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

Large-Scale Repairs for Condominiums, Apartments, and Buildings in Tsuzuki Ward, Yokohama

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

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

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

The reason why we can be entrusted with large-scale repairs in Tsuzuki 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 Renovations

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

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale repairs 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 own enough scaffolding materials for approximately 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 procure materials at a lower cost! Additionally, we always have stock available, allowing us to respond quickly in emergencies!

In-house Waste Separation

In large-scale repairs, various waste materials such as waste paint, metal, and wood are generated. At Kakeru Koumuten, we separate and recycle waste materials in-house, which helps reduce waste disposal costs.

Showroom Dedicated to Exterior Renovations

In the showroom, you can not only have meetings but also check actual samples and colors of exterior materials. You can also perform color simulations for exterior wall painting and check heat insulation properties using a heat insulation testing machine!

2. Cost Reduction through In-House Management and Construction

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

By managing everything from inquiries to project completion in a unified system, we can keep costs down while ensuring high-quality large-scale repairs. Additionally, one representative will handle everything from the estimate to project completion. Since the person in charge does not change, communication can be smooth.

We can handle everything from temporary scaffolding installation to exterior wall painting, substrate repair, waterproofing work, and tile repairs with complete in-house construction! Those with specialized knowledge and experience will conduct inspections and actual construction for each process!

3. Obtaining Various Permits and Skilled Workers

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

4. Warranty and Aftercare

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

5. Flexible and Prompt Response

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

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

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

6. Staff Development

Our staff create various models for skill improvement 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 appropriately. We also educate on points to be careful of and areas to check in each process of large-scale repair work.

7. Consideration for Residents and Neighbors

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

8. Strict Quality Control

Each stage of the process will be inspected by a responsible person, and detailed construction photos will be taken. We use film thickness inspection machines and check sheets to ensure that no inspections are missed. During exterior wall painting and waterproofing work, we will check the number of used paint cans to confirm that the specified amount of paint is being used, and we will 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 we create can be done using actual photos of your apartment or building!You can also perform the simulation on your smartphone or computer. By simulating and then changing to a two-tone color or a new image, we hope to enhance the stylish appearance and increase the occupancy rate! Of course, we can also arrange paint samples for actual color confirmation.

* In Tsuzuki Ward, there are district plans and building agreements that may specify regulations regarding exterior wall colors and procedures. Having a color simulation screen can 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 perform a test paint on your exterior wall. By conducting a test paint, you can confirm the actual color and gloss!

9-3 Exterior Renovation Simulation

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

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

Estimated Costs for Major Repairs in Tsuzuki Ward, Yokohama City

The cost of major repairs varies significantly 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 estimates based on past construction records by scale, and finally to examples of unit prices for each project.

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

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

Source: Ministry of Land, Infrastructure, Transport and Tourism “Survey on Large-Scale Renovation Work for Condominiums in FY2021” (200 companies, 818 cases) / Yokohama City “Market Prices for Large-Scale Renovation 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 Renovation Work for Condominiums in FY2021” (Second survey of large-scale renovation work. Overall average is construction-related 59.0%, temporary construction 22.3%, miscellaneous expenses 9.9%). *The total does not equal 100% because it includes equipment-related work, exterior works, and others. This is an average value and not a criterion for judging the appropriateness of individual estimates.

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

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

Breakdown of Costs for Scaffolding, Substrate Repair, Exterior Walls, and Waterproofing

The estimate for large-scale repairs is broadly divided into “Scaffolding,” “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 depending on shape, quantity, substrate condition, and type of materials. If you would like a detailed estimate, please feel free to contact us. Estimates are completely free.

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

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

* The estimated lifespan is a general guideline and may vary depending on sunlight, location, and substrate condition. For areas exposed to strong rain, wind, and sunlight, choosing high-weather-resistant paint and specifications that include rust prevention for metal parts after cleaning will improve 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 unit area. An additional charge is required if there is a mechanical parking lot.

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

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

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

Neither Yokohama City nor Kanagawa Prefecture offers subsidies specifically for large-scale renovation work. The available options can be broadly categorized into the following four types. The eligibility and application status of 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 100㎡ per unit; urban planning tax is not included).

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

The support system in Yokohama City is primarily based on registration in the “Yokohama City Apartment 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 / Condominium Advisor Dispatch / Seismic Reinforcement Subsidy for Specific Buildings / Yokohama Condominium Portal

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

This is a system certified by Yokohama City. Upon certification, the loan interest rate from the Japan Housing Finance Agency is reduced by 0.2% per year, there are interest rate benefits for Flat 35, and it meets one of the requirements for the Long-life Promotion Tax System (certification alone does not guarantee tax reduction). The main criteria include holding general meetings at least once a year, organizing management regulations, separating accounting for management fees and repair reserves, ensuring that the amount of arrears is within 10% of the total, and “having created or reviewed a long-term repair plan that includes large-scale repair work twice or more within 30 years, 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 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 will not be implemented in FY 2028. 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 the 2026 Fiscal Year have Ended)

* The Existing Housing Energy Efficiency 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, the Housing Finance Agency’s “Condominium Common Area Renovation Loan (Condominium Sumairu Loan)” can be utilized.

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

Cases where fire insurance can be used and cases where it should not be used

Building Conditions and Repair Points in Tsuzuki Ward, Yokohama City

Tsuzuki Ward, Yokohama City, was established on November 6, 1994, through the reorganization of Kohoku Ward and Midori Ward, making it one of the newer wards in Yokohama City. Approximately half of the area is occupied by Kohoku New Town, primarily used for residential and commercial/business facilities. The terrain consists of lowlands along the Tsurumi River system, the Tama Hills to the west, and the Shimo-Sumiyoshi Plateau to the east, featuring a mix of small hills and valleys. The presence of planned blocks in Kohoku New Town, existing urban areas outside the new town, and lowlands and industrial areas along the Tsurumi River, all within the same ward, serves as a starting point for considering large-scale repairs in Tsuzuki Ward.

Source: Tsuzuki Ward Statistical Overview “Statistics of Tsuzuki” (Reiwa 7)／Tsuzuki Ward “Overview of Tsuzuki Ward”／Tsuzuki Ward “Historical Timeline”／Yokohama City “District Planning (Tsuzuki Ward)”／Yokohama City “Building Agreement (Tsuzuki Ward)”

Let’s also confirm the composition of generations. The percentage of elderly population (65 years and older) in Tsuzuki Ward is 19.8%, which is the second lowest among the 18 wards (as of September 30, Reiwa 7, based on the Basic Resident Register. The overall percentage for Yokohama City is 25.2%). According to the overview of the ward, the number of people per household is the highest among the 18 wards, indicating a high number of family households. This is a trend for the entire ward and does not reflect the situation of individual building occupants.

Buildings in Tsuzuki Ward are divided into “four faces”

The buildings in Tsuzuki Ward reflect the history of urban development, which has become a characteristic of each location. Depending on where your building is located, the major repairs required in the next large-scale renovation will vary. Please note that the history of rebuilding or large-scale renovations differs for each building, so the age of the building should be viewed as a guideline.

Source: Tsuzuki Ward “Historical Timeline” (Announcement of the Kohoku New Town Development Project in 1965, Opening of the subway between Shin-Yokohama and Azamino in 1993, Birth of Tsuzuki Ward in 1994, Completion of the Kohoku New Town Land Readjustment Project in 1996, Completion of the Central Area in 2005) / Overview of Tsuzuki Ward / Yokohama City “District Plan (Tsuzuki Ward)” / Yokohama City “Building Agreement (Tsuzuki Ward)”

Four Unique Factors in Tsuzuki Ward That Damage Buildings

The content of large-scale repairs varies depending on the location of the building. When investigating buildings in Tsuzuki Ward, we particularly check the following four factors. While I will discuss based on the overall trends in the ward, the actual conditions differ from building to building, so we will always confirm on-site.

Source: Overview of Tsuzuki Ward / Yokohama City “Flood Hazard Map (Tsuzuki Ward Version)”・“What is a Flood Hazard Map?” / Tsuzuki Ward “Disaster Prevention Map” / Yokohama City “Building Agreements (Tsuzuki Ward)”

Key Points to Consider When Advancing Construction in Tsuzuki Ward

* Kakeru Koumuten has five locations in Yokohama, including a showroom and material storage, and we handle inquiries throughout Tsuzuki Ward, including Center Kita, Center Minami, Nakacho-dai, Chigasaki, Eda, and Kawawa.

Signs of Deterioration Requiring Major Repairs and Timing

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

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

*The above are reference examples from the guidelines and are not uniform construction deadlines. Actual cycles will be set according to the building’s specifications, location conditions, and deterioration status.

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

Examples of Large-Scale Renovation Work

This is an example of exterior renovation work on a mixed-use building undertaken by Kakeru Koumuten. The building had leaks occurring in several places, and 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 the inquiry to the completion of construction and aftercare, one representative will consistently handle your case. In the case of management associations, a resolution at the general meeting is required, so starting the process 1 to 1.5 years before the desired start date allows for a smoother progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, just presenting those is fine.
2. On-site Survey & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproof layers, and if necessary, investigate the roof, high places, and leak areas using drones or thermal imaging. For properties in Tsuzuki Ward, we will also check for rust on iron parts, the possibility of flooding on the premises, the condition of slopes and retaining walls, as well as access routes 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 using color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to district planning 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, adjustments will be made at this stage.
6. Temporary Scaffold Installation & Various Works Our in-house scaffold 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 stage and take construction photos.
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 paints used, and a warranty certificate.
8. Aftercare Maintenance We will send out annual DM notifications and inspections are possible every year. Simple repairs such as partial sealing are provided free of charge.

Resident Communication, Additional Work Approval, Inspection Reports

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

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

How Will Life Be During Construction? Impact on Residents

The principle of large-scale repairs 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 Kakeru Koumuten Co., Ltd. thoroughly explains and posts information before construction.

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

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

Have Extensive Experience in Large-Scale Repairs

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

Using Google and review sites to evaluate large-scale repair contractors can also be effective when comparing them! Be cautious if there are many negative reviews. If there are few reviews, also check their construction achievements, explanation content, and management system.

Large-scale repair work involves not only the construction itself but also the potential for troubles with residents and nearby neighbors. Therefore, it is necessary to 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, make sure to check for warranties. If any issues such as leaks occur after the construction, having a leak warranty from the contractor ensures that repairs can be made at no cost, providing peace of mind! Companies that offer warranty periods are often confident in their work, making this a key criterion for selecting a contractor.

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

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

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 three companies and compare their quotes and reports! Even for the same work, costs can vary between contractors, and warranties and aftercare services may differ as well. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, 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” in detail! If the quality of the sub-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 can be difficult to assess from appearance alone, be sure 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 jobs such as “substrate repair,” “exterior wall painting,” “waterproofing work,” and “pipe replacement,” and the plan content will change based on the actual deterioration condition and customer preferences.

If a contractor completely outsources to subcontractors, they may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or unnecessary work. If you investigate and then request a subcontractor, it may incur additional time and costs. By having knowledge and experience and managing in-house, responsible construction that keeps costs down becomes possible.

Additionally, contractors that outsource may respond slowly in the event of trouble 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).

※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 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 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 the process will follow methods similar to public works.

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

Frequently Asked Questions about Large-Scale Renovations in Tsuzuki Ward, Yokohama

How much does a large-scale renovation in Tsuzuki Ward, Yokohama cost?

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

How often should large-scale renovations be carried out?

Generally, a cycle of 12 to 15 years is recommended, and the actual cycle is most commonly 13 years according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, with about 70% falling within the 12 to 15-year range. However, the decision should be based on the condition of deterioration rather than just the number of years. If deterioration of sealing, tile lifting, or breaks in the waterproof layer are observed, 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 in the second and third renovations.

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 over 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 ensure to minimize the impact on daily life through advance notice distribution, information on the schedule and laundry on bulletin boards, and strict adherence 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, building diagnosis, contractor selection, and general meeting resolutions, followed by 3 to 6 months for construction. Overall, it is advisable to plan for around 2 years to proceed with ample time. If using subsidies or tax incentives, please also account for the time required to obtain management plan certification (2 to 3 months from application to certification).

Are there any subsidies available for large-scale renovations in Tsuzuki Ward, Yokohama?

Neither Yokohama City nor Kanagawa Prefecture provides subsidies specifically for large-scale renovation work. However, for condominium owners, if certain conditions 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 qualify for “Advanced Window Renovation 2026” or “Future 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 and starting work.

I heard that fixed property tax can be reduced with large-scale renovations. 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 renovations 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 Tsuzuki Ward Office within three months of completion. For certified management plan condominiums, there are additional requirements such as raising the repair reserve fund, so it is recommended to start preparations more than a year in advance.

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

Yes. The national “Child-Rearing Green Housing Support Project” has been abolished and reorganized into the successor “Future 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 will not be implemented in fiscal year 2026. The “Advanced Window Renovation 2026 Project” has started accepting bulk applications for apartment buildings from May 29, 2026 (application procedures are handled by registered contractors). Please be careful not to base your financial planning on outdated information.

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

There are mainly four options. ① Postpone low-urgency work after a 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 condominium common area renovation financing does not require collateral, and by obtaining management plan certification and implementing energy-saving and seismic work, the interest rate can be reduced by up to 0.6% per year. Please note that postponing waterproofing and tile peeling measures often ends up being more expensive, so please consult us for a decision on separation.

Can scaffolding be set up on buildings located on sloped or uneven terrain, such as on retaining walls or sloped land?

Yes, it can. Tsuzuki Ward is characterized by the western Tama Hills and the eastern Shimonokekitai Plateau, with a terrain of small hills and valleys. The area of Kohoku New Town has been developed more gently than the original terrain, but there are also buildings on sloped and terraced land. 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 confirming 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 the deterioration of retaining walls and slopes and consult on whether they are included in the long-term repair plan.

What happens to the parking for residents during construction?

Vehicles on the side where scaffolding will be erected will need to be temporarily moved. In buildings with group housing or on-site parking, it may take time to secure a relocation spot depending on the number and arrangement of vehicles. Kakeru Koumuten Co., Ltd. will coordinate with you about the availability of nearby coin parking and monthly parking spaces 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. In Tsuzuki Ward, there are 10 district plans and 9 building agreements, which may have stipulations regarding the color and use of the exterior. The details vary by district (there are also agreements without color stipulations). You can check what applies to your property at the Yokohama City district planning and building agreement office. Our company will also investigate this during the survey and share the completion image through color simulation, assisting in consensus building with the management association and neighbors.

Although Tsuzuki Ward is far from the sea, are there any concerns regarding damage to exterior walls and metal parts?

Since Tsuzuki Ward is an inland area not facing the sea, salt damage from sea breezes is not a major concern. However, in low-lying areas along the Tsurumi River system, where flooding is anticipated, the waterproofing around the first floor, basement, and mechanical rooms, as well as the condition of external piping and electrical equipment, are of concern. Flooding expectations vary by site, and you can check the Yokohama City flood hazard map (Tsuzuki Ward version) for details. Damage to exterior walls and metal parts can progress due to rainwater, sunlight, and age, so we will check the progression of rust on metal parts, sealing, and the condition of the waterproof layer during the on-site survey and specify the necessary scope in the estimate.

Which method should I choose, responsible construction or design supervision?

For buildings with fewer units, the burden of consulting fees tends to be heavier, so we believe that responsible construction 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 to be aware of. Even with responsible construction, verifying price, specifications, and construction status is essential. Kakeru Koumuten Co., Ltd. provides estimates that clearly state quantities, methods, and materials for each construction item, allowing you to compare on the same level with other companies.

How can I detect collusion in large-scale repairs?

There are three typical methods. ① Pre-determining the contractor and only obtaining high estimates from other companies as “dummy estimates,” ② A consultant contracting at an extremely low design supervision fee and receiving kickbacks from affiliated contractors, 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. 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 obtain estimates from?

We recommend at least three companies. Too many can make comparison difficult, while too few may not create competition. What’s important is not the number of companies but “creating the same level of comparison.” By creating a common specification sheet and quantity table and requesting under the same conditions, and requiring detailed breakdowns instead of “one set” notation, it becomes clear whether the price differences are due to differences in scope or unit prices.

What is the difference if you own your own scaffolding?

Among the costs of large-scale repair work, temporary construction accounts for about 20% (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 approximately 100 single-family homes and plans according to the site, even in areas with slopes or elevation differences.

Can I just look at the estimate while comparing quotes?

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 quotes.

Can I request just an emergency repair 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 asbestos work supervisors and building material surveyors for asbestos-containing materials. We handle everything from the legally required preliminary surveys to the cover method and removal of asbestos-containing roofing materials. If there is sprayed asbestos, you may be eligible for free surveys under Yokohama City’s countermeasure project and receive up to two-thirds (maximum 3 million yen) of the removal and construction costs as a subsidy, so we will provide this information as well.

What happens if I don’t carry out large-scale repairs?

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 probing are required under certain conditions, such as if 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 for 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.

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

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

If you are looking for a large-scale repair contractor in Tsuzuki Ward, Yokohama, contact Kakeru Koumuten

Our company handles many exterior wall renovations and large-scale repairs for condominiums and apartments in Tsuzuki Ward, Yokohama. We are happy to assist not only with large-scale repair work but also with partial repairs and leak repairs. “I want it to last long with one renovation” “I want to keep costs down as much as possible” “I want to improve insulation performance because the indoors are hot” We will propose the best solutions for your specific requests and future repair plans.

From temporary scaffolding work to roofing and exterior wall painting, all work is performed by our own team. We are confident that we will not be outdone by others in terms of cost, quality, and efficiency, so we welcome competitive quotes!

Areas Covered for Large-Scale Repair Work

Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and Tokyo.

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