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

Large-Scale Renovations for Condominiums, Apartments, and Buildings in Chigasaki City

Large-scale repair work that can be handled in Chigasaki City

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but rather a comprehensive repair of the entire building’s deterioration while scaffolding is in place. At Kakeru Koumuten, we can handle all of the following work in-house, ensuring clear responsibility and coordination of the process.

Scope of Major Repairs Determined from Building Diagnosis

It is not guaranteed that all of the above works will be carried out. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten, we conduct a free on-site survey to confirm the items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Why Kakeru Koumuten is Chosen for Large-Scale Renovations in Chigasaki City

The reason why we can be entrusted with large-scale renovations in Chigasaki 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 Renovations

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

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale renovations and can assemble the scaffolding ourselves.
By not outsourcing scaffolding work and using our own scaffolding team, we can cut costs on scaffolding work and provide quick and flexible responses.
We have approximately enough scaffolding materials for 100 single-family homes!

Storage of Materials in Our Large In-house Warehouse

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

In-house Waste Sorting

Large-scale renovations generate various types of waste, including leftover paint, metal, and wood. At Kakeru Koumuten, we sort and recycle waste in-house, which helps reduce waste disposal costs.

Showroom Dedicated to Exterior Renovations

In the showroom, not only can you have meetings, but you can also check actual samples and colors of exterior materials. Color simulations for exterior wall painting and heat resistance tests using a heat resistance testing machine are also available!

2. Cost Reduction through In-House Management and Construction

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

By managing everything from inquiries to project completion in a consistent system by Kakeru Koumuten, we can keep costs down while ensuring high-quality large-scale repairs. Additionally, one representative will handle everything from the estimate to project completion. Since the person in charge does not change, whether it’s sales or 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 conduct inspections and actual construction for each process!

3. Obtaining Various Permits and Skilled Workers

We have obtained permits for the construction industry and for the collection and transportation of industrial waste! We also have nationally certified sheet metal and painting specialists on staff, and we are confident in our construction techniques. We can also handle large-scale roofing work for factories! We have qualified personnel for asbestos work supervisors and building material asbestos surveyors, so we can 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 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 utilize a thermal imaging camera to help identify the cause of leaks!

We will respond according to your wishes. We also accept emergency measures for sudden leaks! We will promptly respond to urgent requests!

6. Staff Development

Our staff create various models for skill enhancement and conduct practical training. Since different processing and techniques are required at the site, 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 during large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we not only notify residents and visit neighbors to greet and explain, but we also set up notice boards at entrances to display progress charts and announcements! Additionally, we thoroughly educate entrants on manners to minimize inconvenience to residents and neighbors.

8. Strict Quality Control

Each process is inspected by a responsible person, and detailed construction photos are taken. We use film thickness testers and check sheets to ensure there are no oversights in inspections. During exterior painting and waterproofing work, we confirm the quantity of used paint cans to ensure the specified amount of paint is used, and we prevent construction defects by ordering paint in-house. Of course, we will also take photos of used paint and report them.

9. Exterior Painting Color Simulation

9-1 Self-Color Simulation

The simulations created by our company can be done using photos of your actual apartment or building!You can also perform simulations on your smartphone or computer. By simulating and then changing to a two-tone color or altering the image, we hope to help enhance the stylish appearance and increase occupancy rates! Of course, we can also arrange for paint samples to confirm the actual colors.

*In Chigasaki City, notification is required for changes in color for buildings above a certain size and for repainting exteriors in special scenic areas. Since the regulations differ by area, prior confirmation of the exterior color is necessary. Having a color simulation screen will help facilitate explanations at community meetings and general 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 doing a test paint, you can confirm the actual color and gloss!

9-3 Exterior renovation simulation

We can also perform the following exterior simulations for apartments and condominiums!
・Exterior wall color simulation (two-tone colors are also possible)
・Simulation for applying metal siding
・Simulation using accent materials such as cornices and louvers
・Simulation for roof painting or roof replacement work

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

Cost Estimates for Large-Scale Repairs in Chigasaki City

The cost of large-scale repairs varies significantly depending on the size of the building, its condition, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s estimates based on past 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 compiled 818 construction cases (FY 2021), approximately 70% of the costs for large-scale repairs are concentrated in the range of 750,000 to 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Note that the amounts in this survey do not include consumption tax and common temporary costs, so they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Large-Scale Repair Work for Condominiums” (200 companies, 818 cases) *The amounts do not include consumption tax or common temporary costs. The percentages may not total 100% due to rounding and non-responses.

Breakdown of Construction Costs (Where the Money Goes)

Source: Ministry of Land, Infrastructure, Transport and Tourism “Fiscal Year 2021 Survey on Large-Scale Renovation Work for Condominiums” (Second survey of large-scale renovation work. The overall average is 59.0% for construction-related, 22.3% for temporary structures, and 9.9% for miscellaneous expenses). *The total does not equal 100% because it includes equipment-related work, exterior works, and others. This is an average value and is not a criterion for judging the appropriateness of individual estimates.

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

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

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

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

Unit Price Examples for Repair Works

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

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

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

* The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. The rate of deterioration differs for each side based on location, sunlight, and ventilation, so confirming the condition of each side through a site survey and selecting paint suitable for the location can change durability.

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 exclusive 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 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 Chigasaki City

In both Chigasaki City and Kanagawa Prefecture, there were no publicly available subsidies specifically targeting large-scale renovation work (the city has subsidies for seismic diagnosis of old earthquake-resistant condominiums). 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 (Reduction of Fixed Property Tax)

If large-scale repairs (all three types: exterior wall painting, floor waterproofing, and roof waterproofing) that contribute to the longevity of condominiums meeting certain requirements are carried out, the fixed property tax amount for the residential portion will be reduced (up to 100㎡ equivalent per unit). In Chigasaki City, the fixed property tax for the following year will be reduced by one-third for eligible properties.

* The contact for applications is Chigasaki City, Citizens’ Department, Asset Tax Division, Building Valuation Section (phone 0467-81-7142). For management plan certification and advice/guidance, please confirm with the Urban Policy Division, Housing Policy Section (phone 0467-81-7181) before construction.

② Condominium Management Support in Chigasaki City (For management associations, start here)

The contact for condominium-related matters in Chigasaki City is the Urban Policy Division, Housing Policy Section (phone 0467-81-7181). On the city’s housing-related page, no subsidies for the construction costs of large-scale repairs were confirmed. The focus is on consultation, planning, and support for seismic assessments.

Source: Chigasaki City “Housing (Housing Policy)” / Same “Information on Subsidy for Seismic Diagnosis of Condominiums”

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

This is a system certified by Chigasaki City based on national regulations. Upon certification, there are interest rate benefits for the Housing Finance Agency’s “Condominium Common Area Renovation Loans” and Flat 35 (Maintenance and Preservation Type), and it relates to one of the requirements for the Long Lifespan Promotion Tax System (certification alone does not guarantee tax reduction). The certification requirements are based on the national “Standards for Condominium Management,” which includes 16 items. The main criteria include holding general meetings at least once a year, maintaining management regulations, separate accounting for management fees and repair reserves, ensuring that overdue amounts for more than three months do not exceed 10% of the total, and “having created or reviewed a long-term repair plan that includes two or more large-scale repair works over a period of 30 years within the last seven years.” Pre-confirmation and application are conducted through the Public Interest Incorporated Foundation Condominium Management Center’s “Management Plan Certification Procedure Support Service,” and the city will review and issue a certification notification. The city’s page only provides information on the national certification standards.

*Fees and the validity period of the certification are not listed on the city’s page. Please confirm with the Condominium Management Center or the Urban Policy Division, Housing Policy Section.

④ National Energy Saving Support | Housing Energy Saving 2026 Campaign

Changes for Fiscal Year 2026The “Childcare 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 FY 2026 have closed)

* The subsidy for existing housing energy efficiency renovation costs does not apply to 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 Cannot

Building Conditions and Repair Points in Chigasaki City

Chigasaki City is a city that faces Sagami Bay to the south and is adjacent to the Sagami River to the west. It has an area of 35.70 km², with different environments within the same city, from the urban area around Chigasaki Station to coastal residential areas, the Hamamidaira area undergoing redevelopment, and low-lying residential areas along rivers. There are rules related to appearance and construction, such as notifications based on the Landscape Act and special landscape town planning areas around Chigasaki Beach and the fishing port, and district plans, which vary depending on the location, affecting how buildings deteriorate, how scaffolding is set up, and the necessary procedures before construction.

Source: Chigasaki City “Latest Population and Households” (estimates based on the preliminary results of the 2025 national census. The city plans to recalculate after the confirmed values are announced around November 2026) / Same “District Plans”

Buildings in Chigasaki City are divided into “four types”

In Chigasaki City, the rules regarding the formation and appearance of the town differ by location, so not only the age of the building but also the location of the building (Hamamihira area, around Chigasaki Coast and fishing port, buildings subject to landscape law notification, districts with district plans and other residential areas) will affect the construction and procedures that become more burdensome during the next major repair. Please check which type your building falls under.

Source: Chigasaki City “About Town Development in Hamamidaira Area” / Same “Chigasaki Coast and Fishing Port Special Scenic Town Development Area” / Same “Notifications Based on the Landscape Act (Outside Designated Areas)” / Same “District Plan”

Four Factors Unique to Chigasaki City That Damage Buildings

From the characteristics visible in Chigasaki City’s public documents, we have narrowed it down to four factors that lead to major repairs.

Source: Chigasaki City “Chigasaki City Tsunami Hazard Map”／Same “Chigasaki City Liquefaction Hazard Map”／Same “Chigasaki City Flood, Landslide, and Internal Water Hazard Map”／Same “Notification Based on the Landscape Act (Outside Designated Areas)”

Key Points to Consider When Proceeding with Construction in Chigasaki City

* Kakeru Koumuten has five bases in Yokohama City and serves the entire Chigasaki area, including Hamamihira, Minami Lake, Kagawa, Enzo, and Matsubayashi.

Signs of Deterioration Requiring Major Repairs and Timing

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

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

*The above is a reference example of guidelines and is not a uniform construction deadline. The actual cycle will be set according to the specifications, location conditions, and deterioration status of the building.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Long-Term Repair Planning” (Revised June 2024, PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Survey on Actual Conditions of Large-Scale Repair Work for Condominiums in FY2021”

Examples of Large-Scale Renovation Work

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

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

Customer Feedback

Process from On-Site Survey to Completion of Work

From inquiry to completion of work and aftercare, a single 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 allows for a smoother progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, just presenting those is fine.
2. On-site Investigation & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproofing layers, and if necessary, use drones or thermal imaging to investigate the roof, high places, and leak areas. For properties in Chigasaki City, we will check whether they are located near the station or along main roads, the distance to neighboring properties, the width of the road and delivery routes, pedestrian traffic, drainage, rust on metal parts and fittings, and parking lots.
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. We can also propose multiple plans.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial applications. For management associations, we can assist in preparing materials for general meetings. In areas subject to district planning, landscape planning, or building agreements, we will also explain the considerations for color choices.
5. Notification to Residents & Neighbors We will distribute construction notifications, visit neighbors to greet them, and set up a bulletin board at the entrance (with a schedule and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
6. Temporary Scaffolding Installation & Various Works Our own scaffolding team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → metal parts & auxiliary work in that order. A responsible person will inspect and take construction photos at each stage.
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 paints used, and a warranty certificate.
8. Aftercare Maintenance We will send out 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 provide materials and reports in the following four situations.

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

What Will Life Be Like During Construction? Impact on Residents

Large-scale repairs are principally carried out while residents remain in their homes. However, there will be restrictions on daily life while scaffolding is in place. Most troubles can be prevented by providing advance notice, so Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction begins.

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

There are many large-scale repair contractors that serve Chigasaki City, 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 work. If they provide detailed explanations of repair content with photos, it can offer reassurance as a reference when you actually make a request.

Using ratings from Google and review sites can be effective when comparing large-scale repair contractors! Be cautious if there are many negative reviews. If there are few reviews, also check the construction track record, the content of explanations, and the management system.

Large-scale repair work involves not only the construction itself but also potential 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 troubles before they occur. Kakeru Koumuten Co., Ltd. specializes in exterior work, and we receive many requests for exterior renovations of apartments and condominiums.

Check for 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 construction, having a leak warranty from the contractor means you can have it repaired at no cost, which is reassuring! A company that offers a warranty is a sign of confidence in their work, making it a criterion for selecting a contractor.

Warranty periods vary by contractor and the nature of the work, but typically range from 1 to 10 years. Emergency repairs or partial fixes often do not come with a leak warranty. Some contractors also offer aftercare services separate from warranties, so be sure to check for warranties and aftercare services.

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

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 work, costs can vary between contractors, and warranties and aftercare services may differ. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repair and exterior wall painting,” and “confirmation of the process.” Avoid judging solely based on cost, as lower costs can result from using lower-quality materials or skipping processes. Especially since substrate repair work is not easily visible from the outside, ensure that the repair method is appropriate for the condition of the substrate!

Check these points on the estimate (checklist)

Confirm whether it is managed in-house

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

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

Additionally, contractors that outsource to subcontractors may have delayed responses in case of any troubles during construction. It is safer to avoid having a company that has not actually discussed with the customer manage the construction. Kakeru Koumuten performs everything from temporary scaffolding installation to exterior wall painting and waterproofing work in-house, managed by knowledgeable and experienced personnel!

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

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

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 concern. 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.

*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 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 professionals or architects
• Document the contractor selection process in minutes to ensure transparency
• Confirm the reasons for abnormally low consulting fees
• Include a penalty clause in the contract for cases of collusion
• Avoid concentrating information with a single consultant and verify specifications independently

Frequently Asked Questions about Large-Scale Repairs in Chigasaki City

How much does large-scale repair in Chigasaki City 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 construction costs), with the most common range being 1,000,000 to 1,250,000 yen. Based on our construction records, the cost for a two-story wooden apartment ranges from 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment from 4,000,000 to 9,000,000 yen, and for small condominiums or mixed-use buildings from 5,000,000 to 15,000,000 yen. The cost varies depending on the condition of the substrate and whether waterproofing or roofing work is needed, so we will provide an estimate through a free on-site survey.

How often should large-scale repairs be conducted?

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

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

The estimated duration is about 3 weeks to 2 months for apartments, 1.5 to 3 months for small condominiums or buildings, and about 4 to 6 months for condominiums with over 50 units. 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, including distributing advance notices, providing information on the schedule and laundry through bulletin boards, and strictly adhering to working hours.

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

For management associations, it typically takes about 1 to 1.5 years for establishing a repair committee, conducting building diagnostics, selecting contractors, and obtaining resolutions at general meetings, followed by 3 to 6 months for the construction itself. Overall, it is advisable to plan for about 2 years to proceed comfortably. If you are using subsidies or tax incentives, please also factor in the time required to obtain management plan certification (which requires prior confirmation and a resolution at a general meeting).

Are there any subsidies available for large-scale repairs in Chigasaki City?

There were no confirmed subsidies specifically for large-scale repair work from publicly available information for either Chigasaki City or Kanagawa Prefecture. However, if it is a condominium, you may be eligible for a reduction in fixed property tax under the “Condominium Longevity Promotion Tax System” if certain conditions are met (Chigasaki City offers a one-third reduction for the following year’s tax). The city also provides subsidies for seismic diagnostics of old earthquake-resistant condominiums and has a management plan certification system. If the work includes windows and insulation, it may qualify for “Advanced Window Renovation 2026” or “Mirai Eco Housing 2026.” The application timing and applicants differ by program, so please check the eligibility conditions and application procedures for each program before contracting or starting construction.

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

Yes, it is true if the conditions are met. Under the Condominium Longevity Promotion Tax System, if a condominium that is over 20 years old and has more than 10 units conducts large-scale repairs that contribute to longevity, the fixed property tax for each residential unit can be reduced by one-third for the following year’s tax, up to the equivalent of 100 square meters (urban planning tax is not included). This applies to work completed between April 1, 2023, and March 31, 2027, and a declaration must be made within three months of completion. The declaration should be submitted to the Chigasaki City Asset Tax Division, Building Evaluation Section (phone 0467-81-7142). It is a requirement to be a certified management plan condominium or a management association that has received advice and guidance, and preparations such as raising repair reserve funds may take time, so it is recommended to start the process more than a year before the construction.

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

Yes, there are. 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 insulation renovations in common areas. Additionally, the “Long-Term Excellent Housing Renovation Promotion Project” will end in fiscal year 2025, and it will not be implemented in fiscal year 2026. The “Advanced Window Renovation 2026 Project” has started accepting bulk applications for apartment buildings from May 29, 2026 (the application process is handled by registered contractors). Please be careful not to base your financial planning on outdated information.

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

選択肢は主に4つです。①劣化診断のうえで緊急性の低い工事を次回に送る、②工事範囲や仕様を見直す、③補助金などの支援制度を確認する、④修繕積立金の増額や住宅金融支援機構の融資を検討する、です。同機構のマンション共用部分リフォーム融資は担保不要で、管理計画認定の取得や省エネ・耐震工事の実施により金利が最大年0.6%引き下げられます。なお、防水とタイル剥落対策の先送りは結果的に高くつくことが多いため、切り分けの判断はご相談ください。

Can you handle large-scale repairs for complexes and large condominiums with many buildings and units?

Yes, we can discuss this. In Chigasaki City, there are areas like the Hamamihiradai district where redevelopment of complexes is progressing. We also accept inquiries for properties with many buildings and units. For properties with many buildings, it is important to conduct deterioration diagnosis for each building, plan the process of whether to do it all together or divide it by building or year, and form consensus at the general meeting. Kakeru Koumuten Co., Ltd. targets condominiums with over 100 units as a cost estimate and will provide proposals that allow for comparison of multiple process plans.

What happens to the parking for residents during construction?

Vehicles on the side where scaffolding will be set up will need to be temporarily moved. In buildings with limited parking availability, it may take time to secure a relocation spot. 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?

Generally, the color of the building is decided by the management association or the owner; however, there are procedures and standards for buildings that fall under the Landscape Act, special landscape town planning areas, and district plans. Notifications under the Landscape Act are required for buildings over 10 meters in height, with a total floor area of 1,000㎡ or more, or with 8 or more planned units when making repairs that change the appearance or color. Notifications must be submitted at least 30 days before construction begins. The city also requests notifications for repainting exterior walls in the same color. In the special landscape town planning areas around Chigasaki Beach and the fishing port, repainting of exterior walls for all buildings in the area is subject to notification. For inquiries regarding landscape, please contact the Landscape Greenery Division (phone 0467-81-7182), and for district plans, please consult the Building Guidance Division. We will also investigate what applies to your property during our survey. Sharing a color simulation of the completed image can facilitate discussions with neighbors and the management association.

Are there differences in construction depending on the location, such as near the station, residential areas, along the coast, or in complexes?

Chigasaki City has areas with different environments, including the urban area around Chigasaki Station, the coastal area facing Sagami Bay, the Hamamihiradai district where redevelopment of complexes is progressing, and low-lying areas along rivers such as the Sagami River. Depending on the location, there may be differences in road width, distance from neighboring properties, pedestrian traffic flow, and types of buildings (mixed-use buildings, wooden apartments, condominiums, complexes, etc.), which may require ingenuity in setting up scaffolding and transporting materials. Kakeru Koumuten Co., Ltd. has its own scaffolding team that will check the site and plan the transportation route and scaffolding layout. Additionally, the city publishes hazard maps for tsunamis, liquefaction, flooding, and internal water, and buildings close to the sea focus on inspecting rust on metal parts, sealing, waterproofing layers, and drainage on rooftops and sites in low-lying areas. The degree of deterioration varies by building, so we conduct individual diagnoses during on-site surveys.

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

For buildings with fewer units, 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, verification of 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 them on the same level as other companies.

How can I detect collusion in large-scale repairs?

There are three typical methods. ① Deciding on the contractor in advance 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 affiliated contractors, leading to collusion. ③ Adding a portion of the contract amount as a back margin to the construction costs. Countermeasures include obtaining independent estimates, consulting with a neutral third party, keeping minutes of the selection process, and including penalty clauses in the contract.

How many companies should I get estimates from?

最低3社をおすすめします。多すぎると比較しきれず、少なすぎると競争が働きません。大切なのは社数よりも「同じ土俵を作ってから比べること」です。共通の仕様書や数量表を作って同一条件で依頼し、「一式」表記を認めず内訳明細を必須にすると、金額差が範囲の違いなのか単価の違いなのかがはっきりします。

What is the difference if we have our own scaffolding?

In large-scale repair projects, temporary construction accounts for about 20% of the total cost (according to the Ministry of Land, Infrastructure, Transport and Tourism’s FY2021 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 approximately 100 single-family homes and plans scaffolding on-site according to the site conditions.

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

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

Can I request just emergency repairs for a leak?

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

Can you handle roofing or exterior materials that contain asbestos?

Yes, we can. We have qualified personnel, including asbestos work supervisors and building material surveyors, who can conduct the legally required preliminary surveys and handle the cover method or removal of asbestos-containing roofing materials. The availability of subsidies for investigation and removal costs when there is sprayed asbestos may vary by year, so please check in advance with the municipal office. We will also provide guidance from the investigation stage.

What happens if large-scale repairs are not done?

There are risks such as personal injury accidents due to falling exterior tiles, structural deterioration from rusting rebar, leaks, and a decrease in asset value. Furthermore, buildings subject to periodic reporting under Article 12 of the Building Standards Act require investigations through full probing, etc., under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovations for tile or mortar-finished walls. The submission destination for periodic reports in Chigasaki City is the city’s Building Guidance Division, and on the city’s page, it states that for collective housing, it is limited to “service-equipped housing for the elderly.” Mixed-use buildings, including stores, require individual confirmation (Chigasaki City Building Guidance Division, Building Safety Section, Phone: 0467-81-7185). Even if not subject to statutory investigations, regular inspections and maintenance are essential, so please consult us if you are unsure about your judgment.

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

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

If you are looking for large-scale repair contractors in Chigasaki City, contact Kakeru Koumuten

Our company is based in Yokohama City and has handled many exterior wall renovations and large-scale repairs for condominiums and apartments in Chigasaki City. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. In urgent cases such as leaks, emergency measures may be possible, so please feel free to consult us. “I want it to last long with one renovation” “I want to keep costs as low as possible” “I want to improve insulation performance because the indoors are hot” We will propose the best solutions for your specific requests and future repair plans.

From temporary scaffolding work to roofing and exterior painting, all work is performed by our own team. We are confident that we will not be outdone in terms of cost, quality, and scheduling 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 the entirety of Tokyo.

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