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

Large-Scale Renovations for Condominiums, Apartments, and Buildings in Samukawa Town

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

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but a project that comprehensively addresses the deterioration 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 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 items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Samukawa Town

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

1. Equipment Specialized for Exterior 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 repairs. We have established five bases centered around Yokohama City for material storage and showrooms.

In-house Ownership of Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale repairs and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs on scaffolding work and provide quick and flexible responses.
We own 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 can procure materials at a lower cost! Additionally, we always have stock available, allowing us to provide swift responses in emergencies!

In-house Sorting of Waste Materials

In large-scale repairs, various waste materials such as waste paint, metal, 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 thermal insulation properties using a thermal 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 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担当者 (representative) does not change, 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. Obtaining Various Permits and Skilled Workers

We have obtained construction industry licenses and permits for industrial waste collection and transportation! We also have nationally certified sheet metal and painting skilled workers, and we are confident in our construction techniques. We can also handle large-scale roofing work for factories! We have qualified personnel for asbestos work supervisors and building materials containing asbestos inspectors, so we can handle and conduct preliminary investigations for roofing materials containing asbestos.

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 annually, and we send out notification DM every year.

5. Flexible and Prompt Response

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

We can also address exterior walls and rooftops that cannot be checked from high places using a drone! During leak investigations, we can use a thermal imaging camera to help identify the cause of leaks!

We will respond according to your wishes. We also accept urgent requests for temporary measures against sudden leaks! We will respond quickly to emergencies or urgent requests!

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 improvement education to ensure each staff member can respond appropriately. We also educate on points to be careful about and areas to check in each process of large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale renovation work, we will not only notify residents and greet nearby residents, but also install a bulletin board at the entrance to display the construction schedule and notices! Additionally, we will thoroughly educate visitors on proper manners to minimize any inconvenience to residents and neighbors.

8. Strict Quality Control

Each process will be inspected by a responsible person, and detailed construction photos will be taken. We use film thickness inspection machines and check sheets to ensure that no inspections are missed. During exterior wall painting and waterproofing work, we check the number of used paint cans to confirm that the specified amount of paint is being used, and we order paint directly from our company to prevent construction defects. Of course, we will also take photos of the used paint and report them.

9. Exterior Wall Painting Color Simulation

9-1 Self Color Simulation

Our simulations can be created from 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 increase the occupancy rate! Of course, we can also arrange paint samples for actual color confirmation.

* In Samukawa Town, there are areas designated by district plans, and depending on the area, there may be regulations regarding the color and design of buildings. It is advisable to confirm with the town’s urban planning department in advance when changing the color of the exterior walls. Having a color simulation screen will help facilitate explanations at the neighborhood association or management committee meetings.

9-2 Confirm the Actual Color with a Test Paint!

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

9-3 Exterior Renovation Simulation

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

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

Cost Estimates for Major Repairs in Samukawa Town

The cost of major repairs varies significantly depending on the size of the building, its deterioration status, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s estimates based on past performance by scale, and finally to examples of unit prices for each type of work.

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

According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which collected 818 construction cases (FY 2021), approximately 70% of the costs for major repairs are concentrated in the range of 750,000 to 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Please note that this survey’s amounts 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 may not total 100% due to rounding and non-responses.

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

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in FY2021” (Second survey 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 it includes equipment-related work, exterior works, and others. This is an average value and not a criterion for judging the appropriateness of individual estimates.

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

*The above estimates are based on Kakeru Koumuten’s construction records and may vary depending on the presence of roofing work, metal 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 Works, Substrate Repairs, Exterior Walls, and Waterproofing

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

Examples of Unit Prices for Repair Work

*Costs and warranty years vary depending 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, minimizing waste.

* The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. Choosing paints with anti-moss and anti-mold properties can change durability in shaded and humid areas.

Guidelines for Repair Reserve Funds and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines indicate the estimated repair reserve fund on a monthly basis per unit area. Additional charges are necessary if there is a mechanical parking lot.

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

In the Reiwa 5 Fiscal Year Comprehensive Survey of Condominiums, 36.6% of management associations 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 Samukawa Town

In Samukawa Town, 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 during the fiscal year, so 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 (Property Tax Reduction)

If large-scale repairs (including exterior painting, floor waterproofing, and roof waterproofing) that contribute to the longevity of certain qualifying condominiums are carried out, the property tax amount for the following year will be reduced. The reduction rate is determined by the municipality’s ordinance within the national range (1/6 to 1/2, with the national reference standard being 1/3). I could not confirm the listing of this system on the official website of Samukawa Town under the “Property Tax Reduction System” page (the listed reductions are for seismic, barrier-free, energy-saving renovations, and certified long-term excellent housing, etc.). Please check with the town’s tax collection department during the planning stage of the work to see if you are eligible and what the reduction rate is.

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

The certification of management plans for condominiums is conducted by Kanagawa Prefecture in rural areas. Condominiums within Samukawa Town are also under the jurisdiction of the prefecture. While it is not a subsidy for the actual costs of large-scale repairs, it can be used as a basis for consultation and decision-making in the preliminary stages.

Source: Kanagawa Prefecture “Guide to the Condominium Management Plan Certification System” (PDF)／Samukawa Town “About the Fixed Asset Tax Reduction System”／Samukawa Town “About District Planning”　*The offices and reception status of the system may change.

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

In the towns and villages including Samukawa Town, this is a system certified by the prefecture. Upon receiving certification, you can meet one of the requirements for lower interest rates on the Housing Finance Agency’s “Flat 35” and condominium common area renovation loans, as well as the long-term durability promotion tax system (certification alone does not guarantee tax reductions). The certification criteria consist of 16 items based on national guidelines, not unique to the prefecture. The main criteria include holding a general meeting at least once a year, establishing management regulations, separate accounting for management fees and repair reserve funds, ensuring that the amount of arrears is within 10% of the total, and “having a long-term repair plan that includes large-scale repair work at least twice and is created or reviewed within 7 years, with a planning period of over 30 years.”

*Before applying, it is necessary to obtain a pre-confirmation compliance certificate through the support service for management plan certification procedures provided by the Public Interest Incorporated Foundation Condominium Management Center (pre-confirmation fee is 10,000 yen, tax included). Certification is subject to renewal every five years, and approval from the general meeting is required for the application. Please check the prefecture’s website or guidelines for application procedures.

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 2027 and will not be implemented in fiscal year 2026. Please be careful not to establish a funding plan based on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Subsidies and Support in Samukawa Town, Kanagawa Prefecture (The prefectural subsidies for fiscal year 2026 have ended)

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

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Samukawa Town

Samukawa Town covers an area of 13.42 km² (approximately 5.5 km north-south and 2.9 km east-west) and is spread over generally flat land at an elevation of about 5 to 27 meters. The eastern part is in the southwestern part of the Sagamino Plateau, while the rest consists of alluvial lowlands created by the Sagami River, Mekujiri River, and Koide River (as of March 2022). In terms of land use, 46.1% is designated as urbanization control areas, 17.2% as first-class residential areas, and a combined total of 23.4% is industrial areas including quasi-industrial, industrial, and industrial exclusive zones (as of January 1, 2024). However, this is a statistic for the entire town. Your building’s age and deterioration status will be individually confirmed through on-site surveys.

Source: Samukawa Town Homepage (Population and Number of Households) / Samukawa Town Statistics (PDF) / Samukawa Town National Resilience Regional Plan (March 2022, PDF) / Samukawa Town Urban Master Plan Overview (PDF) *The population and number of households are based on values published on the town’s homepage, while area, land use zones, and number of businesses are based on the town’s statistical book (land use zones as of January 1, 2024, and number of businesses as of June 1, 2021, from the Economic Census – Activity Survey).

Organizing Land Use in Samukawa Town from a Repair Perspective

The table below summarizes only the items that can be confirmed from town and prefectural public documents. Individual building circumstances cannot be determined from the overall town figures.

Four Factors Unique to Samukawa Town to Consider for Large-Scale Repairs

We have organized four factors to keep in mind for large-scale repairs based on the topography and land use of Samukawa Town, as well as the town’s regulations. Since the circumstances differ for each building, we will confirm them individually during the on-site survey.

Source: Samukawa Town National Resilience Regional Plan (March 2022)／Samukawa Town Statistical Report (Land Use and Number of Businesses)／Overview of Samukawa Town Urban Master Plan／Samukawa Town “About District Plans”／Kanagawa Prefecture “Kanagawa Landscape”／Samukawa Town “Flood Hazard Map”

Points of Discussion When Proceeding with Construction in Samukawa Town

* Kakeru Koumuten has established five bases centered around Yokohama City and will visit Samukawa 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 state of deterioration rather than just the number of years, so if you observe any of the symptoms below, we recommend an early on-site inspection.

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

* The above are reference examples from the guidelines and are not uniform construction deadlines. The actual cycle will be set according to the specifications, location conditions, and state of deterioration of the building.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Creating Long-Term Repair Plans” (Reiwa 6 June Revision – PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in Fiscal Year 2021”

Examples of Large-Scale Renovation Work

This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten Co., Ltd. The building had leaks occurring in several places, and we combined clear waterproofing for the tile exterior wall with waterproofing for the roof for the renovation.

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

Customer Feedback

Flow from On-Site Survey to Completion of Construction

From the initial inquiry to the completion of the work and aftercare, a single representative will consistently handle your case. For management associations, a resolution at the general meeting is required, so starting the process 1 to 1.5 years before the desired start date allows for a smoother progression.

1. Inquiry (Free) Please contact us via phone, form, or LINE. If you have estimates from other companies, just presenting them is fine.
2. On-site Investigation & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and the waterproof layer, and if necessary, investigate the rooftop, high places, and leak areas using drones or thermal imaging. For properties in Samukawa Town, we will also check the road width, distance to neighboring properties, delivery routes, parking, and the drainage conditions of the rooftop and balcony.
3. Submission of Investigation Report & Estimate We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. Multiple plans can also be proposed.
4. Plan Decision & Contract Confirm colors using color simulations, paint samples, and trial painting. For management associations, we will assist in preparing materials for the general meeting. In areas subject to district planning, we will also explain the considerations for color selection.
5. Notification to Residents & Neighbors We will distribute construction notifications, visit neighbors to greet them, and set up a bulletin board at the entrance (with a schedule and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
6. Installation of Temporary Scaffolding & Various Works Our in-house scaffolding 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 responsible person will inspect each process and take construction photos.
7. Completion Inspection, Scaffolding Dismantling & Handover We will confirm the finish in the presence of the customer and provide construction photos, a report on the paint used, and a warranty certificate.
8. Aftercare 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, Approval for Additional Work, 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 approximate amount that will require approval before the contract.

What Will Life Be Like During Construction? Impact on Residents

For large-scale repairs, the principle is to proceed while residents remain in their homes. However, there will be limitations on daily life while scaffolding is in place. Most troubles can be avoided by providing prior 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 Samukawa Town, and you may be unsure which one to choose. When requesting renovations for apartments, condominiums, or buildings, please check the following four points.

Extensive Experience in Large-Scale Repairs

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

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 troubles with residents and nearby neighbors. Therefore, it is necessary to report the progress of the work and information about laundry, etc., on bulletin boards to prevent issues before they arise. Kakeru Koumuten Co., Ltd. specializes in exterior work, and we receive many requests for exterior renovations of apartments and condominiums.

Check for Warranty and Aftercare Services

When choosing a large-scale repair company, let’s confirm the presence of a warranty. 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 the presence of warranties and aftercare services.

At Kakeru Koumuten Co., Ltd., we send out annual direct mail for aftercare maintenance, allowing for inspections every year. 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, obtain estimates from multiple contractors. It is important to get estimates from at least 3 companies and compare their quotes and reports! Even for the same work, costs can vary between contractors, and warranties and aftercare services may differ as well. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, be sure to look at not just the costs, but also “the items in the estimate,” “the methods and materials for substrate repair and exterior wall painting,” and “confirmation of the process” to make a detailed judgment! If the quality of auxiliary materials is low or if 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 visually, 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 depending on the actual deterioration condition and customer preferences.

Contractors that completely outsource to subcontractors may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or meaningless work. If you investigate and then request a subcontractor, it may incur additional time and costs. By having knowledge and experience and managing in-house, responsible construction can be performed at a reduced cost.

Additionally, contractors that outsource may be slow to respond if any troubles occur 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, with knowledgeable and experienced personnel managing the construction!

There are three ordering methods. The choice affects the approach.

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

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

Latest 2026 In the large-scale renovation industry, inappropriate orders linked between design consultants and construction companies have long been a problem. The Ministry of Land, Infrastructure, Transport and Tourism issued warnings and notifications to management associations in January 2017 and April 2023, and on September 28, 2026, the Japan Fair Trade Commission announced that it had issued exclusion orders to 38 companies and imposed a total of 1.63788 billion yen in surcharge payment orders to 37 companies regarding large-scale renovation work commissioned by condominium management associations to design consulting firms in the Kanto region (two design consulting firms were also subject to exclusion orders).

※Based on the announcement by the Japan Fair Trade Commission (September 28, 2026).

Three Typical Methods

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 contractor selection process in meeting minutes to ensure transparency
• Confirm the reasons for any unusually low design supervision fees from consultants
• Include a penalty clause in the contract for cases of collusion discovery
• Avoid concentrating information with a single consultant and verify specifications by the management association itself

Contact Points for Third-Party Consultation

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

Source: Kanagawa Prefecture “Guide to the Condominium Management Plan Certification System” (PDF)／Samukawa Town “About the Property Tax Reduction System”／Condominium Management Plan Certification System Consultation Dial／Kanagawa Prefecture “Condominium Advisor Dispatch Project”

Frequently Asked Questions about Large-Scale Repairs in Samukawa Town

How much does large-scale repair in Samukawa Town cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, about 70% of cases fall between 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 or mixed-use buildings. The costs vary depending on the condition of the substrate and whether waterproofing or roofing work is needed, 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 determining factor should be the condition of the building rather than just the number of years. If there are signs of deterioration such as sealing degradation, tile lifting, or breaks in the waterproof layer, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. We will assess the age and condition of your building during the on-site survey to make a judgment.

What is the construction period? Can residents stay during the work?

For apartments, the estimated period is about 3 weeks to 2 months, for small condominiums or buildings about 1.5 to 3 months, and for condominiums with more than 50 units about 4 to 6 months. Residents can remain in their homes during the construction. However, there will be restrictions on drying laundry outside and opening windows while scaffolding is in place, so we take thorough measures to minimize the impact on daily life, such as distributing advance notices, providing information on the progress and laundry schedules on 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 about 1 to 1.5 years for establishing a repair committee, conducting building diagnostics, selecting contractors, and passing resolutions at general meetings, followed by 3 to 6 months for construction. Overall, it is advisable to plan for 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 preliminary checks by the condominium management center to certification by Kanagawa Prefecture).

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

As of now, there do not appear to be any subsidies specifically for large-scale repair work on condominiums in Samukawa Town or Kanagawa Prefecture. The town does have programs such as the “Housing Renovation and Construction Promotion Subsidy Project” (which requires work to be done by local contractors) and “Zero Carbon Promotion Measures Equipment Subsidy” (for individual solar panels, storage batteries, etc.), but the eligibility and conditions are limited. For condominiums, there may be a reduction in fixed property tax under the Long-Life Condominium Promotion Tax System (a national program; please confirm with the town’s property tax department for local handling), and Kanagawa Prefecture offers free dispatch of condominium advisors. If the work includes windows and insulation, it may be eligible for “Advanced Window Renovation 2026” or “Future Eco Housing 2026.” The application timing and applicants vary by program, so please check the eligibility conditions and application procedures for each program before signing a contract or starting construction.

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

It is true if the requirements are met. Under the Long-Life Condominium Promotion Tax System, condominiums that meet criteria such as being over 20 years old and having more than 10 units can have their fixed property tax reduced for large-scale repairs (including exterior painting, floor waterproofing, and roof waterproofing) that contribute to longevity. The reduction applies to the following year’s property tax amount (up to the equivalent of 100 square meters per unit). The reduction rate is determined by local ordinances within the national range (1/6 to 1/2), but we could not confirm the details and rates on the official page of Samukawa Town. Please check with the town’s Tax Collection Division, Property Tax Section (phone 0467-37-3449) to see if you qualify and what the reduction rate is. Under the national program, the work must be completed by March 31, 2027, and an application must be submitted within 3 months of completion. Other reduction measures cannot be combined, and it is limited to one time per unit. For certified management plan condominiums, there are additional requirements such as raising the repair reserve fund, which may take time to prepare, so we recommend starting 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 repairs based on a deterioration diagnosis for the next time, ② Review the scope and specifications of the work, ③ Check for subsidies and support systems, ④ Consider increasing the repair reserve fund or financing from the Japan Housing Finance Agency. The agency’s condominium common area renovation loans 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 for decisions on separation.

Can scaffolding be set up on narrow sites or buildings close to neighboring properties?
Yes, it can. Samukawa Town is generally a flat area, but there are sites with limited road widths and buildings close to neighboring properties. Kakeru Koumuten Co., Ltd. owns its own scaffolding materials and has its own scaffolding team, allowing us to plan the delivery route and scaffolding layout after checking the site. This is a part where additional costs are likely to arise after seeing the site, so it is important to confirm the delivery route during the estimation stage.

What happens to the residents’ parking 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 location. Kakeru Koumuten Co., Ltd. will coordinate with you about the availability of nearby parking starting 2 to 3 months before construction begins.

Can I freely decide the color of the exterior walls?
There are two district plans in Samukawa Town (Samukawa Station North Exit District and Tabata West District), and if you are planning to construct or expand a building within these areas, you must submit a notification at least 30 days before starting. Restrictions on color and design can be confirmed in each district’s plan. Based on the landscape law, there does not appear to be a town landscape plan within the confirmed range, and notifications based on Kanagawa Prefecture’s landscape regulations are not required throughout the prefecture. To check whether your property falls within the district plan area, please contact the Urban Planning Division of the town’s Urban Planning and Development Guidance (Phone: 0467-37-5409). 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 or neighboring buildings overlap, moisture can become trapped, making it easier for algae, moss, and mold to thrive. This is more likely to occur in locations close to trees. By thoroughly removing it with high-pressure washing and choosing paint with anti-algae and anti-mold properties, you can suppress recurrence. 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, the responsibility construction method or the design supervision method?
In smaller buildings, the burden of consulting fees tends to be heavier, so we believe that the responsibility construction method is often more suitable for small to medium-sized buildings. The design supervision method allows for comparison of construction companies under the same conditions since a third party creates the specifications; however, 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 outline quantities, methods, and materials for each construction item, allowing you to compare them on the same level as other companies.

How can I detect collusion in large-scale repairs?
There are three typical tactics. ① Pre-selecting a contractor and having other companies submit only formal high estimates, known as “dummy estimates,” ② A consultant contracts at an extremely low design supervision fee and receives kickbacks from partner companies, 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, documenting the selection process in meeting minutes, and including penalty clauses in contracts.

How many companies should I get estimates from?We recommend at least three companies. If there are too many, it becomes difficult to compare, and if there are too few, competition does not occur. What is important is not the number of companies but “comparing after creating the same playing field.” By creating a common specification sheet and quantity table and requesting estimates under the same conditions, while making detailed breakdowns mandatory instead of accepting “one set” notation, it becomes clear whether the price differences are due to differences in range or unit prices.

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 fiscal year 2021 survey). By not outsourcing scaffolding work, we can easily control costs in this area, and our in-house scaffolding team can flexibly respond to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffolding materials for about 100 single-family homes and plans according to the site, even in areas with limited road width.

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

Of course, that’s possible. If you bring estimates from other companies, we will check for free whether the items, quantities, methods, and materials are appropriate and provide you with an estimate under the same conditions. We welcome multiple 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 asbestos work supervisors and building material surveyors for asbestos-containing materials. We handle everything from the legally required preliminary surveys to the cover method and removal of asbestos-containing roofing materials. Please check with the Samukawa Town or Kanagawa Prefecture offices regarding the availability and conditions of assistance systems 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 accidents due to falling exterior wall tiles, structural deterioration due to corrosion of rebar, leaks, and a decrease in asset value. Furthermore, for buildings subject to regular reporting under Article 12 of the Building Standards Act, investigations through comprehensive 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. Samukawa Town is included in the area managed by Kanagawa Prefecture, and the applicable uses and scales are designated by the prefecture. The conditions for targets such as the number of floors and floor area vary by building, so please check with the Prefectural Building Safety Division, Building Safety Group (phone 045-210-6257). Even if not subject to statutory investigations, regular inspections and maintenance are essential, so please consult us if you are unsure about your judgment.

How much does large-scale repair for an apartment (about 10 units) cost?

For a two-story wooden building with 6 to 10 units, the estimate is around 2 million to 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it is around 4 million to 9 million yen, based on our company’s track record (including scaffolding, substrate repairs, exterior wall painting, sealing, and waterproofing). It is common to carry out repairs for apartments every 10 to 15 years. For owners, there is an increasing trend to change the appearance with color simulations during repairs to improve occupancy rates.

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

Our company handles many exterior wall renovations and large-scale repairs for condominiums and apartments in Samukawa Town. 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 lose in terms of cost, quality, and planning compared to other companies, so we welcome multiple estimates!

Large-Scale Repair Work Service Area

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

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