[Konan-ku, Yokohama] Renovation of Used Properties and Vacant Houses | Costs, Subsidies, and Case Studies

Welcome to Kakeru Koumuten Co., Ltd.

We specialize in roofing, rain gutters, and exterior painting services. Our experienced team is dedicated to providing high-quality workmanship and customer satisfaction.

Whether you need a roof overlay (cover method) or new rain gutters installed, we are here to help. Contact us today for a free estimate!

Our services include:

• Roofing Solutions
• Rain Gutter Installation
• Exterior Painting

For inquiries, please call us at 0123-456-789.

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Subsidy Information

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01Reasons for the Increase in Renovations of Used Properties and Vacant Houses in Konan Ward

Konan Ward in Yokohama City is a prominent bedroom community, centered around Kamiooka and Konandai, with single-family homes and large-scale housing complexes spreading across hilly terrain. It has excellent access to the city center and Yokohama via the Keikyu Line, Yokohama City Subway, and JR Negishi Line.

Large-scale housing complexes and single-family homes developed during the Showa era, such as Hino and Nobi housing complexes, are now entering a generational transition period, with ages ranging from 40 to 55 years. This is why the option of “buying a used single-family home or housing complex and renovating it to fit one’s lifestyle” is expanding in Konan Ward.

02Reasons for Renovating Vacant Houses and Used Properties

In recent years, the Japanese housing market has expanded options not only for new constructions but also for renovating used properties. There is a growing interest in living in renovated used houses. Here, we explain the typical reasons for renovating vacant houses and used properties.

Reason 1 To Live Comfortably as Your Own Home

One of the main reasons for purchasing and renovating a used property is “to live comfortably.” Older houses often have issues with the roof, exterior walls, and plumbing, making them difficult to live in as they are. By renovating and updating the facilities and interior, you can create a comfortable living environment. Additionally, with changes to the layout and refreshing the interior, depending on the renovation work, you can achieve a home that suits your family’s lifestyle while keeping costs lower than new construction.

Reason 2 To Increase Asset Value for Sale

More people are purchasing and renovating used properties with the intention of selling them. Used houses are often valued low as they are, but renovations can enhance their appearance and performance, increasing their value as properties.

Reason 3 To Utilize as Investment or Business

For purchases made for investment or business purposes, renovations are essential. By transforming properties into stylish rentals or share houses, you can differentiate them from other properties, and depending on the location and planning, you can also expect improved profitability. Initial costs can be lower than new constructions, and depending on the use and conditions, there may also be subsidies or tax incentives available, leading to an increase in those utilizing vacant houses for business.

03Points to Consider When Renovating Vacant Houses and Used Properties

Point 1 Choose a Reliable Construction Company

First and foremost, it is essential to select a contractor you can trust to handle the renovation. Since used properties have had previous occupants, the internal structure and condition are often not clear until you actually see them. Choose a contractor who can carry out the work thoroughly in accordance with your wishes, the structure of the house, and the surrounding environment, and who also provides aftercare following the construction.

Point 2 Always Check the Deterioration of the Building

For used properties and vacant houses, it is crucial to check which parts have deteriorated and to what extent in advance. Since other people have lived there before, internal damage is often not apparent without investigation. Conduct a current condition survey before starting work to understand any hidden deterioration.

Point 3 Review Earthquake Resistance and Insulation Performance

Particularly important in the renovation of used and vacant houses is the review of earthquake resistance and insulation. The earthquake resistance standards were significantly revised in 1981, and houses built before that may not meet current standards. Furthermore, in 2000, regulations regarding joints and foundations were strengthened, making older buildings more likely to lack earthquake resistance. Check the condition of the building before starting work and be sure to check earthquake resistance and insulation.

Point 4 Check Subsidy Programs and Renovation Tax Deductions

To keep construction costs down, it is important to check for subsidies and renovation tax deductions. Subsidies are provided by the national and local governments and can support part of the costs for earthquake retrofitting, energy-saving construction, and barrier-free renovations. Tax deductions include the “housing loan tax deduction” when using a housing loan, as well as systems that allow for deductions on certain costs even with personal funds. These can sometimes be used in combination, so it is essential to check in advance and plan to utilize them strategically for a successful renovation (for the latest information, see this subsidy section).

04Cost Estimates for Renovating Vacant Houses and Used Properties

The renovation costs for used properties and vacant houses vary significantly depending on the extent of damage and the scope of work. First, please understand the approximate costs by area as a guideline for your financial planning (the table below provides general estimates for single-family homes. The interior is based on a room of about 6 tatami mats, and the exterior is based on the indicated scope of work. Actual estimates will be provided after a site survey).

1. Roof and Exterior Walls

2. Interior (Interior Finishing)

3. Water-related Equipment

4. Equipment & Infrastructure

5. Waterproofing & Earthquake Resistance

6. Exterior Works

*The above are general estimates. Costs may vary depending on the presence of scaffolding, the condition, grade, and area of the building. Waterproofing for rooftops and updating plumbing and wiring for the entire house may exceed the above estimates depending on the area and method. Please confirm the exact costs through a free on-site survey and estimate.

For more details, please see our construction menu and price list!

05[Latest 2026] Subsidies and Grants Available in Konan Ward

*The following information is as of September 3, 2026. The details, duration, and budget of the systems change annually, and many will end once the budget limit is reached. Please check with our company or the respective offices for the latest information before applying. Kakeru Koumuten can assist with confirming the systems and providing necessary documents, but the applicants and application methods vary by system.

National Program: Housing Energy Saving 2026 Campaign

The government is implementing multiple subsidy projects targeting energy-saving renovations under the “Housing Energy Saving 2026 Campaign.” Construction for insulation, windows, and water heaters may be eligible for these subsidies.

Yokohama City Programs

See also about renovation tax reductions and other systems

• Housing Loan Tax Reduction: If you use a housing loan for renovations that meet certain requirements, income tax and other deductions will be applied based on the year-end balance.
• Renovation Promotion Tax System (Investment-type Tax Reduction): For construction such as seismic, energy-saving, barrier-free, and long-term excellent housing, there may be cases where income tax deductions can be received even with personal funds.
• Reduction of Fixed Asset Tax: There is a system that reduces fixed asset tax for a certain period due to seismic renovations, energy-saving renovations, barrier-free renovations, etc.
• Kanagawa Prefecture Existing Housing Energy-saving Renovation Subsidy: For the fiscal year 2026, the subsidy rate is 1/3 with a maximum of 150,000 yen. The first phase has ended, but additional applications are scheduled from September 7 to September 30, 2026, only via electronic application and on a first-come, first-served basis (about 25 cases). Applications must be made by the applicant themselves, and construction before the grant decision is not eligible. Please check the official page of Kanagawa Prefecture.

While subsidies and tax reductions can sometimes be combined, there are restrictions on duplication for the same construction. Kakeru Koumuten will organize and propose which systems can be used for your construction after conducting a site survey.

06Customer Feedback

Roof Overlay Construction Case in Konan-ku

07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Konan Ward

There are many renovation companies that cater to Konan Ward, and it can be confusing to decide which one to choose. When requesting renovations, make sure to check the following five points.

1. Extensive Experience in Renovation Work

Many renovation contractors publish their construction achievements on their websites. If a contractor provides detailed explanations of the process with photos, it makes it easier to envision the outcome after the request, providing peace of mind. If you’re unsure, choose a contractor with extensive experience.

Google and review sites can also be helpful. It is important to check the content of low ratings, the company’s responses, and the timing of the posts. In particular, Google reviews can be informative, but do not decide solely based on reviews; make a comprehensive judgment considering construction achievements, estimates, and warranty details.

2. Check for Warranties and After-Sales Maintenance

When choosing a contractor, be sure to check for warranties. If repairs are needed within the warranty period, they may be done for free. The duration varies depending on the contractor, the type of work, and the materials used, but it is often set between 1 to 10 years (emergency repairs and partial repairs are often not covered by the warranty). Some contractors also offer after-sales services separate from warranties, so be sure to check that as well.

Kakeru Koumuten Co., Ltd. provides a guarantee for exterior renovations and sealing work. We also conduct aftercare maintenance and send out annual notification DM to ensure annual inspections are possible.
Click here for more details on Kakeru Koumuten’s guarantees and aftercare maintenance

3. Obtain estimates from multiple contractors (at least 3 companies)

When requesting renovations, be sure to obtain estimates from multiple contractors. Even for the same scope of work, warranties, after-service, and costs can vary significantly. Having multiple estimates makes price negotiations easier.

When comparing estimates, it’s important to look at not just the costs, but also the “items in the estimate,” “check the undercoating materials, sealing materials, and paint for ancillary parts,” and “confirm the process” in detail. Lowering the rank of ancillary parts or skipping steps can reduce costs, so it’s essential to not judge solely by price.
Learn more about points to compare estimates

4. Confirm whether the company performs renovations in-house

At Kakeru Koumuten, we conduct detailed hearings and investigations regarding the existing “condition,” “location,” “base materials,” “desired durability,” and “design” to propose the optimal plan. While there is nothing inherently wrong with a system where partner companies perform the work, it is important to confirm whether the contracting company understands the scope of work and has clear responsibilities for quality control and guarantees. If the work is done in-house, it is easier to coordinate with the site, allowing for quicker responses in case of any issues.

5. Check if they offer color simulations and perspective drawings

Choosing colors and envisioning the outcome after construction can be challenging for both exterior and interior work. Having simulations can reduce the risk of mistakes like “it turned out differently than I imagined.” Since it is difficult to redo once the work is done, it is advisable to choose a company that can flexibly accommodate simulations.

08Reasons why Kakeru Koumuten is chosen for renovations of used houses in Konan-ku

One reason is that Kakeru Koumuten Co., Ltd. serves Konan-ku, but
our unique approach to vacant house and used property renovations that cannot be imitated by other companies
has received high praise from many customers.

1. Equipment Specialized for In-House Renovations

At Kakeru Koumuten, we have organized warehouses and material storage areas to provide high-quality renovations at low cost. We have 5 bases within Yokohama for material storage and showrooms.

In-House Scaffolding Materials

We can construct the temporary scaffolding necessary for exterior renovations using our in-house scaffolding materials and team. By not outsourcing, we achieve cost savings on scaffolding work. We own scaffolding materials for approximately 50 detached houses.

Storage of Materials in Our Large In-House Warehouse

We store roofing materials and paints. By placing large orders at once, we can procure materials at lower prices, and since we always have stock available, we can respond quickly in emergencies. We are also equipped with various tools to handle different types of construction, such as compressors and cleaning machines.

In-house Waste Separation

In exterior renovations, various types of waste such as paint, wood, and metal are generated. While many contractors dispose of them all together, our company separates and recycles waste, significantly reducing waste disposal costs.

Exterior Renovation Dedicated Showroom

In the showroom, you can not only have meetings but also check the actual paint colors and a wide range of catalogs. You can also confirm heat insulation properties using color simulation and heat insulation paint testing equipment. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama. It is easily accessible from within Yokohama.

2. Complete In-house Construction

A major strength of Kakeru Koumuten Co., Ltd. is our complete in-house construction. By maintaining a consistent system from inquiry to project completion, we can keep costs down while providing high-quality renovations. A single representative handles everything from the estimate to project completion, ensuring smooth communication without changes in sales or construction management. All work, from temporary scaffolding installation to exterior painting and roof renovations, is carried out by our own skilled craftsmen. We are confident in our plans and costs, so we welcome competitive estimates.

3. Obtaining Various Permits and Skilled Workers

We have obtained permits for the construction industry and for the collection and transportation of industrial waste. We also have nationally certified sheet metal workers and painting specialists on staff, ensuring confidence in our construction techniques. We are capable of handling large-scale painting projects for factories and apartment complexes.

4. Warranty and Aftercare

Exterior painting and joint sealing work come with a warranty. Aftercare is available annually, and we send out notification DM each year. If you have concerns about the warranty, please click the image above for more information.

5. Flexible and Prompt Response

We are equipped to handle various exterior troubles and situations. If you cannot access the roof due to height, we can respond with a drone. We also use a thermal imaging camera for leak investigations. We respond according to customer requests and also accept emergency measures for sudden leaks from exterior walls.

6. Human Resource Development

We create various models to enhance skills and conduct practical training. Since the construction methods and materials used for exterior renovations vary depending on the existing materials and shapes, we regularly implement technical improvement education to ensure that each staff member can respond to various sites.
Click here for company information

7. Flexible simulations for both exterior and interior renovations!

Kakeru Koumuten Co., Ltd. is dedicated to helping our customers choose colors and designs for their important building renovations, ensuring their satisfaction with both exterior and interior work.

7-1. Exterior Renovation Simulation

We can provide color simulations for exterior wall painting, as well as simulations for metal siding and roof overlays. We can create simulations from actual photos of your building and suggest several color patterns based on our recommended color schemes. We also accommodate “test painting” and “sample board arrangements” to confirm actual color tones.

7-2. Interior Renovation Simulation

We also support simulations and perspective drawings for interior renovations. Based on your preferred style, such as modern, we can suggest recommended simulations. We create realistic perspectives from actual floor plans.

8. Solar Panel and Storage Battery Installation Work Available!

More customers are introducing solar power systems, which have generous subsidies, in conjunction with renovations of used properties. Kakeru Koumuten Co., Ltd. also handles solar power system installations and proposes solar panels tailored to the shape of your roof. We can also accept requests for estimates and power generation simulations only.

空き家を放置すると、劣化や損傷が進行し、最終的には修繕費用が高額になるリスクがあります。また、周囲の環境にも影響を与え、治安の悪化や資産価値の低下を招く可能性があります。定期的な点検やメンテナンスを行うことで、これらのリスクを軽減できますので、ぜひご相談ください。