Leave the repairs and renovations of condominiums and apartments in Tsurumi, Yokohama City to Kakeru Koumuten Co., Ltd.!

Large-Scale Renovations for Condominiums, Apartments, and Buildings in Tsurumi Ward, Yokohama

Large-scale repair work that can be handled in Tsurumi Ward, Yokohama

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 always necessary to carry out all of the above works. The extent of the work will be determined based on the results of the building diagnosis. At Kakeru Koumuten, we conduct a free on-site survey to confirm the items below, compile them into a deterioration diagnosis report with photos, and propose the scope of work.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Tsurumi Ward, Yokohama

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

1. Equipment Specialized for Exterior Renovation

At Kakeru Koumuten, we have prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior wall painting and waterproofing work for large-scale repairs. 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 repairs and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs for 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 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, since we always have stock available, we can respond quickly even in emergencies!

In-house Waste Separation

During large-scale repairs, various waste materials such as leftover paint, metal, and wood are generated. At Kakeru Koumuten, we sort and recycle waste materials in-house, leading to cost reductions in waste disposal fees.

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 insulation tests using a heat insulation testing machine are also available!

2. Cost Reduction through In-House Management and Construction

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

From inquiries to project completion, everything is managed by Kakeru Koumuten in a consistent system, allowing for high-quality large-scale repairs at reduced costs. Additionally, one representative will handle everything from the estimate to project completion. Since the person in charge does not change, smooth communication is possible.

We can fully handle everything from temporary scaffolding installation to exterior wall painting, substrate repairs, waterproofing work, and tile repairs with our own team! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Various Permits and Skilled Workers

We have obtained construction business licenses and permits for industrial waste collection and transportation! We also have nationally certified sheet metal and painting 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 material asbestos surveyors, so we can manage asbestos-containing roofing materials and conduct preliminary surveys.

4. Warranty and Aftercare

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

5. Flexible and Prompt Response

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

We can also address exterior walls and rooftops that cannot be inspected from high places using drones! During 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 respond quickly to urgent requests!

6. Staff Development

Our staff create various models to improve their skills and conduct practical training. Since different sites require various processing and techniques, we regularly provide skill enhancement education to ensure each staff member can respond effectively. We also educate on points to be careful of and areas to check during each phase of large-scale repair work.

7. Consideration for Residents and Neighbors

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

8. Strict Quality Control

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

9. Exterior Wall Painting Color Simulation

9-1 Self Color Simulation

The simulations 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 simulating and then changing to a two-tone color or making an image change, we hope to enhance the stylish appearance and contribute to an increase in occupancy rates! Of course, we can also arrange paint samples for actual color confirmation.

* There are areas in Tsurumi Ward where building agreements and district plans are established, and the color of the exterior walls may need to harmonize with the surroundings. Having a color simulation screen will make explanations at neighborhood associations and general meetings proceed smoothly.

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

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

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

Cost Estimates for Major Repairs in Tsurumi Ward, Yokohama City

The cost of major repairs varies greatly depending on the size of the building, the degree of deterioration, the scope of work, and the materials used. First, refer to the national average based on public statistics, then to our company’s cost estimates based on construction performance by scale, and finally to unit price examples for each project.

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

According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which compiled 818 construction cases (FY 2021), the construction costs for major repairs are concentrated at about 70% 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. Yokohama City also indicates on its official website that the cost is approximately 1,000,000 to 1,300,000 yen per unit. Please note that the amounts in this survey do not include consumption tax and common temporary construction costs, so the conditions differ from the current total construction costs including tax.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Repair Work for Condominiums in FY2021” (200 companies, 818 cases) / Yokohama City “Market Prices for Large-Scale Repair Costs and How to Address Shortfalls in Repair Reserves” *Amounts do not include consumption tax or common temporary construction costs. Percentages may not total 100% due to rounding and non-responses.

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

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Repair Work for Condominiums in FY2021” (Second survey of large-scale repair work. Overall average is construction-related 59.0%, temporary construction 22.3%, miscellaneous expenses 9.9%). *The total does not equal 100% because equipment-related work, exterior works, and others are included. This is an average value and is not a criterion for judging the appropriateness of individual estimates.

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

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

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

The estimate for large-scale repairs 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 of charge.

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

“Good paint does not always equal the right choice.” Aligning when to perform the next major repair with the lifespan of the materials is the most efficient way to choose.

*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 due to location, sunlight exposure, and ventilation, so it is important to check the condition of each side through a site survey and select paint suitable for the location to improve durability.

Estimated Repair Reserve Fund 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 Reiwa 5 Fiscal Year Comprehensive Survey of Condominiums, 36.6% of management associations reported that “the repair reserve fund is insufficient compared to the plan.” There are four main options when there is a shortfall.

Subsidies, Tax Systems, and Loans to Confirm for Large-Scale Renovations in Tsurumi Ward, Yokohama City

Both Yokohama City and Kanagawa Prefecture do not have subsidies specifically for large-scale renovation work itself. The available options can be broadly categorized into the following four types. The eligibility and application status of the systems may change even during the fiscal year, so please be sure to confirm with our company or the respective offices before contracting or starting work. (As of October 8, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs (including exterior painting, floor waterproofing, and roof waterproofing) that contribute to the longevity of certain qualifying condominiums are carried out, the property tax amount for the following year will be reduced by half (up to the equivalent of 100㎡ per unit; urban planning tax is not included).

* The national leaflet shows the range of reduction percentages as a nationwide system. The reduction percentage for Yokohama City is 50%.

② Support for Condominium Management in Yokohama City (For Management Associations, Start Here)

The support system in Yokohama City is mostly based on the requirement of registration in the “Yokohama City Condominium Registration System” (free). Management associations that are not yet registered should start here.

Source: Yokohama City “Support and Subsidy System List by Concerns for Condominium Management Associations” / Long-term Repair Plan Creation Promotion Model Project / Dispatch of Condominium Advisors / Yokohama Condominium Portal

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

This is a system certified by Yokohama City. Once certified, it allows for a 0.2% reduction in loan interest rates from the Japan Housing Finance Agency, preferential interest rates for Flat 35, and meets one of the requirements for the Long-term Durability Promotion Tax System (certification alone does not guarantee tax reduction). The main criteria include holding general meetings at least once a year, maintaining management regulations, separate accounting for management fees and repair reserves, overdue amounts within 10% of the total, and “having created or reviewed a long-term repair plan that includes large-scale repair work twice or more over a period of 30 years or more within 7 years.”

*Fees include a system usage fee of 10,000 yen + city application fee of 3,900 yen, among others. It takes 2 to 3 months from application to certification. The validity period of the certification is 5 years.

④ National Energy Saving Support | Housing Energy Saving 2026 Campaign

Changes for Fiscal Year 2026The “Child-Rearing Green Housing Support Project” for Fiscal Year 2025 has been abolished and reorganized into the successor “Mirai Eco Housing 2026 Project.” Additionally, the “Long-term Quality Housing Renovation Promotion Project” will end in Fiscal Year 7 and will not be implemented in Fiscal Year 8. Please be careful not to establish financial plans based on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Applications for Fiscal 2026 have ended)

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

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

When the 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 Tsurumi Ward, Yokohama City

Tsurumi Ward, Yokohama City, was incorporated into Yokohama City on October 1, 1927, and is the ward that was established. According to ward documents, it is formed from the hilly area in the northwest, lowlands of the Tsurumi River basin, and reclaimed land in the coastal area, where large companies have established factories, developing as the core of the Keihin industrial zone. On the other hand, from the post-war period to the period of high economic growth, houses were built in hilly and rural areas, and in recent years, there has been a shift from factories to residential use. Since factories, warehouses, commercial buildings in front of stations, and residential condominiums coexist in the same ward, the way buildings deteriorate and the method of scaffolding varies depending on the location.

Source: Yokohama City “Population News” as of December 1, Reiwa 7 (Estimated)／Yokohama City Tsurumi Ward “Profile of Tsurumi Ward” (Proportion of Elderly Population・Geography)／Yokohama City “Data on Greenery” (Reiwa 1 Fiscal Year)／Yokohama City “Building Agreement (Tsurumi Ward)”／Yokohama City Tsurumi Ward “Overview of Tsurumi Ward”

Buildings in Tsurumi Ward are divided into “four types”

Tsurumi Ward has different historical developments depending on the location, so not only the age of the building but also the location of the building (reclaimed land in the coastal area, lowlands along the Tsurumi River and around the station, residential areas in hilly regions, and blocks converted from factories) will affect the nature of the major repairs needed in the next round. Please check which type your building falls into.

Source: Yokohama City Tsurumi Ward “Overview of Tsurumi Ward” / Same “Profile of Tsurumi Ward” / Same “History of Tsurumi”・“Industries of Tsurumi” (excerpts from book published in Heisei 11) / Yokohama City “Building Agreement (Tsurumi Ward)” / Yokohama City “Tsurumi Shioda and Honcho Street Guidance Area”・“Tsurumi 1-Chome District”

Four Unique Factors in Tsurumi Ward That Damage Buildings

Among the characteristics of Tsurumi Ward visible from Yokohama City’s public documents, we have organized four factors that lead to large-scale repairs.

Source: Yokohama City Tsurumi Ward “Profile of Tsurumi Ward”／Yokohama City “Flood Hazard Map (Tsurumi Ward Version)”／Yokohama City Fire Department “Liquefaction Hazard Assessment (Tsurumi Ward)” (PDF)／Yokohama City “Data on Greenery”／Yokohama City “Building Agreement (Tsurumi Ward)”・“District Plan”・“Tsurumi 1-Chome District”／Ministry of Land, Infrastructure, Transport and Tourism “FY2023 Comprehensive Survey on Condominiums” (PDF)

Key Points to Consider When Advancing Construction in Tsurumi Ward

*Kakeru Koumuten has five bases in Yokohama City and serves all areas of Tsurumi Ward, including Tsurumi, Namamugi, Yako, Shimosueyoshi, Komagata, Kitatera, Daikokucho, and Suehirocho.

Deterioration Symptoms and Timing Requiring Major Repairs

Generally, major repairs are recommended every 12 to 15 years. According to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, 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 repeated repairs. However, the actual decision should be based on the condition of deterioration rather than just the number of years, so if you observe symptoms like those below, we recommend an early on-site inspection.

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

*The above are reference examples from the guidelines and are not uniform construction deadlines. Actual cycles will be set according to the 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 Co., Ltd. The building had leaks occurring in several places, and we combined clear waterproofing for the tile exterior wall with rooftop waterproofing for the renovation.

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

Customer Feedback

Flow from On-site Survey to Completion of Construction

From inquiry to completion of construction and aftercare, one representative will consistently handle your case. In the case of management associations, a resolution at the general meeting is necessary, so starting the process 1 to 1.5 years before the desired start date will allow for a smoother progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, it’s fine to just present those.
2. On-site Investigation & Building Diagnosis (Free) We will conduct an exterior wall inspection, check for cracks, sealing, and waterproofing layers, and if necessary, investigate the rooftop, high places, and leak areas using drones or thermal imaging. For properties in Tsurumi Ward, we will also check the location such as coastal areas, lowlands, and hilly areas, as well as the elevation differences of the site, road width and delivery routes, drainage, parking, and distance to neighboring properties.
3. Submission of Investigation Report & Estimate We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. Multiple plan proposals are also possible.
4. Plan Decision & Contract Confirm colors using color simulations, paint samples, and trial painting. For management associations, we will assist in preparing materials for general meetings. In areas subject to district planning or building agreements, we will also explain the considerations for color choices.
5. Notification to Residents & Neighbors We will distribute construction notifications, conduct greetings to neighbors, and install a bulletin board at the entrance (construction schedule and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
6. Installation of Temporary Scaffolding & Various Works Our own scaffolding team will set up the scaffolding, followed by high-pressure washing → substrate repair → sealing → exterior wall painting & tile repair → waterproofing → iron parts & ancillary work in that order. A supervisor will inspect each process and take construction photos.
7. Completion Inspection, Scaffolding Dismantling & Handover We will confirm the finished work 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 annual DM notifications, and inspections can be conducted every year. Simple repairs such as partial sealing are provided free of charge.

Resident Communication, Approval for Additional Work, Inspection Reports

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

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

How Will Life Be During Construction? Impact on Residents

For large-scale repairs, the principle is to proceed while you continue to live in your home. However, there will be some restrictions on daily life while scaffolding is in place. Most troubles can be prevented by providing prior notice, so at Kakeru Koumuten, we thoroughly explain and post information before the work begins.

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

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

Have Extensive Experience in Large-Scale Repairs

Large-scale repair contractors often have websites that showcase their exterior renovation 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 Google and review sites to evaluate large-scale repair contractors can also be effective when comparing them! Be cautious if there are many negative reviews. If there are few reviews, also check their project achievements, explanation content, and management system.

Large-scale repair work involves not only the construction itself but also the potential for troubles with residents and nearby neighbors. Therefore, it is necessary to post updates on 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, and we receive many requests for exterior renovations of apartments and condominiums.

Check for Warranty and Aftercare Services

When choosing a large-scale repair company, let’s confirm the presence of a warranty. If any issues such as leaks occur after the work is completed, having a leak warranty from the contractor ensures that repairs can be made at no cost, providing peace of mind! Companies that offer a warranty demonstrate confidence in their work, which can serve as a criterion for selecting a contractor.

Warranty periods vary depending on the contractor and the nature of the work, but it is common to have a range from 1 to 10 years. Emergency repairs or partial fixes often do not come with a leak warranty. Some contractors also provide aftercare services separate from the warranty, so it is important to check for the presence of warranties and aftercare services.

At Kakeru Koumuten Co., Ltd., we send out annual direct mail for aftercare maintenance, allowing for yearly inspections. For simple repairs such as partial sealing, we respond at no charge.

Obtain Estimates from Multiple Contractors (at least 3 companies)

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

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for substrate repair and exterior wall painting,” and “confirmation of the process”. Avoid making decisions based solely on cost, as lower-quality materials or skipping steps can reduce expenses. Especially since substrate repair work is often not visible from the outside, it is essential to verify whether the repair method is appropriate for the condition of the substrate!

Check These Points on the Estimate (Checklist)

Confirm if it is managed in-house

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

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

Additionally, contractors that outsource may have delayed responses in case of any troubles during construction. It is safer to avoid companies that do not have direct meetings with customers managing the construction. Kakeru Koumuten performs everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, managed by knowledgeable and experienced personnel!

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

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

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

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

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

Three Typical Methods

Source: Yokohama City “What is collusion in large-scale repair work for condominiums?” / Ministry of Land, Infrastructure, Transport and Tourism “On the Proper Ordering of Large-Scale Repair Work for Condominiums” (Notification dated April 3, Reiwa 5, PDF)

Self-Defense Measures for Management Associations

• Obtain independent estimates from multiple companies
• Consult with neutral third parties such as condominium management 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

New System in Yokohama City Bid Agency Service for Large-Scale Repair Work

In response to this issue, in October 2025, Yokohama City and the Yokohama City Housing Supply Corporation established the “Bid Agency Service for Large-Scale Repair Work.” This system separates the selection of design and construction companies, with the corporation acting as a third party to conduct conditional general competitive bidding. The estimated price will not be disclosed and will be conducted in accordance with public works methods.

Source: Yokohama City Press Release (October 16, 2025) / Yokohama City Housing Supply Corporation

Frequently Asked Questions about Large-Scale Repairs in Tsurumi Ward, Yokohama

How much does large-scale repair in Tsurumi Ward, Yokohama cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey for the fiscal year 2021, about 70% fall within the range of 750,000 to 1,500,000 yen (excluding consumption tax and common temporary costs), with the most common range being 1,000,000 to 1,250,000 yen. Yokohama City also indicates “approximately 1,000,000 to 1,300,000 yen per unit.” Based on our construction records, the estimated costs are 2,000,000 to 4,000,000 yen for wooden two-story apartments, 4,000,000 to 9,000,000 yen for three-story steel and RC apartments, and 5,000,000 to 15,000,000 yen for small condominiums and mixed-use buildings. The costs vary depending on the condition of the substrate and whether waterproofing and roofing work is required, so we provide free on-site estimates.

How often should large-scale 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 12 to 15 years. However, the decision should be based on the condition of deterioration rather than just the number of years. If deterioration of sealing, tile lifting, or breaks in the waterproof layer are observed, it is advisable to carry out repairs without waiting for the cycle, as this can ultimately reduce costs. Older buildings tend to have a greater proportion of tile repairs and metal part replacements in the second and third repairs.

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

For apartments, the period is approximately 3 weeks to 2 months, for small condominiums and buildings it is about 1.5 to 3 months, and for condominiums with more than 50 units, it takes around 4 to 6 months. Residents can remain in their homes during the construction. However, while scaffolding is in place, there may be restrictions on drying laundry outside and opening windows, so we take thorough measures to minimize the impact on daily life, such as distributing notifications before construction, providing information on the schedule and laundry on bulletin boards, and strictly adhering to working hours.

How long should we 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 the repair committee, conducting building diagnostics, selecting contractors, and passing resolutions at general meetings, followed by 3 to 6 months for construction. Overall, it is advisable to plan for about 2 years to proceed comfortably. If using subsidies or tax incentives, please also factor in the time to obtain management plan certification (2 to 3 months from application to certification).

Are there any subsidies available for large-scale repairs in Tsurumi Ward, Yokohama?

Neither Yokohama City nor Kanagawa Prefecture provides subsidies specifically for large-scale repair work. However, for condominium owners, if certain requirements are met, there are benefits such as a 50% reduction in fixed property tax under the “Condominium Longevity Promotion Tax System,” subsidies from Yokohama City for deterioration diagnosis and long-term repair planning (50% up to 200,000 yen), and subsidies for barrier-free renovations in common areas (one-third up to 300,000 yen). If the work includes windows and insulation, it may be eligible for “Advanced Window Renovation 2026” and “Mirai Eco Housing 2026.” The timing of applications and applicants varies by program, so please check the eligibility conditions and application procedures for each program before contracting or starting work.

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

It is true if the requirements are met. Under the 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 (including exterior painting, floor waterproofing, and roof waterproofing), the fixed property tax for the following year can be reduced by half for up to 100 square meters per unit. This applies to work completed between April 1, 2023, and March 31, 2027, and a declaration must be made to the Tsurumi Ward Office within three months of completion. For certified management plan condominiums, there are additional requirements such as raising the repair reserve fund, which takes time to prepare, so it is recommended to start the process more than a year in advance.

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

Yes. 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 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” began accepting bulk applications for apartment buildings starting May 29, 2026 (application procedures are handled by registered contractors). Please be careful not to base your financial plans on outdated information.

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

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

Can you handle large-scale repairs for properties with many buildings like a housing complex?

You can consult us. Tsurumi Ward is formed from hilly areas in the northwest, lowlands in the Tsurumi River basin, and reclaimed land in the coastal area, and it is said that the conversion from factories to residential use is also progressing (according to the ward’s official page). For properties with many buildings, it is important to conduct deterioration diagnosis for each building, create a process plan for whether to do it all at once or divide it by building or year, and form consensus at the general meeting. Kakeru Koumuten Co., Ltd. also targets condominiums with over 100 units as a cost estimate and will propose multiple process plans for comparison.

What happens to the residents’ parking during construction?

Vehicles on the side where scaffolding is to be erected will need to be temporarily moved. In buildings with limited parking space, 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?

In Tsurumi Ward, there are three building agreements listed by Yokohama City (Daikokucho Industrial Park, Suehiro Factory Park, Namamugi Factory Park / updated April 15, 2026), and two district plans are established: Tsurumi Shioda and Honcho-dori Streetscape Guidance Area and Tsurumi 1-chome Area. The presence and content of agreements regarding appearance and color vary by agreement and plan; for example, the district plan for Tsurumi 1-chome has stipulations regarding the color tones of buildings and the colors of roofs, exterior walls, and advertisements for each area. You can check what applies to your property through the public information on Yokohama City’s building agreements and district plans, and the Yokohama City Urban Development Bureau’s Community Development Division (045-671-2667) also provides information on district plans. We will also investigate this during our survey. Sharing a color simulation of the completed image can facilitate discussions with neighbors and community associations.

Are there differences in construction depending on the location, such as coastal areas, lowlands, and hilly areas?

Tsurumi Ward is formed from hilly areas in the northwest, lowlands in the Tsurumi River basin, and reclaimed land in the coastal area, according to the ward’s materials. Depending on the location, there may be differences in slopes, elevation differences of the site, road widths, and building sizes, which may require ingenuity in setting up scaffolding and transporting materials. Kakeru Koumuten Co., Ltd. has its own scaffolding team that checks the site and plans the transportation route and scaffolding layout. Additionally, Yokohama City has published a flood hazard map (flood, internal water, storm surge) for Tsurumi Ward, so we also focus on inspecting rooftop drains, drainage areas, and the condition of waterproof layers in preparation for heavy rain. 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?

In cases 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, consulting fees are incurred separately, and there are risks of conflicts of interest and collusion that need to be considered. 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 with other companies on the same level.

How can I detect collusion in large-scale repairs?

There are three typical methods: ① Pre-determining the contractor and having other companies submit only formal high estimates, known as “dummy estimates,” ② A consultant contracts at an extremely low design supervision fee and receives kickbacks from partner companies, indicating collusion, ③ Adding a portion of the contract amount as a back margin to the construction costs. Countermeasures include obtaining independent estimates, consulting with neutral third parties, documenting the selection process in meeting minutes, and including penalty clauses in contracts. In October 2025, Yokohama City and the Yokohama City Housing Supply Corporation will establish a “Large-Scale Repair Work Bidding Agency Service.”

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

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

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

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

Yes, we can. We have qualified personnel who are certified as asbestos work supervisors and building material surveyors for asbestos-containing materials. We handle everything from the legally required preliminary surveys to the roof overlay (cover method) and removal of asbestos-containing roofing materials. If there is sprayed asbestos, you may be eligible for free surveys under Yokohama City’s countermeasures project and receive up to two-thirds (maximum 3 million yen) of the cost for removal and other construction, so we will provide guidance on that as well.

What happens if large-scale repairs are not done?

There are risks such as personal injury from falling exterior wall tiles, structural deterioration due to corrosion of rebar, leaks, and a decrease in asset value. Furthermore, for buildings subject to periodic reporting under Article 12 of the Building Standards Act, investigations through full tapping and other methods are required under certain conditions, such as when more than 10 years have passed since completion or exterior wall renovations for tiles or mortar-finished walls. In Yokohama City, buildings that are only apartment complexes are not designated as subject to periodic reporting, but mixed-use buildings that include stores require individual confirmation. 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 wooden two-story buildings with 6 to 10 units, the estimate is around 2 million to 4 million yen, and for three-story steel or RC buildings with 10 to 20 units, it is around 4 million to 9 million yen based on our company’s track record (including scaffolding, substrate repairs, exterior wall painting, sealing, and waterproofing). It is common 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 Tsurumi Ward, Yokohama, contact Kakeru Koumuten Co., Ltd.

Our company is based in Yokohama City and has handled many exterior wall renovations and large-scale repairs for condominiums and apartments in Tsurumi Ward. 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 also be possible, so please feel free to consult us. “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 room is hot”, we will propose the best solutions for your specific requests and future repair plans.

From temporary scaffolding work to roofing and exterior wall painting, all work is performed by our own team. We are confident that we will not lose in terms of cost, quality, and scheduling compared to other companies, so we welcome competitive estimates!

Large-Scale Repair Work Service Area

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

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