[Nishi-Tokyo City, Tokyo] Renovation of Vacant Houses and Used Properties | Costs, Subsidies, and Case Studies

For those considering renovation of used properties and vacant houses in Nishitokyo

I bought a used property, but I’m not sure if the renovation estimate I received is reasonable.

This is my first full renovation, and I’m worried about making mistakes.

I want to make the most of subsidies and grants.

For such concerns, Kakeru Koumuten Co., Ltd., which has numerous achievements in Nishitokyo City, will clearly explain the key points for a successful renovation.

Get at least 3 estimates!

01Reasons for the Increase in Renovations of Used Properties and Vacant Houses in Nishitokyo City

Nishitokyo City, Tokyo, was formed by the merger of Tanashi City and Hoya City, and is a town with a residential area along the Seibu Shinjuku Line and Ikebukuro Line. It has good access to the city center and large-scale housing complexes like Hibarioka Danchi, making it popular among families.

Single-family homes and housing complexes developed during the Showa period are now entering a generation change period, reaching 40 to 50 years old. This is why the option of “buying used single-family homes or housing units and renovating (renovation) them to suit one’s lifestyle” is expanding in Nishitokyo City.

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 by purchasing and renovating used houses. Here, we explain the typical reasons for renovating vacant houses and used properties.

Reason 1 To Live Comfortably as Your Own Home

The most common reason 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 upgrading the facilities and interiors, you can create a comfortable living environment. Additionally, by changing the layout and refreshing the interior, you can finish 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 evaluated as having low asset value in their current state, but renovations can enhance their appearance and performance, increasing their value as properties.

Reason 3 To Utilize as an Investment or Business

When purchasing for investment or business purposes, renovations are essential. By transforming the property into a stylish rental or share house, you can differentiate it from other properties, and depending on the location and planning, you can expect improved profitability. Initial costs can be lower than new construction, and depending on the use and conditions, there may be opportunities for subsidies and tax incentives, leading to an increase in people 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 according to 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 confirm which parts have deteriorated and to what extent in advance. Since the property has been lived in by someone else, many internal damages are often not apparent without investigation. Conduct a current condition survey before starting work to identify 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 homes 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 performance.

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 part of the costs for earthquake retrofitting, energy-saving construction, and barrier-free renovations may be supported. Tax deductions include the “housing loan tax deduction” when using a housing loan, and there are systems where part of the costs can be deducted for certain works 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 based on the extent of damage and the scope of work. First, please familiarize yourself with the approximate costs by area to serve 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 updates to plumbing and wiring for the entire house may exceed the above estimates depending on area and method. Please confirm the exact costs through a free on-site survey and estimate.

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

05[Latest 2026] Subsidies and Grants Available in Nishitokyo City

*The following information is as of September 3, 2026. The systems change in content, duration, and budget each fiscal year, 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 application methods and applicants may differ depending on the system.

National Program: Housing Energy Saving 2026 Campaign

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

Tokyo Metropolitan Program

Nishi-Tokyo City Programs

06Customer Voices

Exterior Renovation Case Study in Nishitokyo City

07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Nishi-Tokyo City

There are many renovation companies that serve Nishi-Tokyo City, and it can be confusing to decide which one to choose. When requesting renovations, let’s check the following five points.

1. Have extensive experience in renovation work

Many renovation contractors publish their project achievements on their websites. If a contractor provides detailed explanations of the process with photos, it makes it easier to visualize the outcome after the request, providing peace of mind. If you have concerns, 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 posts. In particular, Google reviews are useful, but do not make a decision based solely on reviews; evaluate them comprehensively along with project achievements, estimates, and warranty details.

2. Check for warranties and after-sales maintenance

When choosing a contractor, be sure to check for the presence or absence of warranty. If you are within the warranty period, there may be cases where repairs are done for free. The duration varies by contractor and paint, but 1 to 10 years is typical (emergency repairs and partial repairs are often not covered by warranty). Some contractors also offer after-service separate from the warranty, so be sure to check that as well.

Kakeru Koumuten Co., Ltd. provides a warranty for all exterior renovations and sealing work. We also conduct after maintenance, sending out annual notification DM so that annual inspections are possible.
For more details about Kakeru Koumuten’s warranty and after maintenance, click here

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 construction content, warranties, after-services, and prices can vary significantly. Having multiple estimates makes price negotiations easier.

When comparing estimates, it is important to look at not only the costs but also the “items in the estimate,” “check the undercoat materials, sealing materials, and paint for ancillary parts,” and “confirm the process” in detail. Lowering the rank of ancillary parts or skipping processes can reduce costs, so it is crucial to not judge solely by price.
For more details on comparison points for estimates, click here

4. Confirm whether they perform renovations in-house

Kakeru Koumuten Co., Ltd. carefully hears and investigates the existing “condition,” “location,” “base material,” “desired durability,” and “design” to propose the optimal plan. While there is nothing inherently wrong with a system where partner companies perform the construction, it is important to confirm whether the contracting company understands the construction content and has clear responsibility for quality control and warranty. If they perform in-house construction, it becomes easier to coordinate with the site and respond quickly in case of any trouble.

5. Check if they offer color simulation and perspective creation

Choosing colors and visualizing the finished look for both exterior and interior can be challenging. With simulations, you can reduce the risk of disappointment from “it looks different than I imagined.” Since it’s difficult to redo once the work is done, it is recommended to choose a company that can provide flexible simulations.

08Reasons Why Kakeru Koumuten is Chosen for Renovations of Used Houses in Nishitokyo City

One reason is that “Kakeru Koumuten also serves Nishitokyo City,” but
“Our unique approach to renovating vacant and used properties that cannot be imitated by other companies”
has received high praise from many customers.

1. Equipment Specialized for In-House Renovations

Kakeru Koumuten has organized warehouses and material storage areas to provide high-quality renovations at low cost. We have established 5 bases centered around Aoba-ku, Yokohama for material storage and showrooms.

In-House Scaffolding Materials

For exterior renovations, temporary scaffolding is essential, and we can perform the work using our own scaffolding materials and in-house scaffolding team. By not outsourcing, this leads to cost reductions in scaffolding work. We own scaffolding materials for approximately 50 single-family homes.

Materials stored in our large in-house warehouse

We store roofing materials and paints. By placing bulk 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 that can handle different types of construction, such as compressors and cleaning machines.

In-house waste separation

In exterior renovations, various waste materials such as paint, wood, and metal are generated. While many contractors dispose of them all together, we separate and recycle waste materials, significantly reducing waste disposal costs.

Exterior renovation dedicated showroom

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

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. Since one representative handles everything from the estimate to project completion, there is no change in personnel for sales and construction management, allowing for smooth communication. From temporary scaffolding setup to exterior wall painting and roof renovations, all work is carried out by our own skilled craftsmen. We are confident in our plans and costs, so we welcome competitive estimates.

3. Various Permits and Skilled Workers

We have obtained construction industry licenses as well as permits for industrial waste collection and transportation. We also have nationally certified sheet metal 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 as well.

4. Warranty and Aftercare

Exterior painting and joint sealing work come with a warranty. Aftercare is available every year, and we send out notification DMs annually. If you are concerned about the warranty, please click on the image above for confirmation.

5. Flexible and Prompt Response

We are equipped to handle various exterior troubles and situations. Even if you cannot access the roof at high places, we can respond with a drone. For leak investigations, we also use a thermal imaging camera. We respond according to our customers’ wishes and also accept emergency measures for sudden leaks from the exterior walls only.

6. Human Resource Development

We create various models to improve skills and conduct practical training. Since exterior renovations differ in construction methods and materials based on existing materials and shapes, we regularly conduct skill enhancement training to ensure each staff member can handle various sites.
Click here for company information

7. Flexible Simulations for Both Exterior and Interior!

Kakeru Koumuten is dedicated to helping you choose colors and designs for your important building renovations, both exterior and interior, to ensure your satisfaction.

7-1. Exterior Renovation Simulation

We can create 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 propose several patterns with our recommended color schemes. We also accommodate “test painting” and “arranging paint boards” to confirm actual color tones.

7-2. Interior Renovation Simulation

We also support simulations and perspective drawings for interior renovations. Based on your preferred image, such as a modern style, we will propose 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 abundant subsidies, in line with renovations of used properties. Kakeru Koumuten Co., Ltd. also handles solar power system installations and will propose solar panels tailored to the shape of your roof. We can also accept requests for estimates and power generation simulations only.

09Renovation of Used Properties and Vacant Houses in Nishitokyo City | Frequently Asked Questions

We will answer the most frequently asked questions from those considering renovations of used properties and vacant houses in Nishitokyo City.

See Kakeru Koumuten’s construction examples
See construction menu and price list

10Features of Nishitokyo City

Nishitokyo City, Tokyo, was formed by the merger of Tanashi City and Hoya City, and is a residential area of detached houses along the Seibu Shinjuku Line and Ikebukuro Line. It has good access to the city center, and large housing complexes like Hibari-ga-oka are popular among families.

Detached houses and complexes developed during the Showa era are now reaching a generational transition, and the choice of buying used properties and renovating them is becoming established. Kakeru Koumuten is headquartered in Aoba-ku, Yokohama, and we undertake exterior and interior renovations across a wide area of Kanagawa and Tokyo. From temporary scaffolding to roof and exterior wall overlay methods, we can perform all work consistently in-house.

Renovation Service Areas

Kakeru Koumuten accepts requests from a wide area in Kanagawa and Tokyo.

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