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

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

Large-scale repair work that can be handled in Kamakura City

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. At Kakeru Koumuten, we 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 guaranteed that all of the above works will be performed. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten Co., Ltd., we conduct a free on-site survey to confirm the items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Kamakura City

The reason why we can be entrusted with large-scale repairs in Kamakura City is partly because “Kakeru Koumuten has a base in Yokohama City”, but also due to “our unique initiatives in large-scale repair work that cannot be imitated by other companies”, which have received high praise from many customers.

1. Equipment Specialized for Exterior Renovation

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 repairs. 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 repairs and can assemble scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs related to scaffolding work and provide quick and flexible responses.
We have approximately enough scaffolding materials for 100 single-family homes!

Storage of Materials in Our Large 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, we always have stock available, allowing us to respond quickly even in emergencies!

In-house Waste Sorting

Large-scale repairs generate various waste materials such as leftover paint, metal, and wood. At Kakeru Koumuten, we sort and recycle waste materials in-house, leading to cost savings on waste disposal.

Showroom Dedicated to Exterior Renovation

In the showroom, not only can you have meetings, but you can also check actual samples and colors of exterior materials. Color simulations for exterior wall painting and heat resistance tests using a heat resistance testing machine are also available!

2. Cost Reduction through In-House Management and Construction

One of Kakeru Koumuten’s major strengths is in-house management and construction.

By managing everything from inquiries to project completion in a consistent system, we can keep costs down while providing high-quality large-scale repairs. Additionally, one representative will handle everything from the estimate to project completion. Since the same person is responsible for sales and construction management, smooth communication is possible.

We can handle everything from temporary scaffolding installation to exterior wall painting, substrate repairs, waterproofing, and tile repairs with complete in-house construction! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Various Permits and Skilled Workers

We have obtained construction business licenses 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 projects for factories! We have qualified personnel for asbestos work supervisors and building material asbestos surveyors, so we can handle asbestos-containing roofing materials and 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 every 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 rain 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 rain leaks! We will respond quickly to urgent requests!

6. Staff Development

Our staff create various models for skill improvement and conduct practical training. Since different processing and techniques are required at each site, we regularly provide skill enhancement education to ensure that each staff member can respond appropriately. We also educate on points to be careful about and areas to check during each stage of large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we not only notify residents and greet neighbors, but also set up notice boards at entrances to display progress charts and announcements! Additionally, we ensure thorough etiquette training for entrants to minimize inconvenience to residents and neighbors.

8. Strict Quality Control

Each stage will be inspected by a responsible person, and detailed construction photos will be taken. We use film thickness inspection equipment and check sheets to prevent any oversight during inspections. When performing exterior wall painting or waterproofing work, we check the number of used paint cans to confirm that the specified amount of paint has been used, and we order paint in-house to prevent construction defects. Of course, we will also take photos of used paint and report them.

9. Color Simulation for Exterior Wall Painting

9-1 Self Color Simulation

The simulations created by our company 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 changing to a two-tone color or altering the image, we hope to help enhance the stylish appearance and increase occupancy rates! Of course, we can also arrange paint samples for actual color confirmation.

*In Kamakura City, there are areas such as scenic districts, landscape districts, and historical preservation zones where procedures are required for color changes. Since the regulations differ by area, prior confirmation of the exterior wall color is necessary. Having the color simulation screen will help facilitate explanations at community meetings and general meetings.

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

You can order samples of the paint you are considering and perform a test paint on your exterior wall. By conducting a test paint, you can confirm the actual color and gloss!

9-3 Exterior renovation simulation

Exterior simulations for apartments and condominiums are also possible!
・Exterior wall color simulation (two-tone colors are also possible)
・Simulation for when metal siding is applied
・Simulation for when accent materials such as cornices and louvers are used
・Simulation for roof painting or roof replacement work

With the exterior renovation simulation, you can minimize the risk of failure in image changes! We hope that renovating the appearance of your apartment or condominium will help increase occupancy rates.

Cost Estimates for Large-Scale Renovations in Kamakura City

The cost of large-scale renovations varies significantly depending on the size of the building, its condition, the scope of work, and the materials used. First, let’s look at the national average based on public statistics, followed by our company’s estimates based on past projects categorized by size, and finally, examples of unit prices for specific renovations.

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 large-scale renovations 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. Note that the amounts in this survey do not include consumption tax and common temporary costs, so they differ from the current total cost including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Renovations of Condominiums” (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 “Fiscal Year 2021 Survey on Actual Conditions of Large-Scale Repair Work for Condominiums” (Second survey of large-scale repair work. The overall average is 59.0% for construction-related, 22.3% for temporary works, and 9.9% for miscellaneous expenses). *The total does not add up to 100% because it includes equipment-related work, exterior works, and others. This is an average value and is not a criterion for judging the appropriateness of individual estimates.

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

*The above is an estimate based on Kakeru Koumuten’s construction performance and may vary depending on the presence of roofing work, metal work, plumbing, etc. For condominiums, please also consider the amount obtained by multiplying the above national statistics (750,000 – 1,500,000 JPY per unit) by the number of units as a reference.

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 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 depending 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 to perform the next major repair 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. The rate of deterioration differs for each side due to location, sunlight, and ventilation, so conducting a site survey to check the condition of each side and selecting paint suitable for the location 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 necessary 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 comprehensive survey for the fiscal year Reiwa 5, 36.6% of management associations responded that “the repair reserve fund is insufficient compared to the plan.” If there is a shortfall, there are four main options.

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

Both Kamakura City and Kanagawa Prefecture could not confirm any subsidies specifically for large-scale renovation work based on publicly available information (the city does have subsidies for seismic diagnosis of condominiums). The four main types available are as follows. The eligibility and application status of the systems may change during the fiscal year, so be sure to check with our company or each contact point before contracting or starting construction.(As of October 8, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs (such as exterior painting, floor waterproofing, and roof waterproofing) that contribute to the longevity of condominiums meeting certain requirements are carried out, the property tax amount for the residential portion will be reduced (up to 100㎡ per unit). The reduction rate in Kamakura City is one-third. The reduction applies only to the next fiscal year after the completion of the work.

*The application destination is the Kamakura City General Affairs Department, Asset Tax Division (phone 0467-61-3931). For detailed requirements regarding management plan certification and advice/guidance, please confirm with the Urban Policy Department, Urban Planning Division (phone 0467-61-3408) before the construction.

② Support for condominium management in Kamakura City and Kanagawa Prefecture (Management associations should start here)

The contact point for condominium-related matters in Kamakura City is the Urban Policy Department, Urban Planning Division (phone 0467-61-3408). On the city’s public page, no subsidies for the construction costs of large-scale repairs were confirmed. The focus is on consultation, planning, and support for diagnostics.

Source: Kamakura City “Information on Condominium Management” / Same “Subsidy for Condominium Earthquake Resistance Diagnosis”

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

This system is implemented by Kamakura City based on national regulations (the certification review is conducted through the Management Plan Certification Procedure Support Service). Upon receiving certification, there are interest rate benefits for the Housing Finance Agency’s “Condominium Common Area Renovation Loans” and Flat 35 (Maintenance Type), and it is also related to one of the requirements for the Long Lifespan Promotion Tax System (certification alone does not guarantee tax reduction). The certification requirements are based on the national “Standards for Condominium Management,” which includes 16 items. Key criteria include holding general meetings at least once a year, maintaining management regulations, separate accounting for management fees and repair reserve funds, ensuring that overdue amounts for more than three months are within 10% of the total, and “having a long-term repair plan that includes two or more large-scale repair works, created or reviewed within seven years, with a planning period of over 30 years.” Applications cannot be made directly to the city and must be submitted through the Public Interest Incorporated Foundation Condominium Management Center. Additionally, there are unique standards related to the city’s disaster prevention, and for those items, a declaration guarantee and disaster prevention measures documentation must be submitted to the Urban Planning Division.

* The fees and the validity period of the certification are not listed on the city’s page. Please check with the Condominium Management Center or the Urban Planning Division. Certified condominiums from Reiwa 6 to Reiwa 8 are listed on the city’s page.

④ National Energy Saving Support | Housing Energy Saving 2026 Campaign

Changes for Fiscal Year 2026The “Childcare 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 create financial plans based on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Applications for FY 2026 have closed)

* The subsidy for existing housing energy saving renovation costs does not apply to common areas of rental apartments or units where the owner does not reside.

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Kamakura City

Kamakura City is a city surrounded by hills on three sides and facing Sagami Bay to the south. It has an area of 39.66 km², and within the city, there are areas with different environments, from the urban area around Kamakura Station to residential areas in the hilly regions called “yato,” and the coastal residential and tourist areas of Ofuna, Tamagawa, and Fukazawa. Furthermore, there are overlapping rules related to appearance such as scenic districts, landscape districts, and historical preservation areas, which means that the way buildings deteriorate, the method of scaffolding, and the procedures for changing colors vary depending on the location.

Source: Kamakura City “Population of Kamakura” as of December 1, Reiwa 7 (estimated based on the 2020 national census)／Same “Kamakura City Scenic Area Ordinance”

Buildings in Kamakura City are divided into “four types”

Kamakura City has different topography and appearance rules depending on the location, so not only the age of the building but also the location of the building (scenic areas around Kamakura Station and Kitakamakura Station, scenic districts, historical preservation areas, coastal areas, valleys, hilly areas, and other residential areas) will affect the extent of work and procedures required for the next major renovation. Please check which type your building falls under.

Source: Kamakura City “Scenic District” / Same “Kamakura City Scenic District Ordinance” / Same “Historic Landscape Preservation Area / Historic Landscape Special Preservation District” / Same “Kamakura City Tsunami Hazard Map” / Same “Kamakura City Landslide Hazard Map”

Four Factors Unique to Kamakura City That Damage Buildings

From the characteristics visible in Kamakura City’s public documents, we have narrowed it down to four factors that are linked to large-scale repairs.

Source: Kamakura City “Kamakura City Tsunami Hazard Map”／Same “Kamakura City Landslide Hazard Map”／Same “Kamakura City Flood Hazard Map”／Same “Landscape Planning Notification Relations”

Key Points to Consider When Proceeding with Construction in Kamakura City

※Kakeru Koumuten has five bases in Yokohama City and serves the entire Kamakura area, including Kamakura, Ofuna, Koshigoe, Shichirigahama, and Tamagawa.

Signs of Deterioration Requiring Major Repairs and Timing

Generally, major repairs are estimated to occur 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 determination should be based on the condition of deterioration rather than just the number of years, so if you observe any of the symptoms listed below, we recommend an early on-site survey.

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

*The above are reference examples of 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” (Reiwa 6, June Revision, PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-scale Repair 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. The building had leaks occurring in several places, and we combined clear waterproofing for the tile exterior wall with roof waterproofing for the renovation.

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

Customer Feedback

Process from On-Site Survey to Completion of Work

From inquiry to completion of 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 smoother progression.

1. Contact Us (Free) Please reach out 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 roof, high places, and leak areas. For properties in Kamakura City, we will also check whether they are located near the station or along main roads, the distance to neighboring properties, the width of the road and delivery routes, pedestrian flow, drainage, rust on metal parts, and the parking lot.
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. Multiple plan proposals are also possible.
4. Plan Decision & Contract Confirm colors using color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to district planning, landscape planning, or building agreements, we will also explain the concepts of color selection.
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, we will coordinate this at this stage.
6. Temporary Scaffold Installation & Various Works Our in-house scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → metal and accessory 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 paint used, and a warranty certificate.
8. Aftercare Maintenance 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, Approval for Additional Work, Inspection Reports

Equally important as the construction itself is “when, what, and with what materials will 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 estimated amount that will require approval before signing 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 restrictions on daily life while scaffolding is in place. Most troubles can be prevented by providing advance 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 Kamakura City, 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 project achievements. If they provide detailed explanations of repair contents with photos, it offers reassurance as a reference when you actually request work.

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

Large-scale renovation work involves not only the construction itself but also potential troubles with residents and nearby neighbors, so it is necessary to report 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 renovation company, make sure to check for warranties. If any issues such as leaks occur after construction, having a leak warranty from the contractor ensures that repairs can be done at no cost, providing peace of mind! A company that offers a warranty is a sign of confidence in their work, making it a criterion for selecting a contractor.

Warranty periods vary by contractor and the type of work, but typically range from 1 to 10 years. Emergency repairs or partial fixes often do not come with a leak warranty. Some contractors also 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 yearly inspections. We also provide simple repairs such as partial sealing at no charge.

Obtain estimates from multiple contractors (at least 3 companies)

When requesting large-scale renovations, be sure to obtain estimates from multiple contractors. It is important to get estimates from at least 3 companies and compare their estimates and reports! Even for the same type 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, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repairs and exterior wall painting,” and “confirmation of the process” in detail! If the quality of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work can be difficult to assess from appearance alone, be sure to check whether the repair method is appropriate for the condition of the substrate!

Check this on the estimate (checklist)

Check if it is managed in-house

Large-scale repair work includes various tasks such as “substrate repair work,” “exterior wall painting,” “waterproofing work,” and “pipe replacement,” and the plan content will change based on the actual deterioration condition and customer preferences.

In cases where a contractor completely outsources to subcontractors, they may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or unnecessary work. If you investigate and then request a subcontractor, it may incur additional time and costs. By managing in-house with knowledge and experience, responsible construction can be achieved at a reduced cost.

Moreover, contractors that outsource may also have delayed responses in case of any troubles during construction. It is safer to avoid having a company that has not directly consulted 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 as follows:

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 payment orders for a total of 1.63788 billion yen to 37 companies regarding large-scale renovation work commissioned by condominium management associations in the Kanto region to design consulting firms (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 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 yourself.

Kamakura City Large-Scale Repair Frequently Asked Questions

How much does large-scale repair in Kamakura City 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 costs), with the most common being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, the cost for a two-story wooden apartment is approximately 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment it is around 4,000,000 to 9,000,000 yen, and for small-scale apartments or mixed-use buildings, it ranges 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 needed, 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 a guideline, 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, tile lifting, or breakage of the waterproof layer is observed, it is better to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. Buildings that are older tend to have a greater proportion of tile repairs and steel part replacements during the second and third repairs.

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

For apartments, it typically takes 3 weeks to 2 months, for small-scale apartments or buildings it takes about 1.5 to 3 months, and for apartments with over 50 units, it takes around 4 to 6 months. Residents can remain in their homes during the construction. However, while scaffolding is in place, there will be restrictions on drying laundry outside and opening windows, so we take thorough measures to minimize the impact on daily life, such as distributing advance notices, providing information on the schedule and laundry through bulletin boards, and strictly adhering to work hours.

How long should we expect from starting the planning to completing the construction?

For management associations, it typically takes about 1 to 1.5 years for establishing the 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 around 2 years to proceed comfortably. If using subsidies or tax incentives, please also factor in the time required to obtain management plan certification (which requires prior confirmation and a resolution at the general meeting).

Are there any subsidies available for large-scale repairs in Kamakura City?

There were no confirmed subsidies for large-scale repair work itself from publicly available information for either Kamakura City or Kanagawa Prefecture. However, for condominium apartments, if certain conditions are met, a reduction in fixed property tax under the “Condominium Longevity Promotion Tax System” (one-third reduction in Kamakura City) can be utilized. The city offers subsidies for seismic diagnostics of condominiums, and Kanagawa Prefecture provides free dispatch of condominium advisors and a management plan certification system. If the work includes windows and insulation, it may be eligible for “Advanced Window Renovation 2026” or “Future Eco Housing 2026.” The application timing and applicants vary by system, so please check the eligibility conditions and application procedures for each system before contracting or starting work.

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

Yes, it is true if the conditions are met. Under the Condominium Longevity Promotion Tax System, if a condominium built over 20 years ago with more than 10 units conducts large-scale repairs that contribute to longevity (for the second or subsequent repairs), the fixed property tax for the floor area up to 100 square meters per unit will be reduced by one-third for the fiscal year following the completion of the work (urban planning tax is not included). This applies to work completed between April 1, 2023, and March 31, 2027, and a declaration must be made within three months of completion. The declaration should be submitted to the Kamakura City Asset Tax Division (phone 0467-61-3931). The requirements include being a certified management plan condominium or a management association that has received advice and guidance, and preparations such as raising repair reserve funds may take time, so it is recommended to start the process more than a year before the work.

Are there any changes to subsidies starting from the fiscal year 2026?

Yes, there are. The national “Child-Rearing Green Housing Support Project” has been abolished and reorganized into the successor “Future Eco Housing 2026 Project.” Management associations and management association corporations can also become joint project participants, allowing for insulation renovations in common areas. Additionally, the “Long-Term Quality Housing Renovation Promotion Project” will end in fiscal year 2025, and it will not be implemented in fiscal year 2026. The “Advanced Window Renovation 2026 Project” has begun accepting bulk applications for apartment buildings starting from May 29, 2026 (the application process is handled by registered contractors). Please be careful not to base your financial planning on outdated information.

相見積もりは3社以上取ることをお勧めします。複数の業者から見積もりを取得することで、価格やサービス内容の比較ができ、適正な価格での契約が可能になります。また、各社の提案を比較することで、工事の質や信頼性についても判断しやすくなります。翔工務店では、他社との比較を行うためのサポートも提供していますので、お気軽にご相談ください。

最低3社をおすすめします。多すぎると比較しきれず、少なすぎると競争が働きません。大切なのは社数よりも「同じ土俵を作ってから比べること」です。共通の仕様書や数量表を作って同一条件で依頼し、「一式」表記を認めず内訳明細を必須にすると、金額差が範囲の違いなのか単価の違いなのかがはっきりします。

What is the difference if we have our own scaffolding?

In large-scale repair projects, temporary construction accounts for about 20% of the total cost (according to the Ministry of Land, Infrastructure, Transport and Tourism’s FY2021 survey). By not outsourcing scaffolding work, we can easily 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 approximately 100 single-family homes and plans scaffolding on-site according to the site conditions.

Can I just have the estimate even though I’m in the middle of comparing quotes?

Of course, that is 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 or 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. The availability of subsidies for investigation and removal costs in cases where sprayed asbestos is present may vary by year, so please check in advance with the city’s responsible office. We will also provide guidance from the investigation stage.

What happens if large-scale repairs are not done?

There are risks such as personal injury accidents due to falling exterior wall tiles, structural deterioration from rusting rebar, leaks, and a decrease in asset value. Furthermore, for buildings subject to regular reporting under Article 12 of the Building Standards Act, investigations using full tapping and other methods are required under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovations for tiled or mortar-finished walls. In Kamakura City, regular reports are handled by the Building Guidance Division, and according to the city’s regular reporting materials, joint housing is limited to “service-equipped housing for the elderly.” Mixed-use buildings, including stores, require individual confirmation (Kamakura City Building Guidance Division Phone 0467-23-3000). Even if not subject to statutory investigations, regular inspections and maintenance are essential, so please consult us if you are unsure about your judgment.

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 estimated to be between 2 million and 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it is estimated to be between 4 million and 9 million yen, based on our company’s track record (including scaffolding, substrate repairs, exterior wall painting, sealing, and waterproofing). It is common for apartments to undergo repairs every 10 to 15 years. For owners, there is an increasing trend to change the appearance through color simulations during repairs to improve occupancy rates.

If you are looking for a large-scale repair contractor in Kamakura City, contact Kakeru Koumuten Co., Ltd.

Our company is based in Yokohama City and has handled many exterior wall renovations and large-scale repairs for condominiums and apartments in Kamakura City. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. In urgent cases such as leaks, emergency measures may be possible, so please feel free to consult us. “I want it to last long 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 roofing and exterior wall painting, all work is performed by our own team. We are confident that we will not lose in terms of cost, quality, and scheduling compared to other companies, so we welcome comparative estimates!

Large-Scale Repair Work Service Area

Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.

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