Leave the repairs and renovations of condominiums and apartments in Hamura City, Tokyo to Kakeru Koumuten Co., Ltd.!

Large-Scale Renovations for Condominiums, Apartments, and Buildings in Hamura City, Tokyo

Large-scale repair work that can be handled in Hamura City, Tokyo

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but a comprehensive repair of the entire building’s deterioration while scaffolding is in place. Kakeru Koumuten can handle all of the following work in-house, ensuring clear responsibility and coordination of the process.

Scope of Major Repairs Determined by Building Diagnosis

It is not always necessary to perform all of the above works. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten, we conduct a free on-site survey to confirm the items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Hamura City, Tokyo

The reason why we can be entrusted with large-scale renovations in Hamura 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 for scaffolding work and provide quick and flexible responses.
We own scaffolding materials for approximately 100 detached houses!

Material Storage 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 can procure materials at a lower cost! Additionally, since we always have stock available, we can provide swift responses in emergencies!

In-house Waste Separation

During large-scale renovations, various waste materials such as waste 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, you can not only have meetings but also check actual samples and colors of exterior materials. You can also perform color simulations for exterior wall painting and check heat insulation properties using a heat insulation testing machine!

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 by Kakeru Koumuten, 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, whether it is the sales representative or construction management representative, smooth communication is possible.

We can fully handle everything from temporary scaffolding installation to exterior wall painting, substrate repairs, waterproofing work, and tile repairs with our own team! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Obtaining Various Permits and Skilled Workers

We have obtained construction industry licenses and permits for industrial waste collection and transportation! We also have national qualified sheet metal workers and painting skilled workers, and we are confident in our construction techniques. We can also handle large-scale roofing work for factories and other buildings! We have qualified personnel for asbestos work supervisors and building materials containing asbestos inspectors, so we can handle materials containing asbestos and conduct preliminary surveys.

4. Warranty and Aftercare

Most large-scale repair works, including “painting work,” “substrate repair work,” and “waterproofing work,” come with a warranty!
Aftercare 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 and emergencies!

6. Staff Development

Our staff create various models for skill enhancement 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 pay attention to and areas to check during each stage of large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair 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 visitors on manners and take care to minimize any inconvenience to residents and neighbors.

8. Thorough Quality Control

Each process will be inspected by a responsible person, and detailed construction photos will be taken. We will use film thickness inspection machines and check sheets to ensure that there are no oversights in the 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 we will order paint in-house to 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 created by our company can be done using actual photos of your apartment or building!Simulations can also be done 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 paint samples for actual color confirmation.

* I could not find the city’s unique landscape plan or landscape regulations on the official page of Hamura City. In the general area of Tokyo’s landscape plan (municipal area), buildings over 45m in height or with a total floor area of 15,000㎡ or more are subject to notification, and 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 judgment is based on the overall scale of the building, and notification is required at least 30 days before starting work. Green Space Landscape Division 03-5388-3265). Additionally, in the area of district planning, there may be restrictions on buildings (please check with the city’s office). Having a color simulation screen will help facilitate explanations to the general meeting, neighbors, owners, and residents.

9-2 Confirm the actual color with a trial paint!

You can order samples of the paint you are considering and conduct trial painting on your exterior wall. By conducting a trial 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 applying metal siding
・Simulation using accent materials such as cornices and louvers
・Simulation for roof painting and roof replacement work

With the exterior renovation simulation, you can minimize the risk of failure in changing the image! I hope that renovating the appearance of apartments and condominiums will help increase occupancy rates.

Cost Estimates for Major Repairs in Hamura City, Tokyo

The cost of major repairs varies greatly depending on the size of the building, the degree of deterioration, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s cost estimates based on construction results by scale, and finally to examples of unit prices for each construction.

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 repairs 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 the amounts in this survey do not include consumption tax and common temporary costs, they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Repair Work 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)

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Repair Work for Condominiums” (Second compilation of large-scale repair work. 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 work, and others are included. This is an average value and not a criterion for judging the appropriateness of individual estimates.

Cost Estimates by Building Size (Scaffolding, Substrate Repair, Exterior Painting, Waterproofing, Sealing)

*The above is an estimate 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 consider the amount calculated by multiplying the national statistics above (750,000 – 1,500,000 JPY per unit) by the number of units as a reference.

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.

Unit Price Examples for Repair Work

*Costs and warranty periods vary depending on shape, quantity, substrate condition, and type of materials. Please feel free to contact us for a detailed estimate. Estimates are completely free.

Select Paint and Waterproofing Grades Based on “Years Until Next Repair”

“Good paint does not equal the right choice.” The best way to choose is to align when the next major repair will be with the lifespan of the materials to avoid waste.

* 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.

Guideline for Repair Reserve Funds and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the guideline for repair reserve funds on a monthly basis per exclusive area. Additional charges are required if there is a mechanical parking lot.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines on 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 funds are insufficient compared to the plan.” There are four main options when funds are insufficient.

Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Hamura City, Tokyo

Based on the information confirmed on Hamura City’s official page, there does not appear to be any city system that subsidizes the construction costs of large-scale renovations for condominium units. The city provides guidance on the management status reporting system and the procedures for management plan certification. 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 check with our company or each contact point before contracting or starting work. (As of October 15, 2026)

① Hamura City’s Condominium-related Systems and Consultation Points

We have organized the information provided by Hamura City for condominium management associations, as confirmed on the city’s official page. This is not a system that directly covers the costs of large-scale repairs.

② Condominium Longevity Promotion Tax System (Reduction of Fixed Asset Tax)

If large-scale repairs that contribute to the longevity of condominiums meeting certain requirements (such as exterior painting, floor waterproofing, and roof waterproofing carried out as a single project) are performed, the fixed asset tax amount for the building for the following 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. Since Hamura City is not part of the 23 wards of Tokyo, the fixed asset tax is a municipal tax. According to the official page of Hamura City (updated May 26, 2026), one-third of the fixed asset tax amount for houses that underwent large-scale repairs will be reduced for the following year, up to the equivalent of 100㎡ per unit. The application should be submitted to the Taxation Division (Hamura City Hall, 042-555-1111, Fixed Asset Tax Section, extension 152). (In the 23 wards of Tokyo, the fixed asset tax is a metropolitan tax, and the reduction rate is one-half.)

③ Management Plan Certification System (Entry for Tax and Interest Rate Benefits)

Receiving certification leads to interest rate benefits for loans and bonds from the Japan Housing Finance Agency, and fulfills one of the requirements for the longevity promotion tax system (certification alone does not result in tax reduction). Condominiums in Hamura City must apply to Hamura City via the Condominium Management Center.

④ National Energy Conservation Support | Housing Energy Conservation 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 7 and will not be implemented in Fiscal Year 8. Please be careful not to base your financial plans on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Tokyo’s Subsidies and Grants, and Hamura City’s Subsidy Information

* The Tokyo projects for rental housing are aimed at owners of rental apartments and rental condominiums, and no mention was found regarding management associations of condominium units as eligible applicants. The application status may change, so please be sure to check the official page before applying.

⑥ Loan System (Housing Finance Agency Mansion Sumairu Loan)

If the management association borrows funds for large-scale repairs, they can utilize the Housing Finance Agency’s “Mansion Common Area Renovation Loan (Mansion Sumairu Loan).”

Source: Housing Finance Agency “Mansion Sumairu Loan” (Official)

Tokyo Metropolitan Government Mansion Improvement Construction Subsidy (Interest Subsidy)

Cases Where Fire Insurance Can Be Used and Cases Where It Should Not Be Used

Building Conditions and Repair Points in Hamura City, Tokyo

The population of Hamura City is 54,126 people, and the number of households is 26,790 (as of January 1, Reiwa 7, according to city statistics). The city is located in the western part of Tokyo, on the river terrace along the right bank of the Tama River, with an area of 9.90 km². The city overview mentions that industrial parks were developed during the high economic growth period of the 1950s and 60s, attracting companies related to electronics and automobiles. According to the economic census of Reiwa 3, there are 127 factories within the city. The numbers below are only those verified from official documents.

Source: Hamura City “Statistics of Hamura City” (PDF) / Hamura City “City Overview (Reiwa 6)” (PDF) *Population density is calculated based on the area including the Yokota Air Base (0.417 km²) as published by the city.

In Hamura City, the points of repair for condominiums change by the year of construction

According to city materials, the number of condominium buildings and their breakdown by year of construction within the city could not be confirmed. In the national census (Reiwa 2), among the 23,259 general households living in residences, there are 14,295 owner-occupied homes, 7,089 private rentals, 1,113 public housing rentals, and 430 company housing units, but there is no distinction between single-family homes and apartments/condominiums. Therefore, the table below does not represent the distribution in Hamura City but serves as a general guideline for construction points that typically arise based on the year of construction. Please use this to consider the priority of diagnosis for your own building based on its year of construction.

Source: Hamura City “Statistics of Hamura City” (PDF)　※The age of construction is a general guideline calculated from the cutoff year and does not indicate the degree of deterioration.

Four Factors Influencing Buildings and Construction in Hamura City

Based on public documents, we have organized four characteristics that are linked to large-scale repairs. Hamura City is located on a river terrace along the Tama River, and during Typhoon No. 19 in Reiwa 1, there were damages from flooding and internal water in the Tama River. There are many factories, warehouses, and privately rented housing, so diagnosis according to the type of building, as well as scaffolding planning and drainage checks, are essential.

Source: Japan Meteorological Agency “Past Weather Data (Tokyo)” / Hamura City “Urban Planning Materials” (PDF) / Ministry of Land, Infrastructure, Transport and Tourism Keihin River Office “Flood Inundation Area Map for Tamagawa, Asakawa, and Oguragawa (Assumed Maximum Scale)” / Hamura City “Overview and Measures for Typhoon No. 19 in Reiwa Year 1” (PDF) / Hamura City “Overview of the City” (PDF) / Hamura City “Statistics of Hamura City” (PDF) / Hamura City “About Condominium Management” / Tokyo Metropolitan Government “Landscape Ordinance Q&A” (PDF)

Key Issues to Consider When Proceeding with Construction in Hamura City

Source: Hamura City “Civil Engineering Division” / Hamura City “Urban Planning Materials” (PDF) / Hamura City “Reiwa 8 Environmental Consideration Project Subsidy Program” / Hamura City “Overview and Measures for Typhoon No. 19 in Reiwa 1” (PDF) / Hamura City “City Overview” (PDF) / Tokyo Metropolitan “Landscape Ordinance Q&A” (PDF)

*We accept consultations throughout Hamura City.

Deterioration Symptoms and Timing Requiring Major Repairs

Generally, major repairs are recommended every 12 to 15 years. According to a survey by the Ministry of Land, Infrastructure, Transport and Tourism, the actual repair cycle is most commonly 13 years, with about 70% falling within 12 to 15 years, and the cycle tends to shorten with repeated repairs. However, the actual judgment should be based on the deterioration condition rather than the number of years, so if you observe symptoms like those listed below, we recommend an early on-site inspection.

Estimated Repair Cycles by Location (Ministry of Land, Infrastructure, Transport and Tourism Guidelines)

*The above are reference examples from the guidelines and are not uniform construction deadlines. The actual cycle will be set according to the building’s specifications, location conditions, and deterioration status.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Creating Long-Term Repair Plans” (Reiwa 6 June Revision – PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on the Actual Conditions of Large-Scale Renovation Work for Condominiums in FY2021”

Examples of Large-Scale Renovation Work

This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten Co., Ltd. The building had leaks occurring in several places, and we combined clear waterproofing for the tile exterior wall with rooftop waterproofing for the renovation.

Exterior Renovation Work for Mixed-Use Building (Tile Wall Waterproofing + Rooftop Waterproofing)

Customer Feedback

Flow from On-Site Survey 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 starting the process 1 to 1.5 years before the desired start date allows for a more relaxed progression.

1. Inquiry (Free) Please contact us via phone, form, or LINE. If you have estimates from other companies, just presenting those is fine.
2. On-site Investigation & Building Diagnosis (Free) We will conduct a survey of the exterior walls, 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 Hamura City, we will also check the site conditions, trees, road width, necessity of road occupation, distance from neighboring buildings, flood assumptions on the city’s hazard map, delivery routes, and parking.
3. 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. Proposals for multiple plans are also possible.
4. Plan Decision & Contract Confirm colors through color simulations, paint boards, and trial painting. For management associations, we will assist in preparing materials for the general meeting. If there are notifications required under Tokyo’s landscape regulations, we will also explain the color considerations.
5. Notification to Residents & Neighbors We will distribute construction notices, 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.
6. Temporary Scaffold Installation to Each Construction Our own scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → iron parts & ancillary work in that order. A responsible person will inspect each process and take construction photos.
7. Completion Inspection, Scaffold Dismantling & Handover We will confirm the finish in the presence of the customer and provide construction photos, a report on the paints used, and a warranty.
8. Aftercare We will send out annual DM notifications, and inspections can be conducted every year. Simple repairs such as partial sealing are provided free of charge.

Resident Communication, Additional Work Approval, 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 situations.

* For management associations, it is smooth to decide in advance who will approve additional work (such as the chairman or repair committee) and the amount that requires 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 restrictions 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.

How to choose a large-scale repair contractor and ordering methods

There are many large-scale repair contractors that cover Hamura 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

Large-scale repair contractors often have websites that showcase their exterior renovation work. If they provide detailed explanations of repair contents with photos, it gives you peace of mind as a reference when you actually request work.

Using Google and review site ratings as a reference when comparing large-scale repair contractors can be effective! Be cautious if there are many negative reviews. If there are few reviews, also check the construction track record, the content of explanations, and the management system.

Large-scale repair 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, and we receive many requests for exterior renovations of apartments and condominiums.

Check for warranties and aftercare services

When choosing a large-scale repair company, check for the presence of warranties. If any issues such as leaks occur after the work is completed, having a leak warranty from the contractor ensures that repairs can be made at no cost, 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 type of work, but a range of 1 to 10 years is common. Emergency repairs or partial fixes often do not come with leak warranties. Some contractors also offer 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 inspections each year. 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 repairs, be sure to obtain estimates from multiple contractors. It is important to get estimates from at least 3 companies and compare their estimates and reports! Even for the same work, costs can vary between contractors, and warranties and aftercare services may differ as well. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, consider not only the costs but also the “items in the estimate,” “methods and materials for substrate repairs and exterior wall painting,” and “confirmation of the process.” Make detailed comparisons to make informed decisions! 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 if the repair methods are appropriate for the condition of the substrate!

Check this on the estimate (checklist)

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 details will change based on the actual deterioration condition and customer preferences.

Contractors that completely outsource to subcontractors may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or meaningless 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 have delayed responses in case of any troubles during construction. It is advisable 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 the approach.

Especially for management associations, it is necessary to decide “how to request” before “which company to hire.” The main ordering methods are the following three.

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 on 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).

※This content is based on the announcement by the Japan Fair Trade Commission (September 28, 2026).

Three Typical Schemes

Source: Ministry of Land, Infrastructure, Transport and Tourism “On the Proper Ordering of Large-Scale Renovation Work for Condominiums” (Notification dated April 3, Reiwa 5, PDF)

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 Repairs in Hamura City, Tokyo

How much does large-scale repair in Hamura City, Tokyo cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, about 70% fall within the range of 750,000 to 1,500,000 yen (excluding consumption tax and common temporary construction costs), with the most common being between 1,000,000 and 1,250,000 yen. In our company’s track record, the cost for a two-story wooden apartment ranges from 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment from 4,000,000 to 9,000,000 yen, and for small condominiums or mixed-use buildings from 5,000,000 to 15,000,000 yen. The cost varies depending on the condition of the substrate and whether waterproofing or roofing work is required, so we will provide an estimate through a free on-site survey.

How often should large-scale repairs 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 deterioration of sealing, lifting of tiles, or rupture of the waterproof layer is observed, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. The materials from Hamura City did not confirm the number of condominium buildings or their breakdown by age. Generally, buildings aged 26 to 35 years enter their second to third repairs, focusing on replacing waterproof layers and sealing, as well as updating equipment. For buildings over 36 years old, updating water supply and drainage pipes is necessary, and for buildings constructed under the old seismic standards (before May 31, 1981), consideration of seismic diagnosis is also required. Each building’s situation is different, so we will make a judgment based on the on-site survey and long-term repair plan.

How long does the construction period take? Can residents stay during the work?

For apartments, the duration is approximately 3 weeks to 2 months, for small condominiums or buildings about 1.5 to 3 months, and for condominiums with over 50 units around 4 to 6 months. 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 thoroughly ensure minimal impact on daily life by distributing advance notices, 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 establishing a repair committee, conducting building diagnostics, selecting contractors, and passing resolutions at general meetings, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed with ample time. If using subsidies or tax incentives, obtaining management plan certification (resolutions at general meetings, prior confirmations, and certification applications) will also take time, so please factor that into your timeline.

Are there any subsidies available for large-scale repairs in Hamura City, Tokyo?

Based on the information available on Hamura City’s official page, there does not appear to be any municipal system that subsidizes the construction costs or deterioration diagnosis costs for large-scale repairs of condominiums (as of October 15, 2026. Please confirm with the city’s Building Division for final details). The city provides information on the management situation reporting system and the procedures for condominium management plan certification (there are no fees for the city). The reduction of fixed property tax (Condominium Longevity Promotion Tax System) is a national system, applicable to construction completed by March 31, 2027. According to the city’s official page (updated May 26, 2026), it is indicated that one unit up to 100 square meters can receive a reduction of one-third of the fixed property tax amount, with the tax office being the point of contact (042-555-1111). Consideration should also be given to loans from the Japan Housing Finance Agency and Tokyo’s “Condominium Improvement Construction Subsidy” (interest subsidies; the second phase for fiscal year 2026 is accepting applications until February 19, 2027). The city’s “Fiscal Year 2026 Environmental Consideration Project Subsidy System” (including high insulation and high heat shielding renovations) has reached its budget limit and ended acceptance on September 28, 2026, and the conditions for applicants are not specified in the text. If the work includes windows and insulation, there is a possibility of being eligible for the national “Advanced Window Renovation 2026,” “Mirai Eco Housing 2026,” and Tokyo’s energy-saving renovation promotion project for existing homes. The application timing and applicant conditions vary by system, so please check the eligibility conditions and application procedures for each system before contracting and starting work.

I heard that fixed property tax can be reduced through large-scale repairs. Is that true?

If the requirements are met, a reduction will be applied. Under the condominium longevity promotion tax system, if a condominium that is over 20 years old and has more than 10 units conducts large-scale repairs (such as exterior painting, floor waterproofing, and roof waterproofing as a single project) that contribute to its longevity, the fixed asset tax for the following year will be reduced for each unit up to the equivalent of 100 square meters. The reduction rate is determined by local government ordinances. The national program applies to projects completed between April 1, 2023, and March 31, 2027, and the application deadline is within three months after project completion. According to the official page of Hamura City (updated May 26, 2026), the reduction rate is one-third, and urban planning tax is not included. Applications should be submitted to the Taxation Division (Hamura City Hall, 042-555-1111). For certified management plan condominiums, there are additional requirements such as raising the repair reserve fund, so it is recommended to start preparations more than a year before the construction.

Are there any changes to subsidies starting in 2026?

Yes. The national “Childcare Green Housing Support Project” has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Management associations and management corporations can also become joint contractors, allowing for insulation renovations in common areas. Additionally, the “Long-term Excellent Housing Renovation Promotion Project” will end in the 2025 fiscal year, and there will be no implementation in the 2026 fiscal year. The “Advanced Window Renovation 2026 Project” has a method for collective applications for apartment buildings (the application process is handled by registered contractors). Please be careful not to base your financial plans on outdated information.

What should I do if the repair reserve fund is insufficient?

There are mainly four options. ① Postpone low-urgency repairs based on a deterioration diagnosis, ② Review the scope and specifications of the work, ③ Check for support systems such as subsidies, ④ Consider increasing the repair reserve fund or loans from the Japan Housing Finance Agency. The agency’s loan for renovations of common areas in condominiums does not require collateral, and interest rates can be reduced by up to 0.6% per year by obtaining management plan certification and implementing energy-saving or seismic work. Please note that postponing waterproofing and tile peeling measures often ends up being more expensive, so please consult us for decisions on separating these issues.

Can scaffolding be set up if there is a height difference on the site or if the front road is narrow?

Yes, it can be set up. In Hamura City, the scaffolding plan varies based on conditions such as the width of the front road and the distance to neighboring buildings. The focus of the scaffolding plan is the width of the front road, the distance to neighboring buildings, the delivery route, and whether a road occupancy permit is required. If scaffolding or temporary enclosures occupy the road, a permit from the road administrator is necessary (for municipal roads, it is the Hamura City Urban Development Department Civil Engineering Division Road Management Section; for prefectural and national roads, it is the respective road administrator). The application documents, standard processing periods, and approval criteria for scaffolding extensions and morning glories could not be confirmed on the city’s page, so please check at the service counter. The conditions of the site and delivery routes differ for each building. Kakeru Koumuten Co., Ltd. owns its scaffolding materials and has its own scaffolding team, allowing us to plan layouts, delivery routes, and delivery times after checking the site. Since additional costs are likely to arise after seeing the site, it is important to confirm the delivery route, whether occupancy is necessary, and the application schedule during the estimation phase.

What will happen to the parking for residents during construction?

Vehicles on the side where scaffolding will be erected will need to be temporarily moved. The number of parking spaces and availability varies by building, and securing a relocation spot may take time depending on the availability of nearby parking. Kakeru Koumuten Co., Ltd. will coordinate with you about the availability of nearby coin parking and monthly parking starting 2 to 3 months before construction begins.

Can the color of the exterior walls be freely decided?

On Hamura City’s official page, we could not confirm the city’s unique landscape plan or landscape ordinance. In the general area of the Tokyo Metropolitan Landscape Plan (municipal areas), buildings over 45 meters in height or with a total floor area of 15,000 square meters or more are subject to notification, and in the Tokyo Q&A, even repainting the same color is included (normal maintenance actions such as tile repairs are excluded. The scale of the entire building is considered, and notification is required 30 days before starting work. Green Space Landscape Division 03-5388-3265). Additionally, in areas subject to district planning, there may be restrictions on the form and design of buildings (please check at the city service counter). Whether notification is required depends on the location of the building and the scope of work, so please check in advance. We will also investigate this during our survey. Sharing a color simulation of the completed image can facilitate discussions at general meetings and with neighbors.

Why is the north-facing exterior wall particularly covered in moss and algae?

If large-scale repairs are not conducted, various issues can arise, including deterioration of building materials, increased risk of leaks, and potential structural damage. Over time, neglecting maintenance can lead to higher repair costs and reduced property value. Regular inspections and timely repairs are essential to ensure the longevity and safety of the building. It is advisable to address any signs of wear and tear promptly to avoid more significant problems in the future.There are risks such as personal injury due to the peeling of exterior wall tiles, structural deterioration due to corrosion of rebar, water leaks, and a decrease in asset value. Furthermore, for buildings subject to regular reporting under Article 12 of the Building Standards Act, an investigation through full tapping and other methods is required under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovation for tile or mortar-finished walls. Regular reporting for buildings in Hamura City is handled by the Tokyo 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 that qualify as multi-family housing, in the Tokyo reporting schedule (PDF) or at the office. Complex buildings including stores, restaurants, hospitals, and hotels may be subject to these requirements depending on their use and scale, so individual confirmation is necessary. Even if not subject to statutory investigation, 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, it is approximately 2 million to 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it is about 4 million to 9 million yen based on our company’s track record (including scaffolding, substrate repair, 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 Hamura City, Tokyo, contact Kakeru Koumuten

Our company handles exterior wall renovations and large-scale repairs for condominiums and apartments in Hamura 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 water 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!

Areas Covered for Large-Scale Repair Work

Kakeru Koumuten accepts requests covering all of Kanagawa and Tokyo.

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