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

Large-Scale Repairs for Condominiums, Apartments, and Buildings in Zushi City

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

Large-scale repairs are not just “exterior wall painting” or “waterproofing,” but a project that collectively 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 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 and compile them into a deterioration diagnosis report with photos, after which we will propose the scope of work.

Reasons Why Kakeru Koumuten is Chosen for Large-Scale Repairs in Zushi City

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

1. Equipment Specialized for Exterior Renovations

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

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale renovations and can assemble the scaffolding ourselves.
By 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 detached houses!

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, so we can provide swift responses in emergencies!

In-house Waste Sorting

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

Exterior Renovation Dedicated Showroom

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 providing 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 will conduct inspections and actual construction for each process!

3. Various Permits and Skilled Workers

We have obtained construction industry permits 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 investigators, so we can handle and conduct preliminary investigations of roofing materials containing asbestos.

4. Warranty and Aftercare

Large-scale repair work comes with warranties for most projects, including “painting work,” “substrate repair work,” and “waterproofing work”!
Aftercare is available every year, and we send out notification DM each year.

5. Flexible and Prompt Response

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

We can also address exterior walls and rooftops that cannot be checked from high places 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 emergency measures for sudden leaks! We will promptly attend to urgent requests!

6. Staff Development

Our staff creates various models for skill improvement and conducts practical training. Since different processing and techniques are required on-site, we regularly conduct skill enhancement education to ensure each staff member can respond appropriately. We also provide training on points to be careful of and areas to check during large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we will notify residents and visit neighbors to greet and explain the work, as well as install notice boards at entrances to display project schedules and announcements! We also ensure proper etiquette for visitors to minimize inconvenience to residents and neighbors.

8. Strict Quality Control

Each stage will be inspected by a responsible person, and detailed construction photos will be taken. We use film thickness inspection equipment and check sheets to ensure there are no oversights during inspections. When performing exterior wall painting or waterproofing work, we check the number of used paint cans to confirm that the specified amount of paint has been used, and we order paint in-house to prevent construction defects. Of course, we will also take photos of used paint and report them.

9. Exterior Wall Painting Color Simulation

9-1 Self-Color Simulation

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

*In Zushi City, there are landscape planning areas throughout the city, and there are standards for exterior wall colors. There is a scenic area called “Hirouyama/Zushi Coast,” and since there are district plans and building agreements, procedures may be necessary depending on the site. Having a color simulation screen will help facilitate explanations at the management association’s general meetings and community 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 performing 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 when metal siding is applied
・Simulation using accent materials such as cornices and louvers
・Simulation for roof painting or roof replacement work

With the exterior renovation simulation, you can minimize the risk of failure in image changes! We hope that by renovating the appearance of apartments and condominiums, it will help increase occupancy rates.

Estimated Costs for Major Repairs in Zushi City

The cost of major 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 major repairs are concentrated in the range of 750,000 to 1,500,000 yen per unit, with the most common price range being 1,000,000 to 1,250,000 yen. Note that the amounts in this survey do not include consumption tax and common temporary costs, so they differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “FY 2021 Survey on Major Repair Works for Condominiums” (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 “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 costs, 22.3% for temporary works, 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 not a criterion for judging the appropriateness of individual estimates.

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

*The above is an 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 use the amount obtained by multiplying the above national statistics (750,000 – 1,500,000 JPY per unit) by the number of units as a reference.

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

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

Examples of Unit Prices for Repair Work

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

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

“Good paint does not equal the right choice.” The best way to choose is to align when 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. For buildings near the sea that are exposed to sea breezes, choosing high-weather-resistant paint and specifications that include rust prevention for metal parts after washing off salt will 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 required 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.” If there is a shortfall, there are four main options.

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

Among the housing subsidies and assistance systems in Zushi City, there were no subsidies specifically targeting large-scale renovation work for condominiums found within the confirmed range (Kanagawa Prefecture also does not have subsidies targeting the work itself). The available options can be broadly categorized into four types. The eligibility and application status of these systems may change during the fiscal year, so please be sure to confirm with our company or each relevant office before signing a contract or starting work.(As of October 8, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs contributing to the longevity of certain qualifying condominiums are carried out, one-third of the property tax for the following year after construction will be reduced. The reduction rate is set by local governments based on the national reference standards (one-third, with municipalities able to set between one-sixth and one-half), and in Zushi City, it is one-third. Since the reduction rate varies by city, please be careful not to apply figures from articles or materials from other cities directly.

Source: Zushi City “Property Tax Reduction System (Housing Related)” (Updated June 1, 2026) / Zushi City “Public Comments on Partial Amendment of City Tax Ordinance (Draft)” (Updated October 10, 2023)

② Support for Condominium Management and Energy-Saving Subsidies in Zushi City, Kanagawa Prefecture (For Management Associations, Start Here)

In Zushi City, free management consultations by condominium management professionals are available by reservation. Additionally, the dispatch of condominium advisors from Kanagawa Prefecture is available for management associations within the prefecture, excluding Yokohama City, Kawasaki City, Sagamihara City, and Yokosuka City, and management associations in Zushi City can also utilize this service.

Source: Zushi City “Real Estate Registration Survey Consultation, Condominium Management Consultation, Real Estate Consultation” (Updated August 7, 2023) / Kanagawa Prefecture “Condominium Advisor Dispatch” (Updated June 26, 2026) / Zushi City “Reiwa 8 Existing Housing Insulation Renovation and Energy Conservation Subsidy” (Updated September 9, 2026) / Zushi City “Reiwa 8 Renewable Energy, Energy Conservation, and Energy Storage Equipment Introduction Subsidy” (Updated September 9, 2026) / Zushi City “Zushi City Priority Measures Acceleration Project Subsidy” (Updated October 2, 2026)

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

This is a system certified by Zushi City, which has been in operation since January of Reiwa 6 (2024). By receiving certification, you may be eligible for interest rate reductions on the “Condominium Common Area Renovation Loan” from the Japan Housing Finance Agency and Flat 35 (Maintenance and Preservation Type), and it is also related to one of the requirements for the Long Lifespan Promotion Tax System (certification alone does not guarantee a tax reduction). The certification is valid for five years and will expire if not renewed.

* There is no fee for applying for certification from Zushi City. The “Management Plan Certification Procedure Support Service” provided by the Condominium Management Center, used for prior confirmation, has a system usage fee of 10,000 yen per application, and there may be an additional examination fee for the prior confirmation. The process is as follows: prior consultation with a condominium management consultant, prior confirmation of compliance status, certification application, and city certification. Contact: Urban Development and Landscape Division (046-872-8124).

④ National Energy Conservation Support | Housing Energy Conservation 2026 Campaign

Changes for FY 2026The “Child-Rearing Green Housing Support Project” for FY 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 FY 2027, and it will not be implemented in FY 2028. 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 (Application for FY2026 has ended)

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

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

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

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

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

Building Conditions and Repair Points in Zushi City

Zushi City is located in the southeastern part of Kanagawa Prefecture, at the base of the Miura Peninsula. The city’s urban planning master plan (March 2024) describes the terrain as “a landscape surrounded on three sides by the gently opening Sagami Bay to the west and preserved hills.” The area around JR Zushi Station and JR Higashi-Zushi Station is positioned as a hub gathering commercial and business functions, while residential complexes and areas such as Kamegaoka District, Minamioka, Komyoji District, Zushi Highland, and Azalea are situated on elevated ground. The vicinity of Kozube Fishing Port retains a townscape reminiscent of a fishing port. The close proximity of urban areas around the station, residential areas on the hills, coastal areas, and lowlands along the Toko River and Ikego River, each with distinct characteristics, serves as a starting point for considering large-scale repairs in Zushi City.

Source: Zushi City “Population Statistics” (as of September 1, Reiwa 8, updated September 16, 2026) / Zushi City “Reiwa 6 Fiscal Year Zushi City Population Data Collection” (age categories as of January 1, Reiwa 6) / Zushi City Condominium Management Improvement Promotion Plan (formulated in October Reiwa 5. The figures are estimates at the time of planning) / Zushi City “Tsunami Hazard Map” (revised in March 2016 based on tsunami inundation estimates presented by the prefecture in March 2015) *Different survey dates are indicated for each table, hence the timestamps for each figure.

We will also confirm the composition of generations and households. As of January 1, Reiwa 6, the percentage of the population in three age groups is as follows: the youth population (ages 0-14) is 10.8%, the working-age population (ages 15-64) is 55.2%, and the elderly population (ages 65 and over) is 31.2%. Based on the population and number of households as of September 1, Reiwa 8, there are approximately 2.2 people per household. Since the three age groups and the population and number of households are based on different reference dates, these figures are merely a guideline. These are city-wide numbers and do not reflect the situation of individual building residents; the composition of generations varies even within the same city depending on the location.

Buildings in Zushi City are divided into “four faces”

Zushi City has significantly different environments depending on the area: the urban area around the station, residential complexes and housing areas in the hilly region, the seaside, and lowlands along the river. The type of major repairs that will be necessary for your building will vary depending on its location. Additionally, since the history of rebuilding and major renovations differs for each building, please consider the age of the building as a guideline.

Source: Zushi City Urban Planning Master Plan [Summary Version] (March 2024) / Zushi City “Building Agreements in Zushi City” (Updated December 23, 2025) / Zushi City “Requirements for Construction in Scenic Areas” (Updated February 28, 2023) / Zushi City “Zushi City Landscape Ordinance & Zushi City Landscape Plan” (Updated June 25, 2025) / Zushi City “Flood Inundation Area Map for the Designated Rivers, Takaokagawa and Ikegokagawa” *The names and locations of the areas correspond to those listed in the city’s documents, and the boundaries are not strictly defined.

According to the city’s plan, the number of condominium units accounts for about 20% of the total housing in the city. Additionally, there are plans to conduct exterior inspections on 81 buildings over 40 years old and management condition surveys on 117 buildings. The city has been operating a management plan certification system since January 2024, aiming for certification for 10 condominiums. The figures in the plan include estimates and do not represent the situation of all condominiums in the city.

Four Factors Unique to Zushi City that Damage Buildings

The contents of large-scale repairs vary depending on the location of the building. When investigating buildings in Zushi City, the following four factors are particularly checked. I will discuss based on the overall trends in the city, but the actual conditions differ from building to building, so it is essential to verify on-site.

Source: Zushi City “Tsunami Hazard Map” (Page updated on February 6, 2026) / Zushi City “Landslide Hazard Map” (Page updated on March 12, 2026) / Zushi City “Flood Inundation Area Map for the Designated Rivers, Tago River and Ikego River” / Zushi City “Zushi City Landscape Ordinance and Zushi City Landscape Plan” / Zushi City “Requirements for Construction in Scenic Areas” / Zushi City “Building Agreements in Zushi City” / Zushi City “Reiwa 6 Fiscal Year Zushi City Population Data Collection”

Key Issues to Address When Advancing Construction in Zushi City

* Kakeru Koumuten has five bases, including a showroom and material storage, located in Yokohama City, and we respond to consultations throughout Zushi City, including around Zushi Station, Higashi-Zushi, Kotsubo, Sakurayama, Ikego, Numama, Kuki, and Yamanone.

Signs of Deterioration Requiring Major Repairs and Timing

Generally, large-scale repairs are recommended every 12 to 15 years. According to a survey by the Ministry of Land, Infrastructure, Transport and Tourism, the actual repair cycle shows that 13 years is the most common, with about 70% falling within the 12 to 15 year range, and the cycle tends to shorten with repeated repairs. However, the actual determination should be based on the condition of deterioration rather than just the number of years, so if you notice symptoms like those listed below, we recommend an early on-site inspection.

Estimated repair cycles by part (Ministry of Land, Infrastructure, Transport and Tourism guidelines)

* The above are reference examples from the guidelines and are not uniform construction deadlines. 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 Creating Long-Term Repair Plans” (Reiwa 6, June revision – PDF) / Ministry of Land, Infrastructure, Transport and Tourism “Fiscal Year 2021 Survey on Large-Scale Renovation Work for Condominiums”

Examples of Large-Scale Renovation Work

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

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

Customer Feedback

Flow from On-site Survey to Completion of Construction

From inquiry to completion of construction 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 will allow for a smoother progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, it’s fine to just present those.
2. On-site Survey & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproof layers, and if necessary, use drones or thermal imaging to investigate the roof, high places, and leak areas. For properties in Zushi City, we will also check for rust on metal parts of buildings close to the sea, assess the risk of tsunamis, floods, and landslides on the site, and confirm the conditions of slopes and retaining walls, as well as the delivery route and parking.
3. Survey Report & Estimate Submission We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. Multiple plan proposals are also possible.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to landscape plans, scenic districts, district plans, and building agreements, we will also explain the procedures and considerations for color choices.
5. Notification to Residents & Neighbors We will distribute construction notifications, conduct greetings to neighbors, and set up a bulletin board at the entrance (with a schedule and laundry information). If temporary relocation of parking is necessary, we will coordinate this at this stage.
6. Temporary Scaffold Installation & Various Works Our own scaffold team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → metal parts & ancillary work in that order. A supervisor will inspect and take construction photos for each process.
7. Completion Inspection, Scaffold Dismantling & Handover We will confirm the finish in the presence of the customer and provide construction photos, a report on the paint used, and a warranty certificate.
8. Aftercare Maintenance We will send out annual DM notifications, 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

Just as important as the construction itself is “when, what, and with what materials we report”. At Kakeru Koumuten, we will provide materials and reports in the following four situations.

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

What Will Life Be Like During Construction? Impact on Residents

Large-scale repairs are principally carried out while residents remain in their homes. However, there will be some 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 Methods

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

Large-scale renovation work involves not only the construction itself but also potential troubles with residents and nearby neighbors. Therefore, it is necessary to report the progress of the work and information about laundry on bulletin boards to prevent issues before they arise. Kakeru Koumuten Co., Ltd. specializes in exterior work, so we receive many requests for exterior renovations of apartments and condominiums.

Check for warranties and aftercare services

When choosing a large-scale renovation company, make sure to check for warranties. If any issues such as leaks occur after the construction, having a leak warranty from the contractor means you can have it repaired at no cost, providing peace of mind! Companies that offer warranty periods demonstrate confidence in their work, which can be a criterion for selecting a contractor.

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

Kakeru Koumuten Co., Ltd. sends out annual direct mail for aftercare maintenance, allowing for yearly inspections. We also provide free assistance for simple repairs such as partial sealing.

Obtain estimates from multiple contractors (at least 3 companies)

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

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repairs and exterior painting,” and “confirmation of the process.” Carefully compare these details! If the quality of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price. Especially since substrate repair work is often not visible from the outside, ensure that the repair method is suitable for the condition of the substrate!

Check these points on the estimate (checklist)

Check if it is self-managed

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

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

Moreover, contractors that outsource to subcontractors may also face delays in response if any troubles occur during construction. It is advisable to avoid having a company that has not actually met with the customer manage the construction. Kakeru Koumuten performs everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, with knowledgeable and experienced personnel managing the construction!

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

Especially for management associations, it is necessary to decide “how to request” before “which company to hire.” The main ordering methods are 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 problem. The Ministry of Land, Infrastructure, Transport and Tourism issued warnings and notifications to management associations in January 2017 and April 2023, and on September 28, 2026, the Japan Fair Trade Commission announced that it had issued exclusion orders to 38 companies and a total of 1.63788 billion yen in payment orders to 37 companies regarding large-scale renovation work commissioned by condominium management associations to design consulting firms in the Kanto region (two design consulting firms were also subject to exclusion orders).

※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 vendor selection process in meeting minutes to ensure transparency
• Confirm the reasons for unusually low consulting fees
• Include a penalty clause in the contract for cases of collusion
• Avoid concentrating information with a single consultant and verify specifications independently

Zushi City Large-Scale Repair Frequently Asked Questions

How much does large-scale repair in Zushi City cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s fiscal year 2021 survey, 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 being 1,000,000 to 1,250,000 yen. Based on our company’s construction records, the cost for a two-story wooden apartment is approximately 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment it is about 4,000,000 to 9,000,000 yen, and for small condominiums or mixed-use buildings, it ranges from 5,000,000 to 15,000,000 yen. The costs vary depending on the condition of the substrate and whether waterproofing or roofing work is required, so we will provide an estimate through a free on-site survey.

How often should large-scale repairs be conducted?

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

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

For apartments, it typically takes 3 weeks to 2 months, for small condominiums or buildings, 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, while scaffolding is up, there may be restrictions on drying laundry outside and opening windows, so we take thorough measures to minimize the impact on daily life, such as distributing advance notices, providing information on the schedule and laundry 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 1 to 1.5 years for the establishment of the repair committee, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed comfortably. If you are using subsidies or tax incentives, please also factor in the time needed to obtain management plan certification (pre-confirmation and application to the city).

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

According to the official Zushi City website, there were no subsidies specifically for large-scale repair work on condominiums (Kanagawa Prefecture also does not offer subsidies for the work itself). However, if it is a condominium, you can use a one-third reduction in fixed property tax under the “Condominium Longevity Promotion Tax System” if certain conditions are met. Additionally, Zushi City offers free condominium management consultations and Kanagawa Prefecture provides free dispatch of condominium advisors (applications accepted until February 26, 2027). The city’s energy-saving subsidy for fiscal year 2026 has already closed, but for construction including windows and insulation, there may be eligibility for the national programs “Advanced Window Renovation 2026” and “Future 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 and starting work.

I heard that fixed property tax can be reduced through large-scale repairs; is that true?

It is true if the conditions are met. Under the Condominium Longevity Promotion Tax System, if a condominium that is over 20 years old and has more than 10 units conducts large-scale repairs (such as exterior painting, floor waterproofing, and roof waterproofing) that contribute to longevity, the fixed property tax for the following year will be reduced by one-third (the reduction ratio is specified by city ordinance). The application period for the national program is for work completed between April 1, 2023, and March 31, 2027, and applications should be directed to the Zushi City General Affairs Department Tax Division Property Tax Section (046-872-8161). Please check with the city for details on application deadlines and limits. For certified management plan condominiums, there are also requirements such as raising the repair reserve fund, which can take time to prepare, so it is recommended to start the process more than a year before the construction.

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

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

There are mainly four options: ① Postpone low-urgency work based on deterioration diagnosis to the next time, ② Review the scope and specifications of the work, ③ Check for support systems such as subsidies, ④ Consider increasing the repair reserve fund or financing from the Japan Housing Finance Agency. The agency’s financing for condominium common area renovations does not require collateral, and interest rates can be reduced by up to 0.6% per year by obtaining management plan certification and implementing energy-saving or seismic work. Please note that postponing waterproofing and tile peeling measures often ends up being more expensive, so please consult us for judgment on separation.

Can scaffolding be set up on sloped or uneven land?

Yes, it can. Zushi City is surrounded by hills on three sides and has a terrain that opens to Sagami Bay on the west side, where there are buildings on sloped or terraced lots in residential areas and housing complexes. Kakeru Koumuten Co., Ltd. owns its own scaffolding materials and has its own scaffolding team, allowing us to plan support and layout for the boards after checking the site. This is a part where additional costs can easily arise after seeing the site, so it is important to confirm the delivery route during the estimation stage. We also check for deterioration of retaining walls and slopes and consult whether they are included in the long-term repair plan.

What will happen to the residents’ parking during construction?

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

Can I freely decide the color of the exterior walls?

This depends on the regulations applicable to the property. Zushi City has a landscape planning area that covers the entire city, and there are standards for the color of exterior walls. Additionally, there is a scenic area called “Hirouyama and Zushi Coast,” and within the city, there are four building agreements, one district plan, one landscape agreement, and ten self-regulatory agreements by neighborhood associations, each differing by area. You can check what regulations apply to your property by contacting the Zushi City Urban Development and Landscape Division (046-872-8124). Our company will also investigate this during our survey and share a color simulation to help facilitate agreement with the management association and neighbors.

Do buildings near the sea require salt damage measures?

Zushi City faces Sagami Bay, and buildings close to the sea may have salt carried by sea breezes adhering to exterior walls, metal parts, and fittings, accelerating rust progression. However, the extent of the impact varies depending on the distance from the sea, direction, and height of the building, so it cannot be said that it is universally necessary. We will check the progression of rust on metal parts and fittings during the on-site survey, and after thoroughly washing off the salt with high-pressure cleaning, we will propose specifications that include highly weather-resistant paint and rust prevention.

Which 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, additional consulting fees apply, and there are risks of conflicts of interest and collusion to be aware of. 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 on the same level as other companies.

How can I detect collusion in large-scale repairs?

There are three typical tactics: 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 partner companies, creating collusion, ③ Adding a portion of the contract amount as a back margin to the construction costs. Countermeasures include obtaining independent estimates, consulting with a neutral third party, documenting the selection process in 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 under the same conditions, while making detailed breakdowns mandatory instead of accepting “one set” notation, the differences in amounts will be clear as to whether they are due to differences in range or unit prices.

What is the difference if you have your own scaffolding?

In large-scale repair work, 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, it is easier to control costs in this area, and our in-house scaffolding team can flexibly respond to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffolding materials for approximately 100 single-family homes and plans according to the site, even in areas with slopes or height differences.

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 thermography or drones and propose the minimum necessary repairs.

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

Yes, we can. We have qualified personnel such as asbestos work supervisors and investigators of buildings containing asbestos materials, and we handle everything from the legally mandated preliminary surveys to the cover method and removal of asbestos-containing roofing materials. If there is sprayed asbestos, we will also provide guidance on the investigation of contents, removal procedures, and legal processes.

What happens if large-scale repairs are not done?

There are risks such as personal injury accidents due to falling exterior wall tiles, structural deterioration due to corrosion of 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 probing, etc., are required under certain conditions, such as if more than ten years have passed since completion or exterior wall renovations for tiles or mortar-finished walls. Zushi City is under the jurisdiction of Kanagawa Prefecture, and it is necessary to confirm whether general condominiums and apartments are included in the list of applicable uses and scales from the prefecture or the Building Safety Division. Even if not subject to statutory investigation, regular inspections and maintenance are essential, so please consult us if you are unsure about your judgment.

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

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

If you are looking for a large-scale repair contractor in Zushi City, contact Kakeru Koumuten

Our company handles many exterior wall renovations and large-scale repairs for condominiums and apartments in Zushi City. 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 optimal 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 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 all of Tokyo.

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