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

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

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

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 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 and compile a deterioration diagnosis report with photos, after which we will propose the scope of work.

Reasons Why Kakeru Koumuten is Chosen for Large-Scale Renovations in Ebina City, Kanagawa Prefecture

The reason why we can be entrusted with large-scale renovations in Ebina 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 exterior wall painting and waterproofing work for large-scale renovations at low cost and high quality. 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 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 canprocure materials at a lower cost! Additionally, since we always have stock available, we can provide speedy responses in emergencies!

In-house Sorting of Waste Materials

In large-scale renovations, various waste materials such as waste paint, metal, and wood are generated. 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, 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 insulation tests 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.

From inquiry to project completion, everything is managed by Kakeru Koumuten in a consistent system, allowing for high-quality large-scale repairs at reduced costs. 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 repair, waterproofing work, and tile repairs with complete in-house construction! Those with specialized knowledge and experience conduct inspections and actual construction for each process!

3. Obtaining Various Permits and Skilled Workers

We have obtained construction industry permits and permits for industrial waste collection and transportation! We also have national certified sheet metal and painting skilled workers on staff, giving us confidence in our construction techniques. We can also handle large-scale roofing work for factories! We have qualified personnel for asbestos work supervisors and building material asbestos surveyors, 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 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 in 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 improvement and conduct practical training. Since different sites require various processing and techniques, we regularly provide skill enhancement education to ensure that each staff member can respond appropriately. We also educate on points to pay attention to 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 process will be inspected by a responsible person, and detailed construction photos will be taken. We will use a film thickness inspection machine and check sheets to ensure that there are no oversights during inspections. When performing exterior wall painting or waterproofing work, we will check the number of used paint cans to confirm that the specified amount of paint has been used, and we will order paint directly from our company 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!You can also perform the simulation on your smartphone or computer. By simulating and then applying a two-tone color or making an image change, 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.

* In Ebina City, the entire area is designated as a landscape planning zone, and color standards for exterior walls and other elements are established based on classifications such as urbanization areas and urbanization adjustment areas. When deciding on colors, it is also necessary to check for the presence of landscape town planning districts, district plans, and building agreements. Having a color simulation screen allows for smooth 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 being considered and conduct trial painting on your exterior wall. By performing 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 when metal siding is applied
・Simulation for when accent materials such as cornices and louvers are used
・Simulation for roof painting and roof replacement work

With 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 Ebina 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 official statistics, then to our company’s cost estimates based on past performance by scale, and finally to examples of unit prices for each project.

The national average for condominiums is 750,000 to 1,500,000 yen per unit

According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which compiled 818 construction 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. 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 construction 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 aggregation of large-scale renovation work. Overall average is construction-related 59.0%, temporary construction 22.3%, miscellaneous expenses 9.9%). *The total does not equal 100% because equipment-related work, exterior works, and others are included. This is an average value and is not a criterion for judging the appropriateness of individual estimates.

Cost Estimates by Building Size (Scaffolding, Substrate 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 apartments, please also consider the amount calculated by multiplying the national statistics (750,000 – 1,500,000 JPY per unit) by the number of units as a guideline.

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

The estimate for large-scale repairs is broadly divided into “Temporary Works,” “Substrate Repairs,” “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 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 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 based on sunlight, location, and substrate condition. Choosing paints with anti-algae and anti-mold properties can change durability in shaded and humid areas.

Guidelines for Repair Reserve Funds and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the estimated repair reserve fund on a monthly basis per unit 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 fund is insufficient compared to the plan.” There are four main options when there is a shortfall.

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

As of the official website of Ebina City and Kanagawa Prefecture, there are no subsidies specifically for large-scale renovation work confirmed. The available options can be broadly categorized into the following five types. The eligibility and application status of these systems may change even during the fiscal year, so please be sure to confirm with our company or 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 (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 following year will be reduced by one-third (up to the equivalent of 100㎡ per unit; urban planning tax is not included). The reduction rate is determined by local ordinances, and Ebina City is one-third.

② Management Plan Certification System (Entry for Tax and Interest Benefits)

This is a system certified by Ebina City. Once certified, it leads to interest benefits on loans and bonds from the Japan Housing Finance Agency, as well as meeting one of the requirements for the long-life promotion tax system (certification alone does not result in tax reductions). The city’s operation will start in October 2024, and the certification standards comply with national standards (Ebina City does not have its own standards). The main criteria include holding meetings at least once a year, organizing management regulations, separate accounting for management fees and repair reserves, having no more than 10% of the total amount in arrears for repair reserves for more than three months, and “having created or reviewed a long-term repair plan that includes large-scale repair work twice or more within 30 years, within the last seven years”, among others.

*Ebina City added the “Condominium Management Improvement Promotion Plan” to the Housing Master Plan in March 2024 and signed an agreement with the Kanagawa Prefecture Condominium Management Association in October 2024 regarding the promotion of proper management of condominiums.

③ Support for Condominiums in Ebina City (Consultation, Advisors, Earthquake Resistance)

This is not a system that subsidizes the costs of large-scale repair work, but consultation on the review of long-term repair plans and repair reserve funds can be helpful in the preliminary stages of construction.

④ National Energy Saving Support | Housing Energy Saving 2026 Campaign

Changes for the 2026 Fiscal YearThe “Child-Rearing Green Housing Support Project” from the 2025 fiscal year 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 the 2026 fiscal year and will not be implemented in the 2027 fiscal year. Please be careful not to establish financial plans based on outdated information.

Future Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

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

* The prefectural existing housing energy efficiency renovation subsidy does not cover common areas of rental apartments or units not occupied by the owner. The city’s subsidy program has conditions for the contractors (such as registration with the city and membership in the Chamber of Commerce). Kakeru Koumuten Co., Ltd. will provide guidance on whether it can qualify as a contractor based on the conditions of each program.

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Ebina City, Kanagawa Prefecture

Ebina City is located in central Kanagawa Prefecture, covering an area of 26.59 km². According to the national census, the population surged from 17,938 in 1960 (Showa 35) to 59,783 in 1975 (Showa 50), and then to 93,159 in 1985 (Showa 60) after the city was established in 1971 (Showa 46). By 2020 (Reiwa 2), the population reached 136,516. The population has continued to grow, and it is characterized by a mix of buildings ranging from over 40 years old to newly constructed ones.

Source: Ebina City Website (Population and Number of Households) / Statistics Ebina Reiwa 7 Edition “Population” (Table 1) / Same “National Census” (C-9・C-15) / Same “Land and Weather” (A-4)

Housing in Ebina City is divided into “four layers”

According to the 2020 National Census, out of 57,581 households in Ebina City, 27,757 were single-family homes (about 48%), and 29,309 were multi-family residences (about 51%). The table below shows the construction periods of all housing in the city, including single-family homes, based on the 2023 Housing and Land Statistics Survey, alongside population trends. The type of major repairs required for your building will vary depending on which layer it falls into.

Source: Statistics Ebina Reiwa 7 Edition “Population” (Table 1: Census, as of October 1 each year) / Same “Civil Engineering and Construction” (Table 10: Housing and Land Statistical Survey as of October 1, Reiwa 5) *The number of housing units is an estimate based on sample surveys and is rounded to the nearest ten units, so totals may not match. Since 2001, the total is for 2001–2005, 2006–2010, 2011–2015, 2016–2020, and 2021–September 2023. The age of the building is an estimate calculated from the construction period classification.

In Multi-Family Dwellings, Repair Issues Change by “Number of Floors”

According to the 2020 Census, among the 29,309 households in multi-family dwellings in Ebina City, about 60% were 5 stories or fewer, and about 40% were 6 stories or more. The figures represent the number of residential households, including rentals, not the number of buildings.

Source: Statistics Ebina Reiwa 7 Edition “Census” (C-9 Number of Households by Building Type)

Four Factors Affecting Buildings and Construction in Ebina City

Based on city statistics and public documents, we have organized four characteristics that lead to large-scale repairs. As it is an inland city away from the sea, the issues are more about temperature differences, rain, and water flow than salt damage.

Source: Statistics Ebina Reiwa 7 Edition “Land and Weather” (A-2・A-6・A-7)／Ebina City “Flood Inundation Risk Areas”・Disaster Prevention Guidebook (Hazard Map)／Ebina City Landscape Promotion Plan (PDF)・About the Landscape Promotion Plan／Ebina City “District Plans”・“Building Agreements”

Key Points to Consider When Proceeding with Construction in Ebina City

Source: Statistics Ebina Reiwa 7 Edition “Civil Engineering and Construction” (Table 4 Condition of Municipal Roads by Width) / Same “Land and Weather” (A-4 Area by Land Use) / Same “National Census” (C-15 Daytime and Nighttime Population) / Ebina City “Notification System Based on the Landscape Law and Ebina City Landscape Ordinance [Entire City]” *The percentages by width were calculated from the total length of municipal roads in Table 4 (private roads are not included).

*We accept consultations throughout the city of Ebina, including Izumi, Imazato, Ogi-cho, Otani, Kashiwagatani, Katsuse, Kamimaizumi, Kamigou, Kawaraguchi, Kokubunji-dai, Kokubun-minami, Kokubun-kita, Satsuki-cho, Shimomaizumi, Shakke, Sugikubo, Chuo, Nakashinden, Hamada-cho, Megumi-cho, and Bouchi.

Deterioration Symptoms and Timing Requiring Major Repairs

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

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

*The above is a reference example from the guidelines and is not a uniform construction deadline. 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 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 rooftop waterproofing for the renovation.

Exterior Renovation Work for Mixed-Use Building (Tile Wall Waterproofing + Roof 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 smoother progression.

1. Inquiry (Free) Please contact us via phone, form, or LINE. If you have estimates from other companies, just presenting them is fine.
2. On-site Investigation & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproof layers, and if necessary, investigate the rooftop, high places, and leak areas using drones or thermal imaging. For properties in Ebina City, we will also check the site conditions, trees, delivery routes, 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. Proposals for multiple plans are also possible.
4. Plan Decision & Contract We will confirm colors using color simulations, paint boards, 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 plans and building agreements.
5. Notification to Residents & Neighbors We will distribute construction notices, 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 the 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 and take construction photos for each stage.
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 the warranty.
8. Aftercare We will send out annual DM notifications, allowing for yearly inspections. 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 will provide materials and reports in the following four situations.

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

How Will Life Be During Construction? Impact on Residents

Major 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 by providing advance notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction begins.

How to Choose a Major Repair Contractor and Ordering Method

There are many major repair contractors that cover Ebina 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 Major Repairs

Major repair contractors often have websites that showcase their exterior renovation achievements. If they provide detailed explanations of repair work with photos, it can give you peace of mind as a reference when you actually request work.

Using Google and review sites to evaluate major 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 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 availability 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 demonstrate confidence in their work, making it a key criterion for selecting a contractor.

The warranty period varies by contractor and the nature of the work, but it is generally set between 1 and 10 years. Emergency repairs or partial repairs often do not come with a leak warranty. Some contractors offer aftercare services in addition to warranties, so be sure to check for the availability of 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, obtain estimates from multiple contractors. It is important to acquire estimates from at least 3 companies and compare their estimates and reports! Even for the same work, costs can vary by contractor, and warranties and aftercare services may differ. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repair and exterior wall painting,” and “confirmation of the process” to make a detailed judgment! 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, ensure that 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 based on the actual deterioration state and customer preferences.

Contractors that completely outsource 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 that keeps costs down becomes possible.

Additionally, contractors that outsource may also respond slowly in the event of any troubles during construction. It is safer to avoid having a company that has not actually met with the customer manage the construction. Kakeru Koumuten performs everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, with knowledgeable and experienced personnel managing the construction!

There are three ordering methods. The choice affects how the process proceeds.

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

Collusion and Improper Consulting Issues in Large-Scale Renovations and Self-Defense Measures

Latest 2026 In the large-scale renovation industry, improper 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 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 contractor 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 Ebina City, Kanagawa Prefecture

How much does large-scale repair in Ebina City, Kanagawa Prefecture 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 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 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 and roofing work is required, so we provide free on-site estimates.

How often should large-scale repairs be conducted?

Generally, the recommended cycle is every 12 to 15 years, 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 advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. In Ebina City, there are approximately 18,700 homes built before 1990 (according to the 2023 Housing and Land Statistics Survey, including single-family homes), and during the second and third repairs, there tends to be a greater focus on tile repairs, replacement of iron parts, and updating of 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 condominiums and buildings it is about 1.5 to 3 months, and for condominiums with more than 50 units, it is approximately 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, such as distributing advance notices, providing information on the schedule and laundry via bulletin boards, and strictly adhering to working hours.

How long should we expect from the start of planning to the completion of construction?

For management associations, it typically takes about 1 to 1.5 years for the establishment of the repair committee, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for the construction itself. 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 the general meeting, prior confirmation, and application to the city) will also take time, so please factor this into your timeline.

Are there any subsidies available for large-scale repairs in Ebina City, Kanagawa Prefecture?

As of October 9, 2026, there are no confirmed subsidies for large-scale repair work itself on the official websites of Ebina City and Kanagawa Prefecture. However, for condominium owners, if certain requirements are met, a one-third reduction in fixed property tax can be applied under the “Condominium Longevity Promotion Tax System.” One of the requirements for this tax system is the management plan certification, which is operated by Ebina City. If the work includes windows and insulation, it may be eligible for “Advanced Window Renovation 2026” or “Mirai Eco Housing 2026.” The city also offers subsidies for housing renovations, but the targets are individual residences (exclusive parts), and there are conditions for contractors as well. The timing of applications and applicants varies 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?

It is true if the requirements are met. 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 wall painting, floor waterproofing, and roof waterproofing) that contribute to longevity, the fixed property tax amount for the following year can be reduced by one-third for up to 100 square meters per unit (according to the reduction rate in Ebina City). This applies to work completed between April 1, 2023, and March 31, 2027, and an application to Ebina City (Finance Department, Property Tax Division) is required for the special exemption. The national system requires declaration within three months after the completion of the work. For management plan certified condominiums, there are also requirements such as raising the repair reserve fund, which can take time to prepare, so it is recommended to start the process more than a year before the construction.

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

There is. 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 fiscal year 2025, and it 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 low-urgency work based on a deterioration diagnosis to the next time, 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 apartment common area renovations 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. The elevation in Ebina City is approximately 11 to 84 meters, and about 73% of the city road extension is less than 6.5 meters wide (as of April 1, 2025). The height difference and delivery routes vary by building. Kakeru Koumuten Co., Ltd. owns its own 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 during the estimation stage.

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 lots. Kakeru Koumuten Co., Ltd. will coordinate with you, including checking the availability of nearby coin parking and monthly parking lots, starting 2 to 3 months before construction begins.

Can I freely decide the color of the exterior walls?

Ebina City is entirely within a landscape planning area, and color standards for exterior walls are established by categories such as urbanization areas and urbanization adjustment areas. Buildings over 10 meters in height or with a building area of 300 square meters or more are subject to notification for changes in exterior color (repainting in the same color does not require notification), and construction cannot begin until 30 days have passed since the notification. There are also areas with separate regulations, such as the Ebina Ogi Town Landscape Town Development District. In addition, there are 15 district plans and 8 building agreements published on the city’s page. Whether notification is necessary depends on the building and the nature of the work, so please confirm in advance with the Urban Planning Division, Urban Policy Section (046-235-9391). We will also check this during our investigation. 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 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 it with high-pressure washing and choosing paint with anti-algae and anti-mold properties, recurrence can be suppressed. We also recommend checking for blockages in roof drains and gutters caused by leaves and mud, as these can lead to puddles on the roof and leaks.

Which should I choose, the responsibility construction method or the 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, making it easier to compare under the same conditions. While the design supervision method allows for comparison of construction companies under the same conditions since a third party creates the specifications, consulting fees are incurred separately, and there are risks of conflicts of interest and collusion that need to be considered. Verification of price, specifications, and construction status is essential even with the responsibility construction method. Kakeru Koumuten Co., Ltd. provides estimates that clearly state quantities, methods, and materials for each construction item, allowing you to compare with other companies on the same level.

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 a neutral third party, keep minutes of the selection process, and include penalty clauses in the contract. On September 28, 2026, the Japan Fair Trade Commission announced exclusion orders and payment orders 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 “comparing after creating the same playing field.” By creating a common specification sheet and quantity table and requesting under the same conditions, and making detailed breakdowns mandatory without allowing “one set” notation, it becomes clear whether the price difference is due to differences in range or unit price.

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 fiscal year 2021 survey). By not outsourcing scaffolding work, it is easier to control costs in this area, and our own 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 areas with height differences or narrow front roads.

I’m in the middle of getting estimates, but can I just have my estimate reviewed?

Of course, that’s possible. If you bring estimates from other companies, we will check whether the items, quantities, construction methods, and materials are appropriate for free and provide you with an estimate under the same conditions. We welcome competitive 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 asbestos work supervisors and building material inspectors for asbestos-containing materials, and we can handle everything from the legally required preliminary surveys to the cover method and removal of asbestos-containing roofing materials. The availability of municipal subsidies for the investigation and removal of sprayed asbestos varies by municipality, so please check with the Ebina City office.

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 periodic reporting under Article 12 of the Building Standards Act, investigations through comprehensive tapping, etc., are required under certain conditions, such as when the exterior wall has exceeded 10 years since completion or renovation. Ebina City is an area under the jurisdiction of Kanagawa Prefecture, and for collective housing, it is limited to service-equipped housing for the elderly. Mixed-use buildings, including stores, restaurants, hospitals, and hotels, may be subject to regulations depending on their location 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 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 exterior appearance using color simulations during repairs to improve occupancy rates.

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

We handle exterior wall renovations and large-scale repairs for apartments and condominiums in Ebina City, covering all of Kanagawa and Tokyo. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. “I want it to last long with one renovation” “I want to keep costs down as much as possible” “I want to improve insulation performance because the indoors are hot” We will propose the best solutions for your specific requests and future repair plans.

From temporary scaffolding work to roofing and exterior painting, all work is performed by our own team. We are confident that we won’t be outdone by others in terms of cost, quality, and efficiency, so we welcome comparative estimates!

Large-scale Repair Work Service Area

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

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