Leave the repairs and renovations of condominiums and apartments in Hayama Town, Miura District, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!

Large-scale Repairs for Condominiums, Apartments, and Buildings in Hayama Town

Large-scale repair work that can be handled in Hayama Town

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.

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, we conduct free on-site surveys to confirm the following 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 Hayama Town

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

1. Equipment Specialized for Exterior Renovations

At Kakeru Koumuten, we have prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior wall painting and waterproofing work for large-scale renovations. We have established five bases centered around Yokohama City for material storage and showrooms.

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale renovations and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs associated with 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 for swift responses in emergencies!

In-house Waste Sorting

Large-scale renovations generate various types of waste, including leftover paint, metal, and wood. At Kakeru Koumuten, we sort and recycle waste in-house, leading to cost reductions in waste disposal.

Showroom Dedicated to Exterior Renovations

In the showroom, you can not only have meetings but 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 ensuring 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. Acquisition of Various Permits and Skilled Workers

We have obtained construction industry 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 work 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 as well.

4. Warranty and Aftercare

Most large-scale repair works, including “painting work,” “substrate repair work,” and “waterproofing work,” come with a warranty!
Aftercare is available every year, and we send out notification DM each year.

5. Flexible and Prompt Response

Our company is equipped to handle various troubles and situations related to apartments and condominiums.

We can also address exterior walls and rooftops that cannot be checked from high places by utilizing 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. Human Resource 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 each staff member can respond effectively. We also educate on points to pay attention to and areas to check during each phase 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 we also set up notice boards at entrances to display progress charts and announcements! Additionally, we ensure that the manners of visitors are thoroughly educated to minimize inconvenience to residents and neighbors.

8. Strict Quality Control

Each phase is inspected by a responsible person, and detailed construction photos are taken. We use film thickness inspection equipment and check sheets to ensure that there are no oversights in inspections. During exterior wall painting and waterproofing work, we check the quantity of used paint cans to confirm that the specified amount of paint is used, and we prevent construction defects by ordering paint in-house. 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 actual photos of your apartment or building!You can also perform the simulation on your smartphone or computer. By simulating and then changing to a two-tone color or making an image change, we hope to help enhance the stylish appearance and increase occupancy rates! Of course, we can also arrange color samples for actual color confirmation.

*Hayama Town is a designated scenic area throughout the town, and there are also scenic districts within the town. If you wish to change the color of the exterior walls, it is necessary to check the regulations for each area in advance. Having a color simulation screen will make explanations at community meetings and general meetings proceed smoothly.

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 using accent materials such as cornices and louvers
・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.

Estimated costs for large-scale repairs in Hayama Town

The cost of large-scale repairs varies greatly depending on the size of the building, its condition, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s estimates based on past projects categorized by size, and finally to examples of unit prices for each type of work.

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 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 costs, so they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Repair Work for Condominiums” (200 companies, 818 cases) *The amounts do not include consumption tax or common temporary costs. The 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 “FY 2021 Survey on Large-Scale Repair Work for Condominiums” (second survey of large-scale repair work. Overall average is construction-related 59.0%, temporary work 22.3%, miscellaneous expenses 9.9%). *The total may not equal 100% because it includes equipment-related work, exterior works, and others. This is an average value and not a criterion for judging the appropriateness of individual estimates.

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

*The above estimates are based on Kakeru Koumuten’s construction records and may vary depending on the presence of roofing work, metal work, plumbing, etc. For apartments, please also use the national statistics above (750,000 – 1,500,000 JPY per unit) multiplied by the number of units as a reference.

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

The estimate for large-scale repairs is broadly divided into “temporary structures,” “substrate repair,” “sealing,” “exterior painting,” “waterproofing,” and “miscellaneous expenses.” Before comparing total amounts, please check what each item includes, how much, and at what cost.

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 = correct” is not always true. 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. The rate of deterioration differs for each side due to location, sunlight exposure, and ventilation, so confirming the condition of each side through an on-site survey and selecting paint suitable for the location can change durability.

Guideline for Repair Reserve Fund and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the guideline for repair reserve funds as a monthly amount 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 of condominiums for the fiscal year Reiwa 5, 36.6% of management associations responded that “the repair reserve fund is insufficient compared to the plan.” When there is a shortfall, there are four main options.

Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Hayama Town

In both Hayama Town and Kanagawa Prefecture, there was no publicly available information confirming subsidies specifically for large-scale renovation work (there are support systems related to condominium management in the prefecture). The types that can be used are broadly divided into the following four categories. The eligibility and application status of the systems may change even during the fiscal year, so please be sure to confirm with our company or each contact point before contracting or starting work.(As of October 8, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs (including 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 the equivalent of 100㎡ per unit). In Hayama Town, the property tax for the following year for eligible properties will be reduced to one-third.

* The reporting destination is the Tax Division of Hayama Town Hall (Representative 046-876-1111). For management plan certification and advice/guidance, please confirm with the Kanagawa Prefecture contact window before the work.

② Kanagawa Prefecture’s Condominium Management Support (Management Associations should start here)

Both Hayama Town and Kanagawa Prefecture have not confirmed any subsidies for the actual costs of large-scale repair work. For consultations and planning by management associations, the prefecture’s support system can be utilized.

Source: Kanagawa Prefecture “Advisor Dispatch to Condominium Management Associations” / Hayama Town “Subsidy and Grant System for Housing Renovations”

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

Based on the national system, Hayama Town is certified by Kanagawa Prefecture. Upon receiving certification, there are interest rate benefits for the “Condominium Common Area Renovation Loan” from the Japan Housing Finance Agency and Flat 35 (Maintenance Preservation Type), which also relates to one of the requirements for the Long Lifespan Promotion Tax System (certification alone does not guarantee tax reduction). The certification requirements consist of 16 items from the national “Standards for Condominium Management.” The main criteria include holding general meetings at least once a year, establishing management regulations, separate accounting for management fees and repair reserves, ensuring that the total amount of arrears for more than three months is within 10% of the total, and “having a long-term repair plan that includes large-scale repair work twice or more and is created or reviewed within 7 years, with a planning period of 30 years or more.” Applications can be made directly to the Prefectural Housing Planning Division or through the “Management Plan Certification Procedure Support Service” of the Public Interest Incorporated Foundation Condominium Management Center for prior confirmation before proceeding with that system.

* There is currently no application fee for the prefecture. If using the Condominium Management Center’s system, a system usage fee (10,000 yen) and a separate examination fee for prior confirmation by a condominium management consultant will apply. Please check the latest conditions on the prefecture’s page.

④ National Energy Conservation Support | Housing Energy Conservation 2026 Campaign

Changes for Fiscal Year 2026The “Child-Rearing Green Housing Support Project” for Fiscal Year 2025 has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Additionally, the “Long-Term Excellent Housing Renovation Promotion Project” will end in Fiscal Year 7 and will not be implemented in Fiscal Year 8. Please be careful not to establish financial plans based on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Applications for Fiscal 2026 have ended)

* The Existing Housing Energy Saving Renovation Subsidy does not cover 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, it 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 Hayama Town

Hayama Town is located at the base of the Miura Peninsula in Kanagawa Prefecture, facing Sagami Bay. Known as a residential area blessed with sea and greenery, the town has two scenic districts, and the entire town is designated as a landscape planning area. Due to the presence of different environmental areas such as coastal areas, hilly and valley slopes, and along major roads like National Route 134, the way buildings deteriorate, the method of scaffolding, and the necessary procedures before construction vary depending on the location.

Source: Hayama Town “Statistical Information” / Kanagawa Prefecture “Preliminary Results of the 2025 National Census” / Hayama Town “Location and Area” / Same “Hayama Town Scenic District” / Same “District Planning Status” / Same “Hayama Town Landscape Plan”

Buildings in Hayama Town are divided into “four types”

In Hayama Town, the rules regarding terrain and appearance differ by location, so not only the age of the building but also the location of the building (coastal areas, along major roads, scenic districts, districts with planning, hilly and valley slopes) will affect the scale of repairs and procedures required for the next major renovation. Please check which type your building falls under.

Source: Hayama Town “Disaster Prevention Related Map”／Same “Hayama Town City Planning Ordinance”／Same “Hayama Town Scenic Area”／Same “District Planning Formulation Status”／Same “Hayama Town Landscape Plan”

Four Factors Unique to Hayama Town That Damage Buildings

From the characteristics visible in Hayama Town’s public documents, we have narrowed it down to four factors that lead to large-scale repairs.

Source: Hayama Town “Disaster Prevention Related Map”／Same “Hayama Town Landscape Plan”／Same “Hayama Town Scenic District”／Same “Hayama Town City Planning Ordinance”

Key Issues to Consider When Proceeding with Construction in Hayama Town

* Kakeru Koumuten Co., Ltd. has five locations in Yokohama City and serves all areas of Hayama Town, including Isshiki, Kamiyamaguchi, Kikoniwa, Shimoyamaguchi, Nagara, and Horiuchi.

Signs of Deterioration and Timing for Major Repairs

Generally, major repairs are recommended every 12 to 15 years. According to a survey by the Ministry of Land, Infrastructure, Transport and Tourism, the actual repair cycle is most commonly 13 years, with about 70% falling within 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 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 Part (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 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 Fiscal Year 2021”

Examples of Large-Scale Renovation Work

This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten Co., Ltd. The building had leaks occurring in several places, and it was renovated by combining clear waterproofing of the tile exterior walls and waterproofing of the roof.

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

Customer Feedback

Flow from On-site Investigation to Completion of Construction

From inquiry to completion of construction and aftercare, one representative will consistently handle your case. In the case of management associations, a resolution at the general meeting is required, so starting the process 1 to 1.5 years before the desired start date will allow 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 waterproof layers, and if necessary, investigate the roof, high places, and leak areas using drones or thermal imaging. For properties in Hayama Town, we will check if they are along the coast or on a slope, whether they are near main roads or residential areas, the distance to neighboring properties, the width of the road and delivery routes, pedestrian traffic, drainage, rust on iron parts and fittings, 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 plans can also be proposed.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for the general meeting. In areas subject to landscape planning, scenic districts, or district planning, we will also explain the considerations for 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, adjustments will be made at this stage.
6. Temporary Scaffold Installation & Various Works Our own scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → iron parts & ancillary work in that order. A supervisor 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, 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 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 the contract.

What Will Life Be Like During Construction? Impact on Residents

Large-scale repairs are principally conducted while residents remain in their homes. However, there will be restrictions on daily life while scaffolding is in place. Most troubles can be avoided 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 Hayama Town, and you may be unsure which one to choose. When requesting renovations for apartments, condominiums, or buildings, please check the following four points.

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 contents with photos, it can give you peace of mind as a reference when you actually request their services.

Using ratings from Google and review sites can be effective when comparing large-scale repair contractors!Be cautious if there are many negative reviews. If there are few reviews, also check the construction track record, content of explanations, 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 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 repair company, make sure to check forwarranties. If any issues such as leaks occur after construction, having a leak warranty from the contractor ensures that repairs can be made at no cost, providing peace of mind! Companies that offer warranty periods can be seen as having confidence in their work, which can serve as a criterion for selecting a contractor.

Warranty periods vary by contractor and type of work, but 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 checkif warranties and aftercare services are available.

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 free of charge.

Obtain estimates from multiple contractors (at least 3 companies)

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

When comparing estimates, consider not only the costs but also the “items in the estimate,” “methods and materials for substrate repairs and exterior painting,” and “confirmation of the process.” Be thorough in your comparisons! If the quality of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repairs can be difficult to assess from appearance alone, make sure to verify whether the proposed repair methods are suitable for the condition of the substrate!

Check these points on the estimate (checklist)

Check if it is managed in-house

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

There are cases where contractors that completely outsource to subcontractors lack knowledge and experience, leading to proposals for repairs in irrelevant areas or unnecessary work. If you request a subcontractor after investigation, it may incur additional time and costs. By managing in-house with knowledge and experience, responsible construction can be performed at a reduced cost.

Additionally, contractors that outsource may have delayed responses in case 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 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).

※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 Appropriateness of Ordering 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 Hayama Town

How much does large-scale repair in Hayama Town 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 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 condominiums 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 required, so we will provide an estimate through a free on-site survey.

How often should large-scale repairs be conducted?

Generally, a cycle of 12 to 15 years is recommended, and the actual cycle is most commonly 13 years according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, with about 70% falling within the 12 to 15-year range. However, the decision should be based on the condition of deterioration rather than just the number of years. If there are signs of deterioration in the sealing, lifting of tiles, or breakage of the waterproof layer, it is better to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. Older buildings tend to have a higher proportion of tile repairs and iron part replacements in the second and third repairs.

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

For apartments, the period is approximately 3 weeks to 2 months, for small condominiums or buildings it is about 1.5 to 3 months, and for condominiums with over 50 units, it typically takes 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 notices before construction, providing information on the schedule and laundry through bulletin boards, and strictly adhering to working 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 the establishment of the repair committee, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed comfortably. If you are using subsidies or tax incentives, please also factor in the time required to obtain management plan certification (which requires prior confirmation and general meeting resolution).

Are there any subsidies available for large-scale repairs in Hayama Town?

There were no confirmed subsidies specifically for large-scale repair work from Hayama Town or Kanagawa Prefecture based on publicly available information. However, if it is a condominium, a reduction in fixed property tax under the “Condominium Longevity Promotion Tax System” can be used if the requirements are met (in Hayama Town, the reduction is one-third for the following fiscal year). Kanagawa Prefecture offers free advisory services to management associations and has 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 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 meets the criteria (such as being over 20 years old and having more than 10 units) conducts large-scale repairs that contribute to longevity (for the second and subsequent repairs), the fixed property tax for the following year can be reduced to one-third for up to 100 square meters per unit (urban planning tax is not included). The eligible period is for 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 Tax Division of Hayama Town Hall (Representative 046-876-1111). The requirements include being a condominium that has received management plan certification or a management association that has received advice and guidance, and since it takes time to prepare for increases in repair reserve funds, 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?

Yes. The national “Childcare 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 Excellent 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 collective housing starting from May 29, 2026 (the application process will be handled by registered contractors). Please be careful not to base your financial planning on outdated information.

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

自社で足場を持つことで、工事のスケジュール管理が容易になり、迅速な対応が可能です。また、外部業者に依頼する場合と比べてコストを抑えることができ、品質管理も自社で行えるため、安心して工事を進めることができます。さらに、足場の設置や撤去にかかる時間を短縮できるため、工事全体の効率が向上します。翔工務店では、自社の足場班が現場を確認し、最適な足場の設置を計画します。

Approximately 20% of the costs for large-scale repair work are attributed to temporary construction (according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey). By not outsourcing scaffold work, we can easily control costs in this area, and our in-house scaffold team can flexibly respond to sudden changes or additional work. Kakeru Koumuten Co., Ltd. owns scaffold materials for about 100 single-family homes and plans scaffolding on-site according to site conditions.

Can I just have a look at the estimate while I’m in the process of getting multiple quotes?

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 multiple quotes.

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 such as asbestos work supervisors and building material asbestos surveyors, and we handle everything from the legally mandated preliminary surveys to the roof overlay method and removal of asbestos-containing roofing materials. The availability of subsidies for investigation and removal costs in cases of sprayed asbestos may vary by year, so please check in advance with the town’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 rebar corrosion, leaks, and a decrease in asset value. Furthermore, for buildings subject to periodic reporting under Article 12 of the Building Standards Act, investigations through full probing 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. The periodic reporting for Hayama Town is overseen by Kanagawa Prefecture, and submissions are made to the Kanagawa Prefectural Building Safety Association. Whether or not collective housing is included, as well as the treatment of mixed-use buildings including stores, requires individual confirmation (Kanagawa Prefecture Building Safety Division Phone: 045-210-6257). 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 wooden two-story building with 6 to 10 units, the estimate is between 2 million and 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it ranges from 4 million to 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 using color simulations during repairs to improve occupancy rates.

If you are looking for a large-scale repair contractor in Hayama Town, 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 Hayama Town. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. In urgent cases like 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 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 scaffold work to roofing and exterior wall 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 multiple quotes!

Large-Scale Repair Work Service Area

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

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