condominiums with over 50 units. Residents can remain in their homes during the construction. However, while scaffolding is in place, there may be restrictions on drying laundry outside and opening windows, so we take thorough measures to minimize the impact on daily life, including distributing notices before construction, providing information on the schedule and laundry through bulletin boards, and strictly adhering to working hours.
- How long should we expect from the start of planning to the completion of construction?
- For management associations, it typically takes about 1 to 1.5 years for the establishment of the repair committee, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed with ample time. If subsidies or tax incentives are to be used, obtaining management plan certification (resolutions at general meetings, prior confirmation, certification application) will also take time, so please factor that into your timeline.
- Are there any subsidies available for large-scale renovations in Inagi City, Tokyo?
- As of October 15, 2026, there were no city programs found that directly subsidize the construction costs or deterioration diagnosis costs for large-scale renovations of condominiums (please confirm with the city’s Urban Development Department, Community Development and Regeneration Division). The city provides information on the management plan certification system and consultation services, and the city’s seismic assistance is targeted at wooden houses. For large-scale renovations, if the condominium meets the requirements, there are options such as property tax reductions under the “Condominium Longevity Promotion Tax System” (Inagi City applies a reduction of one-third on city taxes; urban planning tax is not reduced) and loans from the Japan Housing Finance Agency, as well as the Tokyo Metropolitan Government’s “Condominium Improvement Work Subsidy” (interest subsidies; applications for the second phase of fiscal year 2026 are accepted until February 19, 2027). Management plan certification inquiries can be directed to Inagi City (Community Development and Regeneration Division 042-378-2111). The city’s “CN Housing Equipment Subsidy” is an individual program that closed applications at 5 PM on October 14, 2026 (as of October 15, 2026). Additionally, for construction that includes windows and insulation, there may be eligibility for national programs such as “Advanced Window Renovation 2026,” “Mirai Eco Housing 2026,” and Tokyo’s energy-saving renovation promotion project for existing homes. The application timing and applicants vary by program, so please check the eligibility conditions and application procedures for each program before contracting and starting construction.
- I heard that property taxes can be reduced with large-scale renovations. Is that true?
- 外壁の色は自由に決められます。お客様のご希望に応じて、様々な色やデザインから選ぶことができます。色見本を用意しており、実際の施工前に確認していただけますので、安心してお選びいただけます。色の選定は、建物の印象を大きく左右しますので、じっくりとご検討ください。Yes, we can provide emergency repairs for leaks. Please contact us for more details. We will assess the situation and offer a solution tailored to your needs.Yes. As a preliminary step before large-scale repairs, we also accept requests for emergency measures and partial repairs for leaks. We will identify the cause using thermography and drones, and propose the minimum necessary repairs.
- Can you handle roofing and exterior materials that contain asbestos?
- Yes, we can. We have qualified personnel such as asbestos work supervisors and building material asbestos surveyors, and we handle everything from the legally required preliminary surveys to the cover method and removal of asbestos-containing roofing materials. As of October 15, 2026, there were no municipal subsidies for asbestos surveys or removal work found on the official page of Inagi City. For notifications regarding dust prevention, please check with the city’s Living Environment Division or the Tokyo Metropolitan Government during the planning stage of the construction.
- What happens if large-scale repairs are not done?
- There are risks such as personal accidents due to falling exterior tiles, structural deterioration due to corrosion of rebar, leaks, and a decrease in asset value. Furthermore, for buildings subject to regular reporting under Article 12 of the Building Standards Act, investigations through full tapping and other methods are required under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovations for tiled or mortar-finished walls. Regular reporting for buildings in Inagi City is overseen by the Tokyo Metropolitan Government’s Tama Building Guidance Office, not the city. Please check the conditions for applicable uses and scales, such as the number of floors or floor area for multi-family residences, on the Tokyo Metropolitan Government’s list of regular reporting targets or at their office. Mixed-use buildings, including stores, restaurants, hospitals, and hotels, may also be subject to reporting depending on their use and scale, so individual confirmation is necessary. Even if not subject to statutory investigations, regular inspections and maintenance are essential, so please consult us if you are unsure.
- How much does large-scale repair for an apartment (about 10 units) cost?
- For a two-story wooden building with 6 to 10 units, the estimate is between 2,000,000 and 4,000,000 yen, and for a three-story steel or RC building with 10 to 20 units, it is between 4,000,000 and 9,000,000 yen based on our company’s past performance (including scaffolding, substrate repairs, exterior wall painting, sealing, and waterproofing). It is common for apartments to undergo repairs every 10 to 15 years. For owners, there is an increasing trend to change the appearance through color simulations during repairs to improve occupancy rates.
If you are looking for a large-scale repair contractor in Inagi City, contact Kakeru Koumuten
Our company handles exterior wall renovations and large-scale repairs for condominiums and apartments in Inagi City, covering all of Kanagawa and Tokyo. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. “I want it to last long with one renovation” “I want to keep costs down as much as possible” “I want to improve insulation performance because the indoors are hot” We will propose the best solutions for your specific requests and future repair plans.
From temporary scaffolding work to roofing and exterior wall painting, all work is performed by our own team. We are confident that we will not be outdone by others in terms of cost, quality, and planning, so we welcome comparative estimates!
On-site surveys, estimates, and color simulations are all free
Please feel free to consult us via the inquiry form, phone, or LINE.
It is also fine to just present estimates from other companies.
Areas Covered for Large-Scale Repair Work
Kakeru Koumuten accepts requests throughout Kanagawa and Tokyo.
Daimaru / Oshitate / Koyodai / Sakahama / Nagamine / Higashinaganuma / Hirao / Momomura / Yanokuchi / Wakabadai
・When should large-scale renovations be carried out? An explanation of the optimal timing and risks of postponement!
・Estimates are essential when conducting large-scale renovations! Key points for comparison and precautions!
・5 common troubles in large-scale renovations of condominiums! A thorough explanation of causes and prevention measures!
・What is waterproofing work in large-scale renovations? A thorough explanation of its role, signs of deterioration, and precautions!
・Not enough funds for large-scale renovations… An explanation of how to deal with funding shortages and preparations you can do right now!
・What is substrate repair, which is important in large-scale renovations? A thorough explanation of its necessity, signs of deterioration, and types of work!
・What is sealing work in large-scale renovations? An introduction to its role, methods, and tips for avoiding mistakes!
・What is tile repair, which is important in large-scale renovations? An explanation of signs of deterioration, types of work, and cost averages!
・What is exterior wall painting, which is important in large-scale renovations? A thorough explanation of its necessity, signs of deterioration, and cost averages!
・For exterior renovations in Inagi City, Tokyo, trust Kakeru Koumuten!
・For roof renovations in Inagi City, Tokyo, trust Kakeru Koumuten!
・For exterior wall painting in Inagi City, Tokyo, trust Kakeru Koumuten!
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contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
