Large-Scale Renovation in Aoba-ku, Yokohama | For Repairs and Renovations of Condominiums and Apartments, Contact Kakeru Koumuten Co., Ltd.

Roofing Services

At Kakeru Koumuten Co., Ltd., we specialize in a variety of roofing solutions to meet your needs. Whether you require a new roof installation or repairs, our experienced team is here to help.

Roof Overlay (Cover Method)

Our roof overlay method is designed to provide a durable and cost-effective solution for your roofing needs. This technique allows us to install a new roof over your existing one, saving you time and money.

Rain Gutter Installation

Proper rain gutter installation is crucial for protecting your home from water damage. We offer high-quality rain gutters that are tailored to fit your home perfectly.

Exterior Painting

Enhance the beauty of your home with our professional exterior painting services. We use top-quality paints that are designed to withstand the elements and keep your home looking great for years to come.

Contact Us

If you have any questions or would like to schedule a consultation, please contact us at 123-456-7890. We look forward to working with you!

Large-Scale Renovations for Condominiums, Apartments, and Buildings in Aoba-ku, Yokohama

Large-scale repair work that can be handled in Aoba-ku, Yokohama

Large-scale repairs are not just “exterior painting” or “waterproofing,” but rather a comprehensive repair 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.

Building Conditions and Repair Points in Aoba-ku, Yokohama

Aoba-ku, Yokohama, is a residential area that was systematically developed as part of the Tama Den-en-toshi area, triggered by the opening of the Tokyu Den-en-toshi Line between Mizonokuchi and Nagatsuta in 1966. About 90% of the residential areas in the ward have been urbanized through planned developments such as land readjustment, which results in the characteristic that “collective housing built around the same time reaches the repair period at the same time.”

Source: Aoba-ku, Yokohama “Naruhodo Aoba”／Yokohama City “Data on Greenery” (FY2019)／Aoba-ku, Yokohama Plan／Yokohama City Housing Policy Council Condominium Subcommittee Materials

Condominiums in Aoba-ku are divided into “three generations”

The history of development in Aoba-ku is reflected in the layers of building age. Depending on which layer your building falls into, the extent of major repairs required in the next round will vary.

Four Unique Factors That Damage Buildings in Aoba-ku

It is sometimes explained that “measures against salt damage are necessary because it’s Yokohama,” but inland Aoba-ku has other factors that affect buildings before salt damage. While investigating buildings in Aoba-ku, I repeatedly encounter the following four factors.

Source: Yokohama City “Data on Greenery” / Yokohama City “Large-Scale Earthworks” / Japan Meteorological Agency Average Values (1991-2020) / Yokohama City “District Plans”・“Building Agreements (Aoba-ku)”

Key Points to Consider When Advancing Construction in Aoba-ku

*Kakeru Koumuten has a base including a showroom and material storage in Aoba-ku, allowing us to respond quickly to all areas of Aoba-ku, including Aobadai, Azamino, Tama-Plaza, Ichigao, Fujigaoka, Eda, and Tana.

Signs of Deterioration Requiring Major Repairs and Timing

Generally, major repairs are estimated to occur every 12 to 15 years. According to a survey by the Ministry of Land, Infrastructure, Transport and Tourism, the actual repair cycle averages 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 notice symptoms like those below, we recommend an early on-site inspection.

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

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”

Cost Estimates for Large-Scale Renovations in Aoba-ku, Yokohama

The cost of large-scale renovations varies significantly depending on the size of the building, its condition, the scope of work, and the materials used. First, please refer to the national average based on public statistics, then to our company’s estimates based on past projects categorized by scale, and finally to examples of unit prices for each type of work.

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

According to a survey conducted by the Ministry of Land, Infrastructure, Transport and Tourism, which compiled 818 construction cases, about 70% of the costs for large-scale renovations 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.

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 Reserve Funds”　*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.” *The total does not equal 100% because it includes other construction and survey costs.

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

*The above is an estimate based on Kakeru Koumuten’s construction performance and may vary depending on the presence of roofing work, metalwork, and plumbing. For condominiums, please also consider the amount obtained by multiplying the national statistics (750,000 – 1.5 million yen per unit) by the number of units as a reference.

Unit Price Examples 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 the next major repair will be with the lifespan of the materials to avoid waste.

*The estimated lifespan is a general guideline and may vary depending on sunlight, location, and the condition of the substrate. For surfaces in Aoba-ku, which are often shaded and humid, choosing paints with anti-algae and anti-mold properties can improve durability.

Guidelines for Repair Reserve Funds and Options When Insufficient

The Ministry of Land, Infrastructure, Transport and Tourism guidelines provide estimates for repair reserve funds on a monthly basis per unit area. Additional charges are required if there is a mechanical parking lot.

Source: Ministry of Land, Infrastructure, Transport and Tourism “Guidelines for Repair Reserve Funds for Condominiums” (Revised June 2024, PDF) / The national average is 13,378 yen per unit per month (2023 Comprehensive Survey on Condominiums)

According to the 2023 Comprehensive Survey on Condominiums, 36.6% of management associations reported that “the repair reserve fund is insufficient compared to the plan.” There are four main options when funds are insufficient.

Examples of Large-Scale Renovation Work

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

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

Customer Feedback

Flow from On-Site Survey to Completion of Construction

From the initial inquiry to the completion of the construction and aftercare, one dedicated representative will handle everything consistently. For management associations, a resolution at the general meeting is necessary, so starting the process 1 to 1.5 years before the desired start date allows for a more relaxed progression.

1. Contact Us (Free) Please reach out via phone, form, or LINE. If you have estimates from other companies, it’s fine to just present those.
2. On-Site Survey & Building Diagnosis (Free) We will conduct a survey of the exterior walls, check for cracks, sealing, and waterproofing layers, and if necessary, use drones or thermal imaging to investigate the roof, high places, and leak areas. For properties in Aoba-ku, we will also check the condition of retaining walls, slopes, trees, and the delivery route and parking.
3. Survey Report & Estimate Submission We will provide a deterioration diagnosis report with photos and an estimate detailing quantities, methods, and materials for each work item. Multiple plan proposals are also possible.
4. Plan Decision & Contract Confirm colors through color simulations, paint samples, and trial painting. For management associations, we can assist in preparing materials for general meetings. In areas subject to district planning or building agreements, we will also explain the considerations for color choices.
5. Notification to Residents & Neighbors We will distribute construction notices, visit neighbors to greet them, and install bulletin boards at the entrance (with project schedules and laundry information). If temporary relocation of parking is necessary, adjustments will be made at this stage.
6. Temporary Scaffolding Setup & Various Works Our in-house scaffolding team will set up the scaffolding, followed by high-pressure washing, substrate repair, sealing, exterior wall painting, tile repair, waterproofing, and work on iron parts and accessories in that order. A supervisor will inspect each stage and take construction photos.
7. Completion Inspection, Scaffolding Dismantling & Handover We will confirm the finish in the presence of the customer and provide construction photos, a report on the paints used, and a warranty certificate.
8. Aftercare Maintenance We will send annual DM notifications and conduct regular inspections. Simple repairs such as partial sealing will be provided free of charge.

How Will Life Be During Construction? Impact on Residents

Major repairs are generally conducted while you continue to live in your home. However, there will be some limitations on daily life while scaffolding is in place. Most troubles can be prevented by providing prior notice, so Kakeru Koumuten Co., Ltd. is committed to thorough explanations and postings before construction begins.

Reasons Kakeru Koumuten is Chosen for Large-Scale Renovations in Aoba-ku, Yokohama

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

1. Equipment Specialized for Exterior Renovations

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

In-house Scaffolding Materials

We own the scaffolding materials necessary for temporary scaffolding required for large-scale renovations and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs on scaffolding work and provide quick and flexible responses.
We have approximately enough scaffolding materials for 100 single-family homes!

Storage of Materials in Our Large In-house Warehouse

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

In-house Waste Sorting

During large-scale renovations, various waste materials such as leftover paint, metal, and wood are generated. While most contractors dispose of these materials together, we can significantly cut waste disposal costs by sorting and recycling the waste materials.

Dedicated Showroom for Exterior Renovations

In the showroom, not only can we hold meetings, but you can also check actual samples and colors of exterior materials. We also offer color simulations for exterior wall painting and the ability to test heat insulation using a heat insulation testing machine!

2. Cost Reduction through In-house Comprehensive 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 assist you from the estimate to the completion of the work. Since the担当者 does not change, communication can proceed smoothly.

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 at each stage!

3. Various Permits and Skilled Workers

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

4. Warranty and Aftercare

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

5. Flexible and Prompt Response

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

We can also address exterior walls and rooftops that cannot be checked from high places using drones! During rain 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. Human Resource Development

Our staff creates various models to enhance their skills and conducts practical training. Since different processing and techniques are required depending on the site, we regularly provide skill enhancement education to ensure that each staff member can respond appropriately. We also educate on points to pay attention to and areas to check during each phase of large-scale repair work.

7. Consideration for Residents and Neighbors

During large-scale repair work, we not only notify residents and visit neighbors to greet and explain the work, but we also set up bulletin boards at entrances to display progress charts and notices! Additionally, we ensure thorough etiquette training for visitors to minimize any inconvenience to residents and neighbors.

8. Strict Quality Control

Each phase undergoes inspection by a responsible person, along with detailed photographs of the construction. We use film thickness testers and check sheets to ensure there are no oversights during inspections. When performing exterior wall painting or waterproofing work, we confirm the quantity of used paint cans to ensure the specified amount of paint is used, and we order paint in-house to prevent construction defects. Of course, we also photograph and report the used paint.

9. Exterior Wall Painting Color Simulation

9-1 Self Color Simulation

The simulations we create can be done using photos of your actual apartment or building!Simulations can be performed on your smartphone or computer. By simulating and then applying two-tone colors or making image changes, 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.

* Aoba-ku has many areas where “colors in harmony with the surrounding landscape” are required by building agreements and district plans. Having a color simulation screen will help facilitate explanations at neighborhood associations, agreement management committees, and general meetings.

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

You can order samples of the paint you are considering and conduct test painting on your exterior wall. By doing 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 applying metal siding
・Simulation using accent materials such as cornices and louvers
・Simulation for roof painting and roof replacement work

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

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

There are many large-scale repair contractors that cover Aoba-ku, Yokohama, 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 their services.

It is also effective to use Google and review site ratings as a reference when comparing large-scale repair contractors! If there are many negative reviews or no reviews, it is safer to refrain from making a request.

Large-scale repair work involves not only the construction itself but also the potential for troubles with residents and neighboring inhabitants. Therefore, it is necessary to report the progress of the work and information about laundry on bulletin boards, etc., 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 warranties and aftercare maintenance

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 free of charge, providing peace of mind! Companies that offer warranty periods demonstrate confidence in their work, making it 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 support 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 3 companies and compare their quotes and reports! Even for the same work, costs can vary between contractors, and warranties and aftercare services may differ as well. Additionally, obtaining multiple estimates makes price negotiations easier.

When comparing estimates, consider not only the cost but also the “items in the estimate,” “methods and materials for base repairs and exterior painting,” and “confirmation of the process” in detail! Lowering costs can be achieved by using lower-grade materials or skipping steps, so avoid making decisions based solely on price. Especially since base repair work can be difficult to assess visually, make sure to verify whether the repair methods are appropriate for the condition of the base!

Check these points on the estimate (checklist)

Confirm whether it is self-managed

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 state of deterioration and customer preferences.

There are cases where contractors that completely outsource to subcontractors may lack knowledge and experience, leading to proposals for repairs in irrelevant areas or unnecessary work. Since they investigate and then request subcontractors, it incurs additional time and costs. By having knowledge and experience and managing in-house, responsible construction can be carried out at a reduced cost.

Moreover, contractors that outsource may also face delays in response if any troubles occur during construction, which is a disadvantage. It is advisable to avoid companies that manage construction without having actual discussions with the customers. Kakeru Koumuten Co., Ltd. handles everything from temporary scaffolding setup to exterior wall painting and waterproofing work in-house, with knowledgeable and experienced personnel managing the construction!

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

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

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

Latest 2026 In the large-scale renovation industry, inappropriate orders linked between design consultants and construction companies have long been a concern. The Ministry of Land, Infrastructure, Transport and Tourism issued warnings and notifications to management associations in January 2017 and April 2023, and it has been reported that in June 2026, the Japan Fair Trade Commission plans to issue exclusion orders to 38 companies, including 36 construction companies and 2 design consultants, regarding large-scale renovation work in the Kanto region (with penalties totaling approximately 1.6 billion yen).

*The above is based on reports. Please check the announcements from the Japan Fair Trade Commission for the official details of the sanctions.

Three Typical Tactics

Source: Yokohama City “What is collusion in large-scale repair work for condominiums?” / Ministry of Land, Infrastructure, Transport and Tourism “On the Appropriateness of Ordering Large-Scale Repair Work for Condominiums” (Notification dated April 3, 2023, 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 with consultants whose design management fees are unusually low
• Include a penalty clause in the contract for cases of collusion discovery
• Avoid concentrating information with a single consultant and verify specifications by the management association itself

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 be conducted in accordance with public works methods.

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

Subsidies, Tax Systems, and Loans to Confirm for Large-Scale Repairs in Aoba-ku, Yokohama

In both Yokohama City and Kanagawa Prefecture, there are no subsidies specifically for large-scale repair work. The available options can be broadly categorized into the following four types. The eligibility and application status for these programs may change during the fiscal year, so please be sure to confirm with our company or the respective offices before signing a contract or starting work. (As of August 25, 2026)

① Condominium Longevity Promotion Tax System (Property Tax Reduction)

If large-scale repairs (such as 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).

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

The support system in Yokohama City is mostly based on the premise 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 for Condominium Management Associations by Concern” / Long-term Repair Plan Creation Promotion Model Project / Condominium Advisor Dispatch / Yokohama Condominium Portal

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

This is a system certified by Yokohama City. Upon receiving certification, the loan interest rate from the Japan Housing Finance Agency is reduced by 0.2% per year, preferential interest rates for Flat 35 are available, and the route for applying the Long Lifespan Promotion Tax System is opened. The main criteria include holding general meetings at least once a year, organizing management regulations, separate accounting for management fees and repair reserves, overdue amounts within 10% of the total, and “having a long-term repair plan that includes large-scale repair work at least twice and is created or reviewed within 7 years, with a planning period of over 30 years”, among others.

* Fees include a system usage fee of 10,000 yen + city application fee of 3,900 yen, etc. 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 Excellent Housing Renovation Promotion Project” will end in Fiscal Year 7 and will not be implemented in Fiscal Year 8. Please be careful not to create financial plans based on outdated information.

Mirai Eco Housing 2026 Project

Advanced Window Renovation 2026 Project

⑤ Kanagawa Prefecture Subsidies (Fiscal 2026, Phase 2 applications accepted in September)

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

⑥ Financing System (Housing Finance Agency Condominium Sumairu Loan)

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

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

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

Frequently Asked Questions about Large-Scale Renovations in Aoba-ku, Yokohama

How much does a large-scale renovation in Aoba-ku, Yokohama cost?

For condominiums, according to the Ministry of Land, Infrastructure, Transport and Tourism’s survey, about 70% fall within the range of 750,000 to 1,500,000 yen per unit, 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 cost for a two-story wooden apartment ranges from 2,000,000 to 4,000,000 yen, for a three-story steel or RC apartment from 4,000,000 to 9,000,000 yen, and for small condominiums or mixed-use buildings from 5,000,000 to 15,000,000 yen. The cost varies depending on the condition of the underlying structure and whether waterproofing or roofing work is 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 a guideline, and the actual average cycle is 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. In Aoba-ku, where many buildings are 30 to 50 years old, there is a tendency for a greater emphasis on tile repairs and iron part replacements during 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 or buildings about 1.5 to 3 months, and for condominiums with over 50 units 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, including distributing advance notices, providing information on the schedule and laundry on bulletin boards, and strictly adhering to work 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 the construction itself. Overall, it is advisable to plan for around 2 years to proceed comfortably. If you are 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 renovations in Aoba-ku, Yokohama?

Both Yokohama City and Kanagawa Prefecture do not provide subsidies specifically for large-scale renovation work. However, for condominium owners, 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 making common areas barrier-free (one-third up to 300,000 yen). If the work includes windows and insulation, it may qualify for “Advanced Window Renovation 2026” or “Mirai Eco Housing 2026.” Applications must be made before the construction contract and commencement.

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

Yes, it is true. Under the Condominium Longevity Promotion Tax System, if a condominium that meets certain criteria (such as being over 20 years old and having more than 10 units) undergoes large-scale renovations that contribute to its longevity, the fixed property tax for the following year will 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 Aoba-ku Office within three months of completion. Since preparations such as obtaining management plan certification are necessary, it is recommended to start planning more than a year in advance.

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

Yes, there are changes. The national “Child-Rearing Green Housing Support Project” has been abolished and restructured 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 Quality 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” began accepting bulk applications for apartment buildings starting May 29, 2026. Please be careful not to base your financial plans on outdated information.

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

足場を自社で持っていると、工事の効率が向上し、コストを抑えることができます。翔工務店では、自社の足場班が直接足場を組むため、現場の状況に応じた柔軟な対応が可能です。また、外注する場合に比べて、スケジュールの調整がスムーズに行え、工事の進行が遅れるリスクを減らすことができます。さらに、足場の品質管理も自社で行うため、安全性が高く、安心して工事を進めることができます。Among the costs of large-scale repairs, temporary construction accounts for about 22.8% (according to a survey by the Ministry of Land, Infrastructure, Transport and Tourism). By not outsourcing scaffold work, we can directly control this 20% portion, allowing our in-house scaffold team to flexibly respond to sudden changes in the schedule or additional work. Kakeru Koumuten Co., Ltd. owns scaffold materials for approximately 100 single-family homes and plans accordingly even in sites with elevation differences like Aoba-ku, Yokohama.

Can I just have a look at the estimate while I’m in the process of getting multiple 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 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 asbestos supervisors and inspectors on staff, and 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 and subsidies covering two-thirds of the removal costs (up to 3 million yen) through Yokohama’s countermeasure project, so we will provide guidance on that as well.

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

There are risks such as personal injury accidents due to falling exterior wall tiles, structural deterioration from rusting rebar, leaks, and a decrease in asset value. Furthermore, buildings with tiled or mortar-finished exterior walls are required to undergo a comprehensive survey at the first inspection after 10 years from completion or exterior wall renovation, as stipulated in Article 12 of the Building Standards Act. Failure to conduct the survey and report may result in penalties. The applicable scale and use are determined by Yokohama’s specifications, so please consult us if you are unsure.

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

For a two-story wooden building with 6 to 10 units, the estimate is between 2 million and 4 million yen, and for a three-story steel or RC building with 10 to 20 units, it ranges from 4 million to 9 million yen based on our past performance (including scaffold, 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 exterior appearance through color simulations during repairs to improve occupancy rates.

If you are looking for a large-scale repair contractor in Aoba-ku, Yokohama, contact Kakeru Koumuten Co., Ltd.

Our company is based in Aoba-ku, Yokohama, and we handle many exterior wall renovations and large-scale repairs for condominiums and apartments in the area. 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 because the indoors are hot”, we will propose the best solutions for your specific requests and future repair plans.

From temporary scaffold work to roofing and exterior wall painting, we handle everything in-house. We are confident that we won’t be outdone by others in terms of cost, quality, and scheduling, so we welcome competitive estimates!

On-site surveys, estimates, and color simulations are all free of charge

Please feel free to consult us via the inquiry form, phone, or LINE.
It’s perfectly fine to just present estimates from other companies.

Request a free estimate
Consult via LINE

Areas Covered for Large-Scale Renovation Work

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

Service Areas in Aoba-ku, Yokohama
Aobadai / Akane-dai / Azamino / Azamino Minami / Ichigao-cho / Utsukushigaoka / Utsukushigaoka Nishi / Umegaka / Enkodate / Eda Kita / Eda-cho / Eda Nishi / Enokioka / Oba-cho / Onda-cho / Kakinokidai / Katsuradai / Kamitayamoto-cho / Kamoshida-cho / Tetsumachi / Kurosuda / Sakuradai / Satsukigaoka / Jike-cho / Shimotayamoto-cho / Shiratoridai / Shin-Ishikawa / Susukino / Sumiyoshidai / Tachibanadai / Tana-cho / Chigusa-dai / Tsutsuji-ga-oka / Nara / Nara-cho / Nariai-cho / Fujigaoka / Matsukaze-dai / Misuzugaoka / Mitake-dai / Midoriyama / Moegino / Moto-Ishikawa-cho / Momino-ki-dai / Wakakusa-dai

よろしければこちらもご覧ください！

・When should large-scale renovations be carried out? An explanation of the optimal timing and risks of postponement!
・Estimates are essential when conducting large-scale renovations! Key comparison points and precautions!
・5 common troubles in large-scale renovations for condominiums! Thorough explanations of causes and prevention measures!
・What is waterproofing work in large-scale renovations? A thorough explanation of its role, signs of deterioration, and precautions!
・Not enough funds for large-scale renovations… Solutions for funding shortages and preparations you can do right now!
・What is surface repair, which is crucial in large-scale renovations? A thorough explanation of its necessity, signs of deterioration, and types of work!
・What is sealing work in large-scale renovations? An introduction to its role, methods, and tips for avoiding failures!
・What is tile repair, which is important in large-scale renovations? An explanation of signs of deterioration, types of work, and cost averages!
・What is exterior wall painting, which is crucial in large-scale renovations? A thorough explanation of its necessity, signs of deterioration, and cost averages!
・For exterior renovations in Aoba-ku, Yokohama, trust Kakeru Koumuten Co., Ltd.!
・For roof renovations in Aoba-ku, Yokohama, trust Kakeru Koumuten Co., Ltd.!
・Leave your exterior wall painting in Aoba-ku, Yokohama to Kakeru Koumuten Co., Ltd.!

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