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

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

Large-scale repair work available in Minamiashigara City, Kanagawa Prefecture

Large-scale repairs are not just “exterior wall painting” or “waterproofing”; they are comprehensive repairs to 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 by Building Diagnosis

It is not always necessary to carry out all of the above works. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten Co., Ltd., we conduct a free on-site survey to confirm the following and 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 Minamiashigara City, Kanagawa Prefecture

The reason we can be entrusted with large-scale renovations in Minamiashigara City is partly because “Kakeru Koumuten has a base in Yokohama City,” but also due to our “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 Renovation

At Kakeru Koumuten, we have prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior wall painting and waterproofing work for large-scale 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 in-house.
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 own enough scaffolding materials for approximately 100 single-family homes!

Storage of Materials in Our Large In-house Warehouse

We store paints and substrate repair materials used for exterior renovations. By ordering a large quantity of materials at once, we canpurchase materials at a lower cost! Additionally, we always have stock available, allowing us torespond quickly in emergencies!

In-house Waste Separation

During large-scale renovations, various waste materials such as leftover 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.

Exterior Renovation Dedicated Showroom

In the showroom, not only can you have meetings, but you can alsocheck actual samples and colors of exterior materials. Color simulations for exterior wall painting and thermal insulation tests using a heat insulation 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 in-house construction.

From inquiries 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 repairs, waterproofing work, and tile repairs with complete in-house construction! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Various Permits and Skilled Workers

We have obtained construction industry licenses and permits for industrial waste collection and transportation! We also have nationally 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 and other facilities! We have qualified personnel for asbestos work supervisors and building material asbestos surveyors, so we can manage 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 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 promptly respond to urgent requests!

6. Human Resource Development

Our staff creates various models to enhance their skills and conducts 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 appropriately. 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

Inspections are conducted by responsible personnel for each phase, along with detailed photographs of the work. We use film thickness gauges and check sheets during inspections to ensure there are no oversights. When performing exterior wall painting or waterproofing work, we check the number of used paint cans to confirm that the specified amount of paint has been used, and we order paint in-house to prevent construction defects. Of course, we also ensure that used paint is photographed and reported.

9. Color Simulation for Exterior Wall Painting

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 applying a two-tone color or changing the image, 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 Minamiashigara City, prior consultation and notification are required for new construction or renovations of buildings exceeding a certain scale based on landscape regulations, and there are district planning areas (7 districts). Whether exterior wall repainting is subject to this depends on the scale of the building and the nature of the changes, so we recommend confirming with the Urban Planning Division. Having a color simulation screen will help facilitate explanations at management association meetings and neighborhood associations.

9-2 Confirm actual colors with a test paint!

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

9-3 Exterior renovation simulation

We can also provide exterior simulations for apartments and condominiums!
・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 and roof replacement work

With exterior renovation simulations, you can significantly reduce the risk of failure in changing your image! We hope that renovating the appearance of your apartment or condominium will help increase your occupancy rate.

Cost Estimates for Large-Scale Repairs in Minamiashigara City, Kanagawa Prefecture

The cost of large-scale repairs varies greatly depending on the size of the building, the condition of deterioration, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s cost estimates based on our construction performance, 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 large-scale repairs are concentrated between 750,000 and 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Note that this survey’s figures 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 “Fiscal Year 2021 Survey on Large-Scale Repair Work for Condominiums” (Second aggregation of large-scale repair work. The overall average is construction work 59.0%, temporary works 22.3%, miscellaneous expenses 9.9%). *The total does 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 Repairs, Exterior Wall Painting, Waterproofing, Sealing)

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

Cost Breakdown 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 based on shape, quantity, substrate condition, and type of materials. If you would like a detailed estimate, please feel free to contact us. Estimates are completely free.

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

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

*The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. For surfaces exposed to strong rain and sunlight, choosing high-weather-resistant paint and including rust prevention for metal parts after cleaning will change durability.

Guideline for Repair Reserve Funds and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the guideline for repair reserve funds as a monthly amount per exclusive area. Additional charges are required if there is a mechanical parking lot.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Repair Reserve Funds for Condominiums” (Reiwa 6 June Revision – PDF) / National average is 13,378 JPY per unit per month (Reiwa 5 Fiscal Year Comprehensive Survey on Condominiums)

In the comprehensive survey for the fiscal year Reiwa 5, 36.6% of management associations responded that “the repair reserve fund is insufficient compared to the plan.” There are four main options if there is a shortfall.

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

On the subsidy and grant page of the official Minamiashigara City website, there were no subsidies specifically targeting large-scale renovation work for condominiums found within the confirmed range (Kanagawa Prefecture also does not have subsidies specifically for the work itself). The available options can be broadly categorized into four types. The eligibility and application status of these systems may change 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 contributing to longevity are carried out on condominiums that meet certain requirements, the property tax for the building will be reduced in the year following the construction. The reduction rate is determined by local ordinances within the range set by the national reference standards (one-third, with municipalities able to set between one-sixth and one-half), which varies by city. No mention of this tax system was found on the official website of Minamiashigara City (property tax page), so please confirm with the city’s tax office instead of applying figures from articles or materials from other municipalities directly.

Source: Minamiashigara City “What is Fixed Asset Tax” (Updated March 27, 2023 – no mention of this tax system) / Ministry of Land, Infrastructure, Transport and Tourism “Tax System for Promoting Long Lifespan of Condominiums”

② Support for Condominium Management in Kanagawa Prefecture and Subsidies for Earthquake Resistance and Energy Conservation in Minamiashigara City (Management Associations Should Start Here)

On the official website of Minamiashigara City, there was no confirmation of a dedicated consultation desk or subsidy system for large-scale repairs for management associations, but condominiums in the city are subject to Kanagawa Prefecture’s policies. The dispatch of advisors from Kanagawa Prefecture is available to management associations in the prefecture excluding Yokohama City, Kawasaki City, Sagamihara City, and Yokosuka City, and management associations in Minamiashigara City can also utilize this service.

Source: Kanagawa Prefecture “Condominium Advisor Dispatch Project” / Minamiashigara City “Subsidies for ZEH, Insulation Renovations, EVs, and Solar Power Equipment” (Updated September 18, 2026) / Minamiashigara City “Seismic Reinforcement Project for Wooden Houses” (Updated April 6, 2026)

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

The condominiums in Minamiashigara City are part of a system that requires application and certification from Kanagawa Prefecture. Once certified, you may be eligible for interest rate benefits on the “Condominium Common Area Renovation Loan” from the Housing Finance Agency and Flat 35 (Maintenance Type), which is also one of the requirements for the Long-Life Promotion Tax System (certification alone does not guarantee tax reductions).

*There is no application fee for certification to Kanagawa Prefecture (the prefecture’s page states “It is planned to be free for the time being”). Applications can be submitted in person or by mail to the prefecture’s office, or through the Condominium Management Center’s “Management Plan Certification Procedure Support Service.” This service has a system usage fee of 10,000 yen per application, and there may be additional examination fees for prior confirmation by a condominium management consultant.

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 base your financial plans on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Applications for FY2026 have ended)

* The Existing Housing Energy Saving Renovation Subsidy does not apply to common areas of rental apartments or units where the owner does not reside.

⑥ Loan System (Housing Finance Agency Mansion Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Minamiashigara City

Minamiashigara City is located in the western part of Kanagawa Prefecture, with an area of 77.09 km² (as of 2015). According to the city’s introduction page, forests occupy about 70% of the city area, and the city hall is located in Sekimoto. The history page of the city notes that four villages—Minamiashigara, Okamoto, Fukuzawa, and Kitaashigara—were established with the enforcement of the town and village system in Meiji 22 (1889), and that the Daiyuzan Line was opened in Taisho 14 (1925). The development years of residential complexes and the establishment years of factories could not be confirmed on the city’s official page. The presence of urban areas along the Daiyuzan Line, residential areas defined by district plans, low-lying areas with flood risk, and settlements at the foot of the mountains and in mountain valleys, all with different characteristics, serve as a starting point for considering large-scale repairs in Minamiashigara City. Additionally, Minamiashigara City is an inland city not facing the sea, so salt damage from sea breezes is not a major concern.

Source: Minamiashigara City “Population and Number of Households” (estimated as of September 1, Reiwa 8, updated September 9, 2026, based on preliminary figures from the Reiwa 7 national census) / Minamiashigara City “This is Minamiashigara” (area as of 2015, no timestamp for forest data) / Minamiashigara City “District Plans” *Since the survey timestamps differ for each table, timestamps are provided for each value.

Let’s also confirm the household size. Calculating from the population and number of households on the same page of the city, as of September 1, Reiwa 8, there are approximately 2.3 people per household. The latest figures for the three age groups could not be confirmed on the city’s public page, so they are not covered in this article. The overall figures for the city do not indicate the situation of individual building occupants, and the composition of households varies by location within the same city.

Buildings in Minamiashigara City are divided into “four faces”

Minamiashigara City has different environments in each district, including urban areas along the Daiyuzan Line, residential areas with district plans, lowlands, and areas at the foot of the mountains. The type of heavy construction work required for the next major repair will vary depending on the location of your building. Please note that the history of rebuilding or major renovations differs for each building, so consider the age of the building as a guideline.

Source: Minamiashigara City “History of Minamiashigara City” / Minamiashigara City “What Minamiashigara is Like” / Minamiashigara City “District Plans” (Updated September 9, 2024) / Minamiashigara City “Disaster Prevention Hazard Map” (Updated January 26, 2026) / Minamiashigara City “Flood Risk Areas (Kanagawa Prefecture)” (Updated May 19, 2023) ※The correspondence between district names and locations is organized by our company based on the district names listed in the city’s materials, and the boundaries are not strict.

Four Factors Unique to Minamiashigara City that Damage Buildings

The contents of large-scale repairs vary depending on the location of the building. When investigating buildings in Minamiashigara City, the following four factors should be particularly checked. I will discuss based on the overall trends in the city, but the actual conditions differ for each building, so be sure to confirm on-site.

Source: Minamiashigara City “Disaster Prevention Hazard Map” / Minamiashigara City “Flood Assumed Areas (Kanagawa Prefecture)” / Minamiashigara City “Landscape Plan” (Updated February 16, 2026) / Minamiashigara City “Landscape Regulation Procedures” (Updated June 10, 2021) / Minamiashigara City “District Planning”

Key Points to Consider When Advancing Construction in Minamiashigara City

* Kakeru Koumuten has five locations in Yokohama City, including a showroom and material storage, and we respond to consultations throughout Minamiashigara City, including Sakimoto, Taiyucho, Tsukahara, Wada-Kawahara, Matsushita, Takematsu, Odota, and Iizawa.

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 is based not on the number of years but on the condition of deterioration, so if you observe symptoms like those below, we recommend an early on-site investigation.

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

* The above are reference examples from the guidelines and are not uniform construction deadlines. Actual cycles will be set according to the 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 Actual Conditions of Large-Scale Repair Work for Condominiums in Reiwa 3”

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 waterproofing for the roof for the renovation.

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 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 thermal imaging. For properties in Minamiashigara City, we will also check for rust on iron parts, potential flooding and landslide risks on the site, the condition of slopes and retaining walls, as well as 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 using color simulations, paint samples, and trial applications. For management associations, we can assist in preparing materials for general meetings. In areas subject to landscape regulations and district plans, we will also explain the procedures and color considerations.
5. Notification to Residents & Neighbors We will distribute construction notifications, visit neighbors to introduce ourselves, and set up a bulletin board at the entrance (construction schedule and laundry information). If temporary relocation of parking is necessary, we will coordinate this at this stage.
6. Temporary Scaffold Installation & Various Works Our own scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting and tile repair → waterproofing → iron parts and 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 finished work in the presence of the customer and provide construction photos, a report on the paints used, and a warranty certificate.
8. Aftercare Maintenance We will send annual DM notifications, and inspections can be conducted every year. Simple repairs such as partial sealing are provided free of charge.

Resident 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 (such as the chairman or repair committee) and the estimated amount requiring approval before the contract.

How Will Life Be During Construction? Impact on Residents

It is principle to proceed with large-scale repairs while residents remain in their homes. However, there will be restrictions on daily life while scaffolding is in place. Most troubles can be prevented by providing advance notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction begins.

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

There are many large-scale repair contractors that cover Minamiashigara City, Kanagawa Prefecture, and you may be unsure which contractor 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 peace of mind as it can serve as a reference when actually requesting work.

Using Google and review site ratings 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, the content of the explanations, and the 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 specializes in exterior work, so 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 for warranties. 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 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 the type of work, but typically range from 1 to 10 years. Emergency repairs or partial fixes often do not come with leak warranties. Some contractors also provide aftercare services separate from warranties, so be sure to check if warranties or aftercare services are available.

At Kakeru Koumuten, we send out annual direct mail for aftercare maintenance, allowing for yearly inspections. We also provide simple repairs such as partial sealing at no charge.

Obtain estimates from multiple contractors (at least 3 companies)

When requesting large-scale 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 may 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 cost but also the “items in the estimate,” “methods and materials for substrate repairs and exterior wall painting,” and “confirmation of processes.” Make sure to compare these details carefully! If the quality of the auxiliary materials is low or if processes are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work can be difficult to assess from appearance alone, ensure that the repair methods are appropriate for the condition of the substrate!

Check this on the estimate (checklist)

Check if it is managed in-house

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

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 managing in-house with knowledge and experience, responsible construction can be carried out at a lower 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, 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 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 Works 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 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 by the management association itself

Frequently Asked Questions about Large-Scale Repairs in Minamiashigara City, Kanagawa Prefecture

How much does large-scale repair in Minamiashigara 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 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 estimated at 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment at 4,000,000 to 9,000,000 yen, and for small condominiums or mixed-use buildings at 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 provide free on-site estimates.

How often should large-scale repairs be conducted?

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

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

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

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

For management associations, it typically takes 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 with ample time. If using subsidies or tax incentives, please also factor in the time required to obtain management plan certification (pre-confirmation and application to the prefecture).

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

On the official website of Minamiashigara City, we could not find any subsidies specifically for large-scale repair work on condominiums (there are also no subsidies for the work itself from Kanagawa Prefecture). However, for condominium owners, if certain conditions are met, a reduction in fixed asset tax can be applied under the “Condominium Longevity Promotion Tax System” (the reduction rate varies by city, and we could not find specific details on the official website of Minamiashigara City). Additionally, there is a management plan certification system in Kanagawa Prefecture and a free dispatch of condominium advisors (applications accepted until February 26, 2027). The city’s ZEH and insulation renovation subsidies are stated to be applicable to single-family homes, with no mention of collective housing. If the work includes windows and insulation, it may be eligible for the national “Advanced Window Renovation 2026” and “Future Eco Housing 2026” programs. The application timing and applicants differ by program, so please check the eligibility conditions and application procedures for each program before contracting and starting work.

I heard that fixed asset tax can be reduced through large-scale repairs. Is that true?

It is true if the conditions are met. Under the Condominium Longevity Promotion Tax System, if a condominium that meets the requirements of being over 20 years old and having more than 10 units conducts large-scale repairs (such as exterior painting, floor waterproofing, and roof waterproofing) that contribute to longevity, the fixed asset tax amount for the building will be reduced in the following year. The reduction rate is determined by the city based on the reference standards set by the national government, and we could not confirm the rate and declaration destination on the official website of Minamiashigara City, so please check with the city’s Tax Division, Asset Tax Section (0465-73-8016). The national program applies to work completed between April 1, 2023, and March 31, 2027, and declarations must be made within three months after completion of the work. For management plan certified condominiums, there are also requirements such as raising the repair reserve fund, which takes time to prepare, so we recommend starting the process more than a year before the work.

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

There is. The national “Child-Rearing Green Housing Support Project” has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Management associations and management association corporations can also become joint project participants, allowing for the use of funds for insulation renovations in common areas. Additionally, the “Long-Term Excellent Housing Renovation Promotion Project” will end in the fiscal year 2025, and will not be implemented in fiscal year 2026. The “Advanced Window Renovation 2026 Project” has started accepting bulk applications for apartment buildings from May 29, 2026 (application procedures will be handled by registered businesses). Please be careful not to create 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 construction based on deterioration diagnosis to the next time, ② Review the scope and specifications of the construction, ③ Check for support systems such as subsidies, ④ Consider increasing the repair reserve fund or financing from the Japan Housing Finance Agency. The agency’s financing for common area renovations in condominiums does not require collateral, and interest rates can be reduced by up to 0.6% per year by obtaining management plan certification and implementing energy-saving and seismic construction. 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 issues.

Can scaffolding be set up on a slope or a site with elevation differences?

Yes, it can. Minamiashigara City is an inland city where about 70% of the area is covered by forests, and there are residential areas on slopes and hillsides, including buildings on sloped or terraced sites. Kakeru Koumuten Co., Ltd. owns its own scaffolding materials and has its own scaffolding team, allowing us to plan support and layout for the planks after confirming the site. This is an area 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 the deterioration of retaining walls and slopes and consult on whether they are included in the long-term repair plan.

What will happen to the residents’ parking during construction?

Vehicles on the side where scaffolding will be erected will need to be temporarily moved. In buildings with many units or those with on-site parking, it may take time to secure a relocation spot depending on the number and arrangement of vehicles. Kakeru Koumuten Co., Ltd. will coordinate with you about the availability of nearby coin parking and monthly parking starting 2 to 3 months before construction begins.

Can I freely decide the color of the exterior walls?

This depends on the regulations affecting the building’s site. In Minamiashigara City, based on the landscape ordinance, prior consultation and notification are required for the construction of new buildings or alterations exceeding a certain scale (whether exterior wall repainting is subject to this depends on the building’s size and the nature of the color change). Additionally, there are seven district plans within the city, and the content varies by district. You can check what regulations apply to your site by contacting the Urban Planning Division, Urban Planning Section (0465-73-8026) regarding the landscape ordinance and district plans. Our company will also investigate this during our survey, share the completion image through color simulations, and assist in forming agreements with management associations and neighbors.

Minamiashigara City is far from the sea, but are there any concerns regarding damage to the exterior walls and metal parts?

Minamiashigara City is an inland city not facing the sea, so salt damage from sea breezes is not a major concern. However, the city’s disaster prevention hazard map (January 2026 version) indicates areas at risk of landslides and flooding, and since about 70% of the city is forested, some buildings may be prone to drain blockages from fallen leaves. The assumptions and surrounding environment differ by site, so please check your site on the city’s hazard map. We will check the progression of rust on metal parts, the condition of sealing and waterproof layers, and around drains during the on-site survey, and we will specify the necessary scope in the estimate regarding waterproofing around the first floor and mechanical rooms, as well as the condition of retaining walls and slopes.

Which should I choose, the responsibility construction method or the design supervision method?

The burden of consulting fees increases with fewer units, so for small to medium-sized buildings with fewer units, the responsibility construction method is often more suitable. The design supervision method allows for comparison of construction companies under the same conditions since a third party creates the specifications, but it incurs separate consulting fees and requires caution regarding conflicts of interest and collusion risks. Even with the responsibility construction method, verifying price, specifications, and construction status is essential. Kakeru Koumuten Co., Ltd. provides estimates that clearly state quantities, methods, and materials for each construction item, allowing you to compare us on the same level as other companies.

How can I detect collusion in large-scale repairs?

There are three typical methods. ① Deciding on a contractor in advance and having other companies provide only high estimates as a formality, known as “dummy estimates.” ② Consultants contract at extremely low design management fees and receive kickbacks from partner companies, creating collusion. ③ Adding a portion of the contract amount as a back margin to the construction costs. The countermeasures are to obtain independent estimates, consult with a neutral third party, keep minutes of the selection process, and include penalty clauses in the contract.

How many estimates should I obtain?

We recommend at least three companies. If there are too many, it becomes difficult to compare, and if there are too few, competition does not occur. What is important is not the number of companies but to “create the same playing field before comparing.” By creating a common specification sheet and quantity table and requesting under the same conditions, and by making detailed breakdowns mandatory instead of allowing “one set” notation, it becomes clear whether the price differences are due to variations in scope or unit prices.

What is the difference if you have your own scaffolding?

In large-scale repair construction, temporary construction accounts for about 20% of the costs (according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey). By not outsourcing scaffolding work, it is easier to control costs in this area, and our in-house scaffolding team can flexibly respond to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffolding materials for about 100 single-family homes and plans according to the site, even in sloped or uneven areas.

Can I just have the estimate reviewed while in the middle of obtaining estimates?

Of course, that is possible. If you bring estimates from other companies, we will check whether the items, quantities, 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 measures for a leak?

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

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

Yes, we can. We have qualified personnel who are certified as asbestos work supervisors and building material surveyors 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. If there is sprayed asbestos, we will also provide guidance on the investigation of content, removal procedures, and legal processes.

What happens if large-scale repairs are not done?

There are risks such as personal injury from falling exterior tiles, structural deterioration due to corrosion of rebar, leaks, and a decrease in asset value. Furthermore, buildings subject to periodic reporting under Article 12 of the Building Standards Act require investigations under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovations for tiles or mortar finishes. Minami Ashigara City is under the jurisdiction of Kanagawa Prefecture, and it is necessary to confirm with the prefecture (Kanagawa Prefecture West Civil Engineering Office, Urban Development and Building Guidance Division 0465-83-5111) whether general apartments and condominiums are included in the applicable uses and scales. 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 typically ranges from 2 million to 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 past performance (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 Minami Ashigara City, contact Kakeru Koumuten Co., Ltd.

Our company handles many exterior wall renovations and large-scale repairs for condominiums and apartments in Minami Ashigara City, Kanagawa Prefecture. 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 roof construction 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 competitive estimates!

Areas Covered for Large-Scale Repair Work

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

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