Leave the repairs and renovations of condominiums and apartments in Atsugi City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!

Large-Scale Repairs for Condominiums, Apartments, and Buildings in Atsugi City, Kanagawa Prefecture

Large-scale repair work that can be handled in Atsugi City, Kanagawa Prefecture

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

Determining the Scope of Major Repairs from 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 Co., Ltd., we conduct a free on-site survey to confirm the following and summarize it in a deterioration diagnosis report with photos, after which we will propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Repairs in Atsugi City, Kanagawa Prefecture

The reason why we can be entrusted with large-scale renovations in Atsugi City is that we have “initiatives that cannot be imitated by other companies in large-scale renovation work”, which has received high praise from many customers.

1. Equipment Specialized for Exterior Renovations

Kakeru Koumuten Co., Ltd. has 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 Ownership of 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 enough scaffolding materials for approximately 100 single-family homes!

Storage of Materials in Our Large In-house 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 even in emergencies!

In-house Sorting of Waste Materials

Large-scale renovations generate various waste materials such as waste paint, metal, and wood. At Kakeru Koumuten, we sort and recycle waste materials in-house, leading to cost reductions in waste disposal fees.

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, 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 conduct inspections and actual construction for each process!

3. Various Permits and Skilled Workers

We have obtained construction industry permits and permits for industrial waste collection and transportation! We also have nationally certified sheet metal 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! Qualified personnel for asbestos work supervisors and building asbestos-containing material inspectors are also on staff, allowing us to handle asbestos-containing roofing materials 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 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 respond quickly to urgent requests or emergencies!

6. Staff Development

Our staff create various models for skill improvement 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 of and areas to check in each process 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 bulletin board at the entrance to display the construction schedule and notices! Additionally, we will thoroughly educate visitors on proper manners to minimize any inconvenience to residents and neighbors.

8. Strict Quality Control

Each stage of the process will be inspected by a responsible person, and detailed construction photos will be taken. We use a film thickness inspection machine and check sheets to ensure that there are no oversights in the inspections. During exterior 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 can prevent construction defects in advance. Of course, we will also take photos of the used paint and report them.

9. Exterior 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 increase occupancy rates! Of course, we can also arrange paint samples for actual color confirmation.

* In Atsugi City, the entire area is designated as a landscape planning zone, and buildings exceeding 10m in height or with a total floor area of 1,000㎡ or more are subject to notification for changes in exterior wall colors (including repainting in the same color). When deciding on colors, it is also necessary to check for the existence of district plans and building agreements. 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 Test Paint!

You can order samples of the paint you are considering and conduct test painting on your exterior wall. By performing 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 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! We hope that renovating the appearance of your apartment or condominium will help increase occupancy rates.

Cost Estimates for Major Repairs in Atsugi City, Kanagawa Prefecture

The cost of major repairs varies significantly depending on the size of the building, the degree of deterioration, the scope of work, and the materials used. First, refer to the national average based on public statistics, then look at our company’s cost estimates based on construction performance by scale, and finally, review 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 cases (FY 2021), approximately 70% of the costs for major 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. Please note that the amounts in this survey do not include consumption tax and common temporary construction costs, so they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in FY2021” (200 companies, 818 cases) *Amounts do not include consumption tax or common temporary costs. Percentages may 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 “Survey on Large-Scale Renovation Work for Condominiums in FY2021” (Second survey of large-scale renovation 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 works, 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 Repairs, Exterior Wall Painting, Waterproofing, Sealing as a Whole)

*The above estimates are based on Kakeru Koumuten’s construction records and may vary depending on the presence of roofing work, steel work, plumbing, etc. For condominiums, please also consider the amount calculated by multiplying the national statistics (750,000 – 1,500,000 JPY per unit) by the number of units.

Breakdown of Costs for Temporary Works, Substrate Repair, Exterior Walls, and Waterproofing

The estimate for large-scale repairs is broadly divided into “Temporary Works,” “Substrate Repair,” “Sealing,” “Exterior Wall Painting,” “Waterproofing,” and “Miscellaneous Expenses.” Before comparing total amounts, please check what each item includes, how much, and at what cost.

Examples of Unit Prices for Repair Work

*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.” 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 for shaded and humid areas can change durability.

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 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 insufficient.

Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Atsugi City, Kanagawa Prefecture

As of now, the official website of Atsugi City and Kanagawa Prefecture does not confirm any subsidies specifically for large-scale renovation work. The available options can be broadly categorized into five types. The eligibility and application status of these systems may change even mid-year, so please be sure to confirm with our company or the respective offices before contracting or starting work. (As of October 9, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs that contribute to the longevity of certain condominium units meeting specific requirements (performing exterior painting, floor waterproofing, and roof waterproofing as a single project) are carried out, the property 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, and Atsugi City’s official page states that the property tax for the house for the fiscal year following the year of completion of the work is halved (50%).

② 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 meets one of the requirements for the Longevity Promotion Tax System (certification alone does not result in tax reduction). Condominiums in Atsugi City are certified through Atsugi City. The main criteria include holding meetings at least once a year, organizing management regulations, separate accounting for management fees and repair reserve funds, having overdue repair reserve funds of no more than 10% of the total for more than 3 months, and having a long-term repair plan that includes large-scale repair work at least twice and has been created or reviewed within 7 years with a planning period of over 30 years.

③ Consultation Destinations for Condominium Management (Atsugi City, Kanagawa Prefecture)

The official site of Atsugi City offers a free consultation system for management associations. You can consult a third party before placing orders regarding the review of long-term repair plans and the progress of large-scale repairs. The contact point is the Housing Division Housing Policy Section (046-225-2330).

* The Housing Division of Atsugi City also provides guidance to management associations regarding notifications from the Ministry of Land, Infrastructure, Transport and Tourism concerning large-scale repair orders and the Fair Trade Commission’s exclusion orders (for issues related to bid rigging and inappropriate consulting, please see the chapter below).

④ National Energy Conservation Support | Housing Energy Conservation 2026 Campaign

Changes for 2026The “Child-Rearing Green Housing Support Project” for 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 Reiwa 7, and will not be implemented in Reiwa 8. Please be careful not to base your financial plans on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Subsidies for Housing in Atsugi City, Kanagawa Prefecture (for individual residents’ homes)

* The existing housing energy-saving renovation subsidy from the prefecture does not cover common areas of rental apartments or units not occupied by the owner. The official website of Atsugi City did not confirm any general renovation subsidies for exterior wall painting or roof painting. It is unclear whether the city’s energy-saving housing and solar incentive program will accept applications for Reiwa 8 and whether it applies to apartment buildings (please check with the city’s Environmental Policy Division). The Housing Division has also issued a warning regarding websites claiming “city subsidies are available.”

⑥ Financing System (Housing Finance Agency Apartment Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Atsugi City, Kanagawa Prefecture

Atsugi City is located almost in the center of Kanagawa Prefecture, expanding to the west into the Tanzawa mountain range and to the east into the plains along the Sagami River, with a population of approximately 220,000. The population surged from the 1950s to the 1970s, leading to the development of industrial parks and residential areas, resulting in a thick layer of building ages, with condominiums exceeding half of the housing. The numbers below are based only on publicly available data.

Source: Atsugi City Statistical Monthly Report (As of June 1, Reiwa 8) (Estimates based on the preliminary results of the 2020 national census, which will be recalculated after the publication of confirmed values) / Atsugi City “Geography” / Atsugi City Condominium Actual Survey Report (December 2020) / Atsugi City “District Planning”

Atsugi City has distinct layers of buildings from the “period of rapid population growth”

The population of Atsugi City, according to the national census, increased from 46,243 people in Showa 35 (1960) to 145,392 people in Showa 55, approximately 3.1 times over 20 years. It has continued to grow, reaching 223,705 people in Reiwa 2, with 100,360 households. The Housing and Land Statistical Survey (Heisei 30) shows that the number of collective housing units is 48,860, accounting for 51.5% of all housing, surpassing single-family homes since the survey in Heisei 15. The values for Atsugi City in the same survey for Reiwa 5 could not be confirmed, so the table below serves as a guideline based on population and development over the years. The actual construction year varies by building.

Source: Statistics Atsugi (Census Population)・ (Number of Households)／Statistics Atsugi Timeline／Atsugi City “First Inland Industrial Park”／Atsugi City Basic Housing Plan (Summary of the 2018 Housing and Land Statistics Survey) *The age of the building is an estimate calculated from the year of construction and is not based on statistical data regarding the construction period.

Four Factors Influencing Buildings and Construction in Atsugi City

Based on public documents, we have organized four characteristics that are linked to large-scale repairs. Atsugi City is an inland city not facing the sea, so the focus is on temperature differences, heavy rain, and the flow of water from rivers and foothills.

Source: Statistics Atsugi (Weather) / Atsugi City Urban Master Plan / Atsugi City “Flood Hazard Map” / Atsugi City Disaster Prevention Urban Development Plan / Kanagawa Prefecture “Designated Areas for Sediment Disaster Warning” / Atsugi City “Land Use Zones” / Atsugi City “Landscape Law and Landscape Ordinance Notification”・Notification Q&A / Atsugi City “District Planning” / Atsugi City “Building Agreements” ※Weather data is based on observations published in the city’s statistical report.

Key Points to Consider When Advancing Construction in Atsugi City

Source: Atsugi City “Narrow Roads”／Atsugi City Urban Master Plan／Atsugi City “Landscape Law and Landscape Ordinance Notification”／Notification Q&A／Atsugi City “Zoning”

*We accept consultations throughout Atsugi City.

Signs of Deterioration Requiring Major Repairs and Timing

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 the 12 to 15 year range, and the cycle tends to shorten with each occurrence. However, the actual judgment should be based on the condition of deterioration rather than just the number of years, so if you notice any of the symptoms 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. 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 “Guidelines for Creating Long-Term Repair Plans” (Revised June 2024, PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on Major Repair Works 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. The building had leaks from several locations, and we combined clear waterproofing for the tile exterior walls with waterproofing for the roof for the renovation.

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

Customer Feedback

Flow from On-Site Investigation to Completion of Work

From the initial inquiry to project completion 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 construction start date allows for a smoother progression.

1. Inquiry (Free) Please contact us via phone, form, or LINE. If you have estimates from other companies, it’s fine to just present those.
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, use drones or thermal imaging to investigate the rooftop, high places, and leak areas. For properties in Atsugi City, we will also check the site conditions, trees, the relationship with rivers and slopes, as well as the delivery route and parking.
3. Investigation Report & Estimate Submission 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.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial painting. For management associations, we will assist in preparing materials for the general meeting. We will also explain the color standards for landscape planning and areas subject to district planning and building agreements.
5. Notification to Residents & Neighbors We will distribute construction notifications, visit neighbors to greet them, and set up a bulletin board at the entrance (with a schedule and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
6. Temporary Scaffold Installation & Various Works Our in-house scaffold team will set up scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → ironwork & ancillary work in that order. A supervisor will inspect each stage 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 paint used, and a warranty certificate.
8. Aftercare We will send annual DM notifications, and inspections can be conducted every year. Simple repairs such as partial sealing are provided free of charge.

Resident Interaction, Additional Work Approval, Inspection Reports

Equally important as the construction itself is “when, what, and with what materials we report”. At Kakeru Koumuten, we will provide materials and reports in the following four scenarios.

* For management associations, it is smooth to decide in advance who will approve additional work (chairperson, repair committee, etc.) and the approximate amount that requires approval before the contract.

What Will Life Be Like During Construction? Impact on Residents

For large-scale repairs, the principle is to proceed while residents remain in their homes. However, there will be limitations on daily life while scaffolding is in place. Most troubles can be prevented 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 Method

There are many large-scale repair contractors that cover Atsugi City, Kanagawa Prefecture, 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 achievements. If they provide detailed explanations of repair work with photos, it gives you peace of mind as a reference when you actually request their services.

Using Google and review sites to evaluate large-scale repair contractors can also be effective! Be cautious if there are many negative reviews. If there are few reviews, also check their construction achievements, explanation content, and 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, etc., 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 Warranty and Aftercare Services

When choosing a large-scale repair company, let’s confirm the presence of a warranty. 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 a warranty period are often confident in their work, making it a criterion for selecting a contractor.

The warranty period varies depending on the contractor and the scope of work, but it is generally set between 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 the warranty, 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 support for simple repairs such as partial sealing.

Obtain Estimates from Multiple Contractors (at least 3 companies)

When requesting large-scale repairs, let’s obtain estimates from multiple contractors. It is important to obtain estimates from at least 3 companies and compare their estimates and reports! Even for the same scope of work, costs can vary between contractors, and warranties and aftercare services may differ. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, be sure to look at not just the costs, but also “the items in the estimate,” “the methods and materials for substrate repairs and exterior wall painting,” and “confirmation of the process” to make a detailed judgment! If the quality of auxiliary materials is low or if processes 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, be sure to check whether the repair method is suitable 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 content will change depending on the actual deterioration state and customer preferences.

Contractors that completely delegate to subcontractors lack knowledge and experience, which may lead 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 delegate to subcontractors may also have delayed responses in case of any troubles during construction. It is safer to avoid companies that do not have direct meetings with customers managing 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 problem. 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 a total of 1.63788 billion yen in 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

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 vendor selection process in meeting 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 Atsugi City, Kanagawa Prefecture

How much does large-scale repair in Atsugi City, Kanagawa Prefecture cost?

For apartments, according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey, 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 range being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, 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-scale apartments or mixed-use buildings from 5,000,000 to 15,000,000 yen. Costs may vary depending on the condition of the substrate and whether waterproofing or roofing work is needed, so we provide free on-site estimates.

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 signs of deterioration such as sealing degradation, tile lifting, or waterproof layer rupture are observed, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately save costs. In Atsugi City, the population surged from 82,894 in 1970 to 145,392 in 1980 (according to the national census), and buildings constructed during that period tend to require more tile repairs, steel part replacements, and updates to water supply and drainage pipes.

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

For apartments, the construction period is typically 3 weeks to 2 months, for small-scale apartments or buildings 1.5 to 3 months, and for apartments with over 50 units about 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 take thorough measures to minimize the impact on daily life, including distributing advance notices, providing information on the schedule and laundry through bulletin boards, and strictly adhering to work hours.

How long should I 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 comfortably. 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 Atsugi City, Kanagawa Prefecture?

As of October 9, 2026, no subsidies for large-scale repair work itself have been confirmed on the official Atsugi City and Kanagawa Prefecture websites. However, for condominium apartments, if certain conditions are met, a reduction in property tax under the “Condominium Longevity Promotion Tax System” can be utilized (the official Atsugi City page indicates a 50% reduction). One of the requirements for this tax system is obtaining management plan certification, which is handled by Atsugi City. Atsugi City also offers free advisory services and management consultations for management associations. If the work includes windows and insulation, it may qualify for “Advanced Window Renovation 2026” or “Future Eco Housing 2026.” Subsidies for wooden house seismic retrofitting are primarily for individual residential houses. The application timing and applicants vary by program, so please check the eligibility conditions and application procedures for each program before contracting or starting construction.

I heard that property taxes can be reduced with large-scale repairs; is that true?

If the requirements are met, a reduction will be applied. Under the Condominium Longevity Promotion Tax System, large-scale repairs that contribute to longevity, such as exterior wall painting, floor waterproofing, and roof waterproofing (conducted as a package), for condominiums that are over 20 years old and have more than 10 units, will result in a reduction of the property tax amount for the following year by up to the equivalent of 100 square meters per unit. The reduction rate is determined by local ordinances, and the official Atsugi City page indicates a 50% reduction. The eligible period is for work completed between April 1, 2023, and March 31, 2027, with applications submitted to the Atsugi City Finance Department Asset Tax Division Building and Depreciable Assets Section (046-225-2031), and the application deadline is within 3 months after the completion of the work. For management plan certified condominiums, there are also requirements such as increasing the repair reserve fund, which takes time to prepare, so it is recommended to start the process more than a year before construction.

Are there any changes to subsidies starting in fiscal year 2026?

There is. The national “Child-Rearing 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 fiscal year 2025 and will not be implemented in fiscal year 2026. 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 establish financial plans based on outdated information.

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

There are mainly four options. ① Postpone less urgent work 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 financing from the Japan Housing Finance Agency. The agency’s financing for common area renovations 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 and seismic work. Please note that postponing waterproofing and tile peeling measures often ends up being more expensive, so please consult us for decisions on separation.

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

Yes, it can be set up. Atsugi City has an elevation difference of about 1,200m from the mountains of Tanzawa to the plains along the Sagami River, and the city designates public roads with a width of less than 4m as “narrow roads.” The height difference and delivery routes vary by building. Kakeru Koumuten Co., Ltd. owns scaffolding materials and has its own scaffolding team, allowing us to plan support for the boards, layout, and delivery routes after confirming the site. This is a part where additional costs are likely to arise after seeing the site, so it is important to confirm the delivery route at the estimation stage.

What happens to the residents’ parking 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 I freely decide the color of the exterior walls?

Atsugi City is designated as a landscape planning area, and buildings over 10m in height or with a total floor area of 1,000㎡ or more require notification for changes to the exterior wall color (according to the city’s Q&A, even repainting in the same color for buildings of the specified scale requires notification). Notification is required at least 30 days before starting work, and color standards differ between urbanized areas and urbanization control areas. Additionally, there are 13 district plans and 10 building agreements published on the city’s page. Whether notification is necessary depends on the building and the nature of the work, so please check in advance with the Urban Planning Division, Urban Planning Section (046-225-2401). We will also investigate this during our survey. Sharing a color simulation to visualize 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?

This is because areas with poor sunlight and trapped moisture are prone to the growth of algae, moss, and mold. In addition to the north side, areas that do not receive sunlight due to neighboring buildings or trees are also likely to be affected. By thoroughly removing them with high-pressure washing and choosing paint with anti-algae and anti-mold properties, recurrence can be minimized. Additionally, we recommend checking for blockages in roof drains and gutters caused by leaves and mud, as these can lead to puddles on the roof and cause leaks.

Which method should I choose: responsibility construction method or design supervision method?

In smaller buildings, the burden of consulting fees tends to be heavier, so we believe that the responsibility construction method is often more suitable for medium-sized buildings. On the other hand, for large buildings with many units, the design supervision method allows a third party to standardize specifications, providing significant advantages for comparison under the same conditions. The design supervision method allows for comparison of construction companies under the same conditions since a third party creates the specifications, but it incurs separate consulting fees and requires caution regarding conflicts of interest and collusion risks. Even with the responsibility construction method, verifying price, specifications, and construction status is essential. Kakeru Koumuten Co., Ltd. provides estimates that clearly state quantities, methods, and materials for each construction item, allowing you to compare them on the same level as other companies.

How can I detect collusion in large-scale repairs?

There are three typical methods. ① Deciding on a contractor in advance and having other companies submit only formal high estimates, known as “dummy estimates.” ② Consultants contract at extremely low design management fees and receive kickbacks from partner companies, creating collusion. ③ Adding a portion of the contract amount as a back margin to the construction costs. The countermeasures are to obtain independent estimates, consult with a neutral third party, keep minutes of the selection process, and include a penalty clause in the contract. On September 28, 2026, the Japan Fair Trade Commission announced an exclusion order and a payment order for surcharges related to large-scale repair work.

How many companies should I get estimates from?

We recommend at least three companies. If there are too many, it becomes difficult to compare, and if there are too few, competition does not occur. What is important is not the number of companies but “to create the same playing field before comparing.” By creating a common specification sheet and quantity table and requesting under the same conditions, and by making detailed breakdowns mandatory without allowing “one set” notation, it becomes clear whether the price differences are due to differences in scope or unit prices.

What is the difference if you have your own scaffolding?

In large-scale repair construction, temporary construction accounts for about 20% of the costs (according to the Ministry of Land, Infrastructure, Transport and Tourism’s FY2021 survey). By not outsourcing scaffolding work, it is easier to control costs in this area, and our in-house scaffolding team can flexibly respond to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffolding materials for about 100 detached houses and plans according to the site, even in locations with height differences or narrow front roads.

I’m in the middle of getting estimates; can I just have the estimate documents reviewed?

Of course, that’s possible. If you bring estimates from other companies, we will check for free whether the items, quantities, methods, and materials are appropriate and provide you with an estimate under the same conditions. We welcome comparative estimates.

Can I request just emergency repairs for a leak?

Yes. As a preliminary step before large-scale repairs, we also accept requests for emergency repairs or partial repairs for leaks. We will identify the cause using thermal imaging and drones and propose the minimum necessary repairs.

Can you handle roofing or exterior wall materials that contain asbestos?

Yes, we can. We have qualified personnel who are certified as asbestos work supervisors and building material inspectors for asbestos-containing materials. We handle everything from the legally required preliminary surveys to the cover method and removal of asbestos-containing roofing materials. We could not find information on subsidy systems for the investigation and removal of sprayed asbestos on the official website of Atsugi City. For the latest information, please check with the Atsugi City Building Guidance Division (046-225-2430).

What happens if large-scale repairs are not done?

There are risks such as personal injury from falling exterior wall 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 probing, etc., are required under certain conditions, such as when more than ten years have passed since completion or exterior wall renovations for tile or mortar-finished walls. Regular reporting for buildings in Atsugi City is designated by the city, so conditions such as the number of floors and floor area of apartment buildings should be confirmed with the Atsugi City Building Guidance Division. Complex buildings, including stores, restaurants, hospitals, and hotels, may also be subject to regulations 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 around 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 repairs, exterior wall painting, sealing, and waterproofing as a whole). 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 Atsugi City, Kanagawa Prefecture, contact Kakeru Koumuten Co., Ltd.

Our company handles exterior wall renovations and large-scale repairs for condominiums and apartments in Atsugi City, covering all areas of Kanagawa Prefecture 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 a long time with one renovation” “I want to keep costs as low 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 roof work and exterior painting, all work is performed by our own team. We are confident that we will not be outdone in terms of cost, quality, and organization compared to other companies, so we welcome competitive estimates!

Areas Covered for Large-Scale Repair Work

Kakeru Koumuten accepts requests covering all areas of Kanagawa Prefecture and Tokyo.

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