Leave the repairs and renovations of condominiums and apartments in Ashigarakami District, Kanagawa Prefecture (Nakai Town, Oi Town, Matsuda Town, Yamakita Town, Kaisei Town) to Kakeru Koumuten Co., Ltd.!

Large-scale Repairs for Condominiums, Apartments, and Buildings in Ashigarakami District (Nakai Town, Oi Town, Matsuda Town, Yamakita Town, Kaisei Town)

Large-scale repair work that can be handled in Ashigarakami District

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but a comprehensive repair of the entire building 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 from Building Diagnosis

It is not guaranteed that all of the above works will be carried out. 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 following and summarize it in a deterioration diagnosis report with photos, after which we will propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Ashigarakami District

The reason why we at Kakeru Koumuten Co., Ltd. can be entrusted with large-scale renovations in Ashigarakami District is partly because “Kakeru Koumuten has a base in Kanagawa Prefecture,” but also because of 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, since we always have stock available, we can provide rapid responses in emergencies!

In-house Waste Separation

In large-scale renovations, various waste materials such as leftover paint, metals, and wood are generated. At Kakeru Koumuten, we sort and recycle waste materials in-house, which helps reduce waste disposal costs.

Showroom Dedicated to Exterior Renovations

In the showroom, you can not only have meetings but also check actual samples and colors of exterior materials. You can also perform color simulations for exterior wall painting and check heat insulation properties using a heat insulation testing machine!

2. Cost Reduction through In-House Management and Construction

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

From inquiry to project completion, everything is managed by Kakeru Koumuten in a unified 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 fully handle everything from temporary scaffolding installation to exterior wall painting, substrate repairs, waterproofing work, and tile repairs with our own team! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. 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 craftsmen on staff, 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 manage and conduct preliminary surveys for asbestos-containing roofing materials.

4. Warranty and Aftercare

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

5. Flexible and Prompt Response

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

We can also address exterior walls and rooftops that cannot be inspected 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 promptly respond to urgent requests or emergencies!

6. Staff Development

Our staff create various models for skill enhancement and conduct practical training. Since different sites require various processing and techniques, we regularly provide skill enhancement education to ensure each staff member can respond appropriately. We also educate on points to pay attention to and areas to check during each stage of large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we will not only notify residents and greet nearby residents, but also install a 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. Thorough Quality Control

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

* In Yamakita Town, it is necessary to confirm the color concept in the landscape plan, and there are areas in other towns that have district plans and regulations. Having a color simulation screen allows for smooth explanations at community association and management union meetings.

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

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

9-3 Exterior Renovation Simulation

Exterior simulations for apartments and condominiums are also possible!
・Exterior wall color simulation (two-tone colors are also possible)
・Simulation for 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 image change! We hope that renovating the appearance of your apartment or condominium will help increase occupancy rates.

Cost Estimates for Major Repairs in Ashigarakami District

The cost of major repairs varies significantly depending on the size of the building, the degree of deterioration, the scope of work, and the materials used. First, refer to the national average based on public statistics, then to our company’s performance records based on size, and finally to unit price examples 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 collected 818 construction cases (FY 2021), about 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 the conditions differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in FY2021” (200 companies, 818 cases) *Amounts do not include consumption tax or common temporary costs. Percentages do not total 100% due to rounding and non-responses.

Breakdown of Construction Costs (What the Money is Spent On)

Source: Ministry of Land, Infrastructure, Transport and Tourism “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 22.3%, miscellaneous expenses 9.9%). *The total does not equal 100% because equipment-related work, exterior works, and others are included. This is an average value and not a criterion for judging the appropriateness of individual estimates.

Cost Estimates by Building Size (Scaffolding, Substrate Repair, Exterior Wall Painting, Waterproofing, Sealing as a Set)

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

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

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

Examples of Unit Prices for Repair Work

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

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

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

* The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. For shaded and humid areas, choosing paint with anti-algae and anti-mold properties can change durability.

Guidelines for Repair Reserve Funds and Options When Insufficient

According to the Ministry of Land, Infrastructure, Transport and Tourism guidelines, the guideline for repair reserve funds is indicated 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 Comprehensive Survey of Condominiums)

In the Reiwa 5 Comprehensive Survey of Condominiums, 36.6% of management associations responded that “the repair reserve fund is insufficient compared to the plan.” There are four main options when insufficient.

Subsidies, Tax Systems, and Loans to Check for Large-Scale Renovations in Ashigarakami District

In the five towns of Ashigarakami District, Kanagawa Prefecture, there are no subsidies specifically for large-scale renovation work. The available options can be broadly categorized into the following four 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 relevant offices before contracting or starting work. (As of October 9, 2026)

① Condominium Longevity Promotion Tax System (Reduction of Fixed Property Tax)

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 fixed property tax amount for the following year will be reduced. The reduction rate is a “local special exception” defined by the town within the national range (1/6 to 1/2, with the national reference standard being 1/3). Up to 100 square meters per unit is eligible, and urban planning tax is not included.

② Prefectural and Town Offices (Management Associations should start here)

The five towns in Ashigarakami District are under the jurisdiction of Kanagawa Prefecture for the certification of condominium management plans. The prefecture has established policies for the town and village areas in the “Kanagawa Prefecture Basic Housing Plan Chapter 5: Promotion Plan for Proper Condominium Management,” and the survey on the actual conditions of condominiums in the town and village areas for the fiscal year 2020 covered 153 cases across 14 towns and villages (including 87 resort condominiums and 66 others). The breakdown of the number of buildings and years built for just the five towns is not provided. While this is not a subsidy for the construction costs of large-scale repairs, it can be used as a reference for prior consultations and decision-making.

Source: Kanagawa Prefecture Basic Housing Plan Chapter 5: Promotion Plan for Proper Condominium Management (PDF)／Kanagawa Prefecture “Guide to Applying for the Condominium Management Plan Certification System” (PDF)

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

The system certified by Kanagawa Prefecture in the five towns of Ashigarakami District allows for certification, which meets one of the requirements for the Japan Housing Finance Agency’s “Flat 35” and interest rate reductions for condominium common area renovation loans, as well as the long-term life promotion tax system (certification alone does not guarantee tax reductions). The main criteria include holding general meetings at least once a year, maintaining management regulations, separate accounting for management fees and repair reserves, ensuring that arrears do not exceed 10% of the total, and “having a long-term repair plan that includes two or more large-scale repair works and is created or reviewed within seven years, with a planning period of 30 years or more.”

*Before applying, utilizing the support service for management plan certification procedures provided by the Public Interest Incorporated Foundation Condominium Management Center allows for a preliminary check by a condominium management specialist (a preliminary confirmation certificate will be issued if compliant). Certification is subject to renewal every five years. Please check the prefecture’s guide for application procedures.

④ National Energy Conservation Support | Housing Energy Conservation 2026 Campaign

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

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies and Support (Subsidy applications for the 2026 fiscal year have ended)

* The Existing Housing Energy Saving Renovation Subsidy does not cover common areas of rental apartments or units not occupied by the owner.

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

When a 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 Sumai-ru Loan” (Official)

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

Building Conditions and Repair Points in the 5 Towns of Ashigarakami District

The 5 towns of Ashigarakami District (Nakayama Town, Oi Town, Matsuda Town, Yamakita Town, and Kaisei Town) have significantly different topographies and building conditions in each town. Just looking at the area, Kaisei Town is 6.55 km², while Yamakita Town is 224.61 km² (as of April 1, Reiwa 4), showing a large disparity, so it cannot be generalized as “because it’s Ashigarakami District.” According to Kanagawa Prefecture’s plan, the prefecture is organizing condominiums in the town and village areas, including the 5 towns, and the actual survey for fiscal year Reiwa 2 targeted 153 cases in 14 towns and villages (87 resort condominiums and 66 others). Since the breakdown of the number of buildings and their ages by town has not been disclosed, it is important to assess based on the age and deterioration status of your own building.

Source: Nakayama Town・Oi Town・Matsuda Town・Yamakita Town websites (population and number of households)／Kaisei Town “Population and Number of Households by District” (as of September 1, Reiwa 8)／Kanagawa Prefecture Basic Living Plan Chapter 5 Condominium Management Improvement Plan (PDF)／Earthquake Research Promotion Headquarters “Kouzu-Matsuda Fault Zone”／Kanagawa Prefecture “Kanagawa Landscape”　*The reference date for population and number of households varies by town (Nakayama Town, Matsuda Town, and Yamakita Town is October 1, Oi Town is the end of August, and Kaisei Town is September 1).

Organizing the Differences Among the 5 Towns from a Repair Perspective

Each town has different “disasters and systems that are involved.” The table below summarizes only the items that can be confirmed from public documents. The circumstances for each building vary, so actual assessments will be conducted through on-site investigations.

Four Key Factors to Consider for Large-Scale Repairs Unique to Ashigarakami District

Instead of lumping it all together with “salt damage measures because it’s Kanagawa Prefecture,” we have organized four factors to keep in mind for large-scale repairs based on the terrain and town rules of Ashigarakami District. The circumstances for each building vary, so individual confirmation will be conducted through on-site investigations.

Source: Earthquake Research Promotion Headquarters “Long-term Evaluation of the Kouzu-Matsuda Fault Zone” / Kanagawa Prefecture “Kanagawa Landscape” (List of Landscape Administrative Organizations) / Kanagawa Prefecture Statistics (Area as of April 1, 2022) *The evaluation of the fault zone is from 2009 and may have been revised since then.

Points of discussion that are likely to arise in Ashigarakami District during construction

* Kakeru Koumuten has established five bases centered around Yokohama City and will visit Nakai Town, Oi Town, Matsuda Town, Yamakita Town, and Kaisei Town.

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 judgment should be based on the condition of deterioration rather than the number of years, so if you observe symptoms like those listed below, we recommend an early on-site inspection.

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

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

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Creating Long-Term Repair Plans” (Revised June 2024, PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on 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 from several locations, and we combined clear waterproofing for the tile exterior wall with waterproofing for the roof for the renovation.

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

Customer Feedback

Process 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 an exterior wall inspection, check for cracks, sealing, and waterproofing layers, and if necessary, investigate the rooftop, high places, and leak areas using drones or thermography. For properties in Ashigarakami District, we will also check the condition of retaining walls, slopes, trees, and access 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. Multiple plan proposals are also possible.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to Yamakita Town’s landscape plans or district plans, we will also explain the considerations for color selection.
5. Notification to Residents & Neighbors We will distribute construction notifications, conduct greetings to neighbors, 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 → 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.
8. Aftercare Maintenance We will send annual DM notifications, and annual inspections are possible. Simple repairs such as partial sealing are provided free of charge.

Resident Communication, Additional Work Approval, Inspection Reports

Just as 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 approximate amount that will require approval before the contract.

How Will Life Be During Construction? Impact on Residents

The principle of large-scale repairs is to proceed while you continue to live in your home. However, there will be some limitations on your daily life while scaffolding is in place. Most troubles can be prevented by providing prior notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction.

How to Choose a Large-Scale Repair Contractor and Ordering Method

There are many large-scale repair contractors that cover the Ashigarakami District, and you may be unsure which one to choose. When requesting renovations for apartments, condominiums, or buildings, please check the following four points.

Have Extensive Experience in Large-Scale Repairs

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

Using Google and review sites to evaluate large-scale repair contractors can also be effective when comparing them! 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 conflicts with residents and nearby neighbors. Therefore, it is necessary to post updates on the progress of the work and information about laundry, etc., on bulletin boards to prevent troubles before they occur. 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, make sure to check for warranty availability. If any issues such as leaks occur after the construction, having a leak warranty from the contractor ensures that repairs can be made at no cost, providing peace of mind! Companies that offer a warranty period are often confident in their work, making it a key criterion for selecting a contractor.

The warranty period varies by contractor and the nature of the work, but it typically ranges from 1 to 10 years. Emergency repairs or partial fixes often do not come with a leak warranty. Some contractors also provide aftercare services separate from the warranty, so be sure to check for warranty 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 responses for simple repairs such as partial sealing.

Obtain Estimates from Multiple Contractors (at least 3 companies)

When requesting large-scale repairs, be sure to obtain estimates from multiple contractors. It is important to get estimates from at least three companies and compare their quotes and reports! Even for the same 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 repair and exterior wall painting,” and “confirmation of the process” in detail! If the quality of auxiliary materials is low or if processes are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work is often not visible from the outside, ensure that the repair method is appropriate for the condition of the substrate!

Check These Points on the Estimate (Checklist)

Confirm whether it is managed in-house

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

If 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 request a subcontractor after investigation, it may incur additional time and costs. By having knowledge and experience and managing in-house, responsible construction can be carried out at a reduced cost.

Additionally, contractors that outsource may respond slowly in the event of trouble 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 installation to exterior wall painting and waterproofing work in-house, managed by knowledgeable and experienced personnel!

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 Consultant 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 been a long-standing issue. 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 to design consulting firms in the Kanto region (two design consulting firms were also subject to exclusion orders).

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

Three Typical Schemes

Source: Yokohama City “What is Collusion in Large-Scale Repair Work for Condominiums?” / Ministry of Land, Infrastructure, Transport and Tourism “On the Proper Ordering of Large-Scale Repair 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 specialists 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

Contact Points for Third-Party Consultation

If you are unsure about how to read estimates or proceed with vendor selection, consulting with a third party separate from the construction company can be effective. The main contact points available for management associations in Ashigarakami District are as follows.

Source: Kanagawa Prefecture “Guide to Applying for the Condominium Management Plan Certification System” (PDF) / Condominium Management Plan Certification Consultation Dial / Kanagawa Prefecture “Condominium Advisor Dispatch Project”

Frequently Asked Questions about Large-Scale Renovations in Ashigarakami District

How much does a large-scale renovation in Ashigarakami District cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey, about 70% of cases fall within the range of 750,000 to 1,500,000 yen (excluding consumption tax and common temporary construction costs), with the most common range being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, the estimated costs are 2,000,000 to 4,000,000 yen for wooden two-story apartments, 4,000,000 to 9,000,000 yen for three-story steel and RC apartments, and 5,000,000 to 15,000,000 yen for small condominiums and mixed-use buildings. Costs may vary 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 renovations be conducted?

Generally, a cycle of 12 to 15 years is recommended, and the actual cycle is most commonly 13 years according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, with about 70% falling within the 12 to 15-year range. However, the decision should be based on the condition of deterioration rather than just the number of years. If deterioration of sealing, tile lifting, or breaks in the waterproof layer are observed, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. The five towns in Ashigarakami District do not publish the breakdown of building ages by town, so we will assess the age and condition of your building during the on-site survey to make a judgment.

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

The estimated time is about 3 weeks to 2 months for apartments, 1.5 to 3 months for small condominiums and buildings, and about 4 to 6 months for condominiums with over 50 units. 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 on 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 (from the preliminary confirmation by the condominium management center to the certification by Kanagawa Prefecture).

Are there any subsidies available for large-scale renovations in Ashigarakami District?

There are currently no subsidies specifically for large-scale renovation work in the five towns of Ashigarakami District or Kanagawa Prefecture. However, if it is a condominium, you may be eligible for a reduction in fixed property tax under the “Condominium Longevity Promotion Tax System” if certain conditions are met (the percentage is determined by the town’s ordinance, with Matsuda Town offering one-third), and Kanagawa Prefecture provides free dispatch of condominium advisors. If the work includes windows and insulation, it may be eligible for “Advanced Window Renovation 2026” or “Mirai Eco Housing 2026.” Please check with the relevant department in each town to see if the town’s independently established subsidy system applies to the common areas of the condominium. The application timing and applicants differ by system, so please confirm the eligibility conditions and application procedures for each system before contracting and starting construction.

I heard that property taxes can be reduced with large-scale renovations. Is that true?

Yes, it is true if certain conditions 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 renovations that contribute to longevity (including exterior painting, floor waterproofing, and roof waterproofing), the fixed property tax for the following year will be reduced (up to the equivalent of 100 square meters per unit). The reduction percentage is set by the town’s ordinance within the national range (one-sixth to one-half), and a proposal has been made to the town council for Matsuda Town to set it at one-third. Please check with the tax departments of Nakai Town, Oi Town, Yamakita Town, and Kaisei Town for their respective percentages. The eligible renovations must be completed between April 1, 2023, and March 31, 2027, and a special application form must be submitted to the town’s tax department within three months of completion (as stipulated by the national system). For management plan certified condominiums, there are additional requirements such as raising the repair reserve fund, which takes time to prepare, so it is recommended to start the process more than a year before construction.

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

There are four main options. ① Postpone low-urgency work based on 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 renovation loans for common areas of condominiums do 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 regarding the decision to separate these tasks.

Can scaffolding be set up on sites with slopes or retaining walls?

Yes, it can. The five towns in Ashigarakami District include sites with slopes, steps, retaining walls, and embankments. Kakeru Koumuten Co., Ltd. owns its own scaffolding materials and has its own scaffolding team, allowing us to plan support and layout of the boards after confirming the site. This is a part where additional costs can easily arise after seeing the site, so it is important to confirm the delivery route during the estimation stage. We also check for deterioration of retaining walls and embankments and discuss whether they are included in the long-term repair plan.

What happens to the parking for residents during construction?

Vehicles on the side where scaffolding will be erected will need to be temporarily moved. In buildings where there is limited parking space on the premises, it may take time to secure an alternative parking location. Kakeru Koumuten Co., Ltd. will coordinate with you, including checking the availability of nearby parking, starting from 2 to 3 months before construction begins.

Can I freely decide the color of the exterior walls?

Among the five towns, only Yamakita Town is a landscape administrative organization, and the color of the exterior walls and the scale requiring notification can be confirmed in Yamakita Town’s landscape plan. Nakai Town, Oi Town, Matsuda Town, and Kaisei Town are not landscape administrative organizations, and according to Kanagawa Prefecture’s page, notification to the prefecture regarding landscape is not required. However, there may be areas with regulations based on district plans or town ordinances. Please check with the urban planning and building department of each town hall to see what applies to your property. We will also investigate this during our survey. Sharing a color simulation to visualize the completed image can facilitate discussions.

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

The north side receives less sunlight throughout the day, and when shadows from trees, mountains, or neighboring buildings overlap, moisture can accumulate, making it easier for algae, moss, and mold to thrive. This is more likely to occur in locations close to mountains or trees. By thoroughly cleaning with high-pressure washing and choosing paints with anti-algae and anti-mold properties, recurrence can be minimized. Additionally, we recommend checking for blockages in roof drains and gutters caused by fallen leaves, as these often lead to puddles on the roof and leaks.

Which method should I choose: responsibility construction method or design management 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 small to medium-sized buildings. The design management method allows for comparison of construction companies under the same conditions since a third party creates the specifications; however, consulting fees are incurred separately, and there are risks of conflicts of interest and collusion. Verification of price, specifications, and construction status is essential even in 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 tactics. ① Pre-determining the contractor and having other companies submit only formal high estimates, known as “dummy estimates,” ② A consultant contracts at an extremely low design management fee and receives kickbacks from partner companies, creating collusion, ③ Adding a portion of the contract amount as a back margin to the construction costs. Countermeasures include obtaining independent estimates, consulting with a neutral third party, keeping minutes of the selection process, and including penalty clauses in contracts.

How many companies should I get estimates from?

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 survey for Reiwa 3). 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 according to the site conditions, even in areas with slopes or steps.

I’m in the middle of getting multiple estimates, but can I just have a look at the estimate?

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

Can I request just an emergency repair 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 roof overlay method and removal of asbestos-containing roofing materials. Please check with each town or Kanagawa Prefecture’s office regarding the availability and conditions of assistance programs in case sprayed asbestos is found. We will also provide guidance based on the survey results.

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 due to corrosion of reinforcing bars, 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 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. The five towns in Ashigarakami District are under the jurisdiction of Kanagawa Prefecture, and for collective housing, only “service-equipped housing for the elderly” is designated as a target use, while buildings such as condominiums and rental apartments are not designated as target uses. Mixed-use buildings, including stores, require individual confirmation. Even if not subject to statutory inspections, 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 Ashigarakami District, contact Kakeru Koumuten Co., Ltd.

Our company handles many exterior wall renovations and large-scale repairs for condominiums and apartments in Ashigarakami District. 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 wall painting, all work is performed by our own team. We are confident that we will not be outdone by others in terms of cost, quality, and scheduling, so we welcome multiple estimates!

Large-Scale Repair Work Service Area

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

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