[Kokubunji City, Tokyo] Vacant & Used Homes: Renovation Costs, Grants & Projects
For those considering renovations of used properties and vacant houses in Kokubunji City
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 these concerns, Kakeru Koumuten Co., Ltd., which has numerous achievements in Kokubunji 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 Kokubunji City
Kokubunji City in Tokyo is known for its historical and natural beauty, featuring the Kokubunji Cliff Line (Hake) greenery and spring water, and the O-taka Path. It has a calm residential area that is popular for its livability.
Single-family homes developed during the Showa era are now entering a generation change period, reaching 40 to 50 years old. This is why the option of “buying a used single-family home and renovating (renovation) it to suit your lifestyle” is expanding in Kokubunji City.
Good Living Environment with Hake and Spring Water
A historic residential area close to the greenery and spring water of the Kokubunji Cliff Line. The movement to live on through used + renovation is active.
City Subsidies for High-Insulation Windows
Kokubunji City’s renewable energy and energy-saving subsidies cover high-insulation windows (1/8, up to 80,000 yen) and solar power. They are helpful for energy-saving in used homes.
Cliff Line Topography and Retaining Walls
There are locations along the slope with elevation differences and spring water, requiring consideration for retaining walls and drainage.
Subsidized Renovation Funds with No Interest
The city’s renovation financing assistance covers the entire interest cost. This is helpful for planning substantial renovation funds.
In this article, we summarize the reasons, precautions, cost estimates, the latest subsidies for 2026, and how to choose contractors from the perspective of Kakeru Koumuten, which also serves Kokubunji City, to help those considering renovating used properties and vacant houses in Kokubunji City “avoid mistakes.”
The Most Important Thing is “Comparative Estimates”
The most crucial factor in avoiding mistakes in renovations is comparative estimates. First, obtain estimates from at least three companies that serve the Kokubunji City area. Our company, Kakeru Koumuten Co., Ltd., also receives many consultations and requests for renovations of vacant houses and used properties.
02Reasons for Renovating Vacant Houses and Used Properties
In recent years, the Japanese housing market has expanded options not only for new builds but also for renovating used properties. There is growing interest in living in renovated or refurbished used homes. 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 homes often have issues with the roof, exterior walls, and plumbing, making them difficult to live in as they are. By renovating and improving the facilities and interior, 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 goal of selling them. Used homes 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 into stylish rentals or share houses, you can differentiate 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 also be subsidies or tax incentives, leading to an increase in those utilizing vacant houses for business.
03Precautions 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 your renovation with peace of mind. For used properties, since there were 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 your home, 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 are deteriorating and to what extent in advance. Since previous occupants lived there, internal damage is often not apparent without investigation. Be sure to understand any hidden deterioration through a current condition survey before starting construction.
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 construction 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 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 that allow for partial deductions of costs 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 as a key to successful renovation (for the latest information, see this subsidy section).
04 Cost 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 market rates 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
| Construction Content | Estimated Cost |
|---|---|
| Roof Repair and Painting | Approximately 200,000 to 800,000 yen |
| Roof Replacement and Roof Overlay Method | Approximately 700,000 to 2,500,000 yen |
| Exterior Wall Painting | Approximately 600,000 to 1,500,000 yen |
| Exterior Wall Replacement and Overlay Method | Approximately 1,500,000 to 3,000,000 yen |
2. Interior (Interior Finishing)
| Construction Content | Estimated Cost |
|---|---|
| Floor Replacement (Approximately 6 tatami mats, flooring, etc.) | Approximately 100,000 to 300,000 yen |
| Wallpaper Replacement (Approximately 6 tatami mats) | Approximately 50,000 to 150,000 yen |
| Ceiling Repair and Painting (Approximately 6 tatami mats) | Approximately 30,000 to 100,000 yen |
| Renovation from Japanese-style Room to Western-style Room (1 room) | Approximately 200,000 to 600,000 yen |
3. Water-related Equipment
| Construction Content | Estimated Cost |
|---|---|
| Kitchen Replacement | Approximately 450,000 to 1,500,000 yen |
| Bathroom Renovation (Unit Bath) | Approximately 600,000 to 1,500,000 yen |
| Toilet Replacement | Approximately 120,000 to 500,000 yen |
| Vanity Replacement | Approximately 80,000 to 300,000 yen |
4. Equipment and Infrastructure
| Construction Content | Estimated Cost |
|---|---|
| Water Heater Replacement | Approximately 100,000 to 500,000 yen |
| Pipe Replacement (Aging Water Pipes, etc., Partial Work) | Approximately 100,000 to 500,000 yen |
| Electrical Wiring Work (Partial Work) | Approximately 100,000 to 500,000 yen |
| Insulation Renovation (Replacing Multiple Windows, Installing Inner Windows, etc.) | Approximately 200,000 to 1,000,000 yen |
5. Waterproofing and Earthquake Resistance
| Construction Content | Estimated Cost |
|---|---|
| Balcony Waterproofing Work | Approximately 100,000 to 400,000 yen |
| Seismic Reinforcement Work | Approximately 500,000 to 2,000,000 yen |
6. Exterior Works
| Construction Content | Estimated Cost |
|---|---|
| Entrance Door Replacement | Approximately 200,000 to 500,000 yen |
| Gate and Fence Renovation | Approximately 200,000 to 800,000 yen |
| Parking Lot Maintenance (for 1 car, including concrete pouring, etc.) | Approximately 200,000 to 600,000 yen |
*The above are general estimates. Costs may vary depending on the presence of scaffolding, the condition, grade, and area of the building. Waterproofing of 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.
Please check the construction menu and price list for more details!
05[Latest 2026] Subsidies and Grants Available in Kokubunji City
One way to renovate used properties and vacant houses cost-effectively is to utilize subsidy and grant systems. As of 2026, we have summarized the main systems that residents of Kokubunji City may be able to use.
*The following information is as of September 2, 2026. The content, duration, and budget of the systems change annually, and many will end once the budget limit is reached. Be sure to check the latest information at the official contact points for each system before contracting or starting work. Kakeru Koumuten can assist with confirming systems and providing necessary documents, but the application process and applicants may 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.
This program succeeds the “Child-Rearing Green Housing Support Project.” Renovations must meet the requirements for each category, including essential work that involves insulation renovation of the structure (floor, walls, ceiling). Eco-friendly housing equipment, child-rearing compatible renovations, disaster prevention improvements, and barrier-free renovations may also be eligible.
The subsidy limits, eligible construction, and application deadlines vary based on the age of the house, performance category, and construction details. Applications must be submitted by registered contractors. For more details, please check the official page.
This program covers window insulation renovations such as installing interior windows, replacing exterior windows, and glass replacement. The subsidy amount is substantial and effective for countering cold, heat, and condensation. It can easily enhance the insulation performance of existing homes.
The subsidy amount varies based on the window construction method, performance, size, and the type of house. If the total subsidy amount for one application is less than 50,000 yen, it is not eligible. Applications are accepted starting March 31, 2026, and grant applications must be submitted by December 31 at the latest (may end early if the budget limit is reached). Applications must be submitted by registered contractors.
This program targets the replacement of high-efficiency water heaters such as EcoCute, hybrid water heaters, and EneFarm. It is a suitable program for used properties planning to replace water heaters.
Estimated subsidy amounts: EcoCute 70,000 to 100,000 yen per unit, hybrid water heaters 100,000 to 120,000 yen per unit, EneFarm 170,000 yen per unit. Eligible construction must start after November 28, 2025, and applications are accepted starting March 31, 2026 (may end early if the budget limit is reached).
Tokyo Metropolitan Program
This program covers high insulation windows (installation of interior windows, replacement of exterior windows, glass replacement), high insulation doors, insulation materials, and high insulation bathtubs. It is a program with substantial subsidies that can significantly enhance the insulation performance of existing homes.
High thermal insulation windows and doors have a maximum subsidy of 2 million yen per unit (3 million yen per unit for security windows), insulation materials are covered at one-third of eligible expenses with a maximum of 1 million yen, and high thermal insulation bathtubs are 95,000 yen per unit. Pre-registration starts on May 29, 2026, and application submissions are accepted from June 30, 2026. Individuals and corporations owning residences in Tokyo are eligible. The program is operated by Cool Net Tokyo. For more details, visit the official page.
A system that provides points for replacing with energy-efficient air conditioners, refrigerators, water heaters, and LED lighting. It works well for updating equipment when moving into a used property.
Estimated points: 9,000 to 23,000 yen for air conditioners, 14,000 to 26,000 yen for refrigerators, 12,000 points for water heaters (such as eco-cute), and 4,000 yen for LEDs, etc. Replacements are valid until March 31, 2027. Individuals with an address in Tokyo are eligible. For more details, visit the official page.
This program supports the installation of eligible storage batteries in residential properties in Tokyo. There are requirements for each application category, including coordination with solar power generation equipment and demand response.
The basic subsidy amount is calculated by comparing eligible expenses with “storage capacity × 100,000 yen,” and there are additional amounts based on conditions. Some requirements will change for applications submitted after October 1, 2026, so please check the official page for FY2026 before signing a contract.
Kokubunji City Program
Support for earthquake resistance in Kokubunji City, known for its greenery and spring water along the Kokubunji Fault (Hake). Free dispatch of earthquake diagnosis specialists is also available.
Seismic retrofitting covers 8/10 of the construction cost (including tax) up to 1,000,000 yen, with 1/3 for demolition up to 700,000 yen, and 8/10 for demolition associated with rebuilding up to 700,000 yen. The target is certain wooden houses that started construction before May 2000 (for demolition, before May 1981). You need to undergo a seismic diagnosis by the city and sign a contract after the grant decision, and for seismic retrofitting, construction supervision by a registered seismic diagnostician is required. Applications are accepted until January 29, 2027. For more details, visit the official page of Kokubunji City.
This is a unique city program that can be used for high insulation windows, solar power, storage batteries, Ene-Farm, and more.
Solar power 30,000 yen/kW up to 150,000 yen, Ene-Farm 60,000 yen, storage batteries 60,000 yen, and high insulation windows cover 1/8 of the installation cost up to 80,000 yen. The first phase has ended as the budget has been reached, and the second phase is scheduled from December 1, 2026, to March 31, 2027 (may end early if the budget is reached). Please check the official page for conditions such as eligibility and installation timing. For more details, visit the official page of Kokubunji City.
The city facilitates renovation funds for expansion, remodeling, and repairs with a full interest subsidy, making it effectively interest-free.
Housing renovation fund loan facilitation: 3,000,000 to 4,000,000 yen for expansion and remodeling (up to 80% of construction costs), with the city covering all interest = zero burden for the applicant. Long-term care insurance for home modifications is 200,000 yen, and for block wall removal (removal 6,000 yen/m, installation 4,000 yen/m) as well. There are no specific requirements for local contractors in the loan facilitation.
*Kokubunji City’s seismic retrofitting subsidy has conditions such as prohibition of contracts before the city’s seismic diagnosis and grant decision, and construction supervision by a registered seismic diagnostician. For renewable energy and energy-saving equipment subsidies, housing renovation fund loan facilitation, block wall removal, and national and Tokyo Metropolitan government programs, please confirm eligibility and combined conditions before signing contracts or starting construction.
See also about renovation tax deductions and other programs
- Housing Loan Tax Reduction: If you use a housing loan for renovations that meet certain requirements, income tax deductions will be applied based on the year-end balance.
- Renovation Promotion Tax System (Investment-type Tax Reduction): For construction projects such as earthquake resistance, energy conservation, barrier-free design, and long-term excellent housing, you may be eligible for income tax deductions even with your own funds.
- Reduction of Property Tax: There is a system that reduces property tax for a certain period for earthquake-resistant renovations, energy-saving renovations, and barrier-free renovations.
- Tokyo’s Insulation and Energy Conservation Subsidy: The above “Tokyo’s System” (energy-saving renovation promotion project for existing homes, Tokyo Zero Emission Points, etc.) can sometimes be combined with the national “Housing Energy Conservation 2026 Campaign.” If you are considering work on windows, insulation, or high-efficiency equipment, please consult us before starting the project.
Subsidies and tax reductions can sometimes be combined, but there are restrictions on duplication for the same construction work. Kakeru Koumuten will organize and propose “which system can be used for your construction” after conducting a site survey.
06Customer Voices
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Exterior Renovation Case Study in Kokubunji City
| Construction Location | Kokubunji City, Tokyo |
|---|---|
| Construction Details | Roof Overlay Work |
| Existing Roofing Material | Slate |
| New Materials Used | Asahi Fiberglass / Ridgeway |
| Price Range | 600,000 yen – 700,000 yen |
| Completion Month | September 2023 |
Our Proposal
We propose the roof overlay (cover method) that allows for new roofing materials to be placed over the existing slate without removal, along with the cost-effective Ridgway from Asahi Fiberglass. After assessing the condition of the existing roof, we select a construction method that minimizes the removal area and waste materials.
07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Kokubunji City
There are many renovation companies that serve Kokubunji City, and it can be confusing to decide which one to choose. When requesting renovations, be sure to check the following five points.
- Experience in renovation work
- Check for warranties and aftercare services
- Obtain estimates from multiple contractors (at least 3 companies)
- Confirm whether they conduct renovations in-house
- Check if they offer color simulations and perspective drawings
1. Experience in Renovation Work
Many renovation contractors publish their work 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 ample 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. While Google reviews are particularly useful, do not make your decision based solely on reviews; consider the overall picture including work achievements, estimates, and warranty details.
2. Check for Warranties and Aftercare Services
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 by contractor and paint type, but typically ranges from 1 to 10 years (emergency repairs and partial repairs are often not covered). Some contractors also offer aftercare services in addition to warranties, so be sure to check for those as well.
Kakeru Koumuten Co., Ltd. provides a warranty for all exterior renovations and sealing work. We also conduct aftercare maintenance and send out annual notification DM, allowing for annual inspections.
Click here for more details on Kakeru Koumuten’s warranty 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-sales service, and prices can vary significantly. Having multiple estimates makes price negotiations easier.
When comparing estimates, it is important to look at not just 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 steps can reduce costs, so it is 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 clearly defines the responsibilities for quality control and warranty. 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 visualizing the image 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 provide flexible simulations.
08Reasons why Kakeru Koumuten is chosen for renovations of used houses in Kokubunji City
One reason is that Kakeru Koumuten Co., Ltd. serves Kokubunji City,
and our unique approach to “renovating vacant houses and used properties”
has received high praise from many customers.
We have absolute confidence in “cost,” “quality,” and “plans” for renovations in Kokubunji City. Please compare our estimates with those of other companies.
The most important aspect of renovations is getting multiple estimates. Be sure to request estimates from at least three renovation contractors that serve Kokubunji City!
1. Equipment Specialized for In-House Renovations
At Kakeru Koumuten, we have organized warehouses and material storage to provide high-quality renovations at low cost. We have five bases in Kanagawa and Tokyo, including Aoba-ku, Yokohama and Machida City, Tokyo.
In-House Scaffolding Materials
We can construct the temporary scaffolding necessary for exterior renovations using our own scaffolding materials and in-house scaffolding team. This leads to cost savings on scaffolding work since we do not outsource. We own scaffolding materials for approximately 50 houses.
Storage of Materials in Our Large Warehouse
We store roofing materials and paints. By placing large orders at once, we can procure materials at a lower cost, and since we always have stock available, we can respond quickly in emergencies. We also have a variety of tools ready for different types of construction, including compressors and cleaning machines.
In-house waste separation
In exterior renovations, various types of waste such as paint, wood, and metal are generated. Our company is committed to separating and recycling waste, striving for proper disposal and cost reduction.
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 simulations and heat-resistant paint testing equipment. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama, and is accessible from Tokyo as well.
2. Complete in-house construction
A major strength of Kakeru Koumuten Co., Ltd. is our in-house construction system for exterior renovations. By maintaining a consistent system from inquiry to project completion, we manage costs and quality effectively. A single representative handles everything from estimation to project completion, ensuring smooth communication without changes in personnel for sales and construction management. We handle everything in-house, from temporary scaffolding installation to exterior wall painting and roof renovations, while establishing a construction system tailored to the specifics of interior and equipment work. We are confident in our plans and costs, so we welcome competitive estimates.
3. 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 wall painting and joint sealing work come with a warranty. Aftercare is available annually, and we send out reminder DM notifications 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 our customers’ wishes and can also provide emergency measures for sudden leaks.
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 differ based on 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, both exterior and interior, to ensure their satisfaction.
7-1. Exterior Renovation Simulation
We offer 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 color patterns based on our recommendations. 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. We also handle solar panel and storage battery installation!
As part of renovations for used properties, more customers are introducing solar power systems, which have substantial subsidies available. Kakeru Koumuten Co., Ltd. also handles solar equipment installation and can propose solar panels tailored to the shape of your roof. We can also accept requests for estimates and power generation simulations only.
09Existing and Vacant Home Renovation in Kokubunji City | Frequently Asked Questions
Here are answers to common questions from people considering renovation of existing or vacant homes in Kokubunji City.
Should I arrange renovations after buying an existing home, or consult you before buying?
If possible, please consult us before deciding to buy. Existing homes may have deterioration that is not visible, and unexpected construction costs after purchase are not uncommon. By checking the condition of the property you are considering and estimating the necessary renovations in advance, Kakeru Koumuten can help you make a realistic financial plan.
Which renovations should take priority in an existing detached house in Kokubunji City?
Priorities depend on the building’s condition. We first address problems that can worsen if left untreated, including leaks, termites, structural issues and earthquake resistance. We then determine the order of work on the roof, exterior walls and other exterior elements, the kitchen, bathroom and toilet, and thermal insulation, according to your budget and the impact on daily life. In pleasant residential areas along the Kokubunji escarpment and its springs, roofs and exterior walls may reach the end of their service life first, so we recommend inspecting the entire building, including the exterior.
I bought an existing wooden detached house in Kokubunji City. Can I use seismic retrofit subsidies?
Kokubunji City’s seismic retrofit subsidy covers 8/10 of construction costs, up to 1,000,000 yen. You must undergo the city’s seismic assessment, sign the construction contract after the subsidy award decision, and have retrofit work supervised by a city-registered seismic assessor. Renewable-energy and energy-saving subsidies include highly insulated windows (1/8, up to 80,000 yen) and solar power (30,000 yen/kW, up to 150,000 yen). The 2nd application period is scheduled to begin on December 1. Confirm eligibility with the city in advance for every program.
How much does a full renovation cost?
The cost of fully renovating a detached house varies greatly with the scope and specification. Work focused on partial renovations starts at around 5 million yen, while extensive renovations covering the interior, exterior, kitchen and bathrooms, insulation and seismic upgrades may cost 10–20 million yen or more. We first inspect the property and propose a plan with priorities that fit your budget.
Do I apply for subsidies myself? Is the procedure difficult?
The applicant varies by program. For example, under the national Mirai Eco Housing 2026 program, registered contractors (construction companies) submit the application. Municipal seismic retrofit subsidies and home modifications covered by long-term care insurance generally require the individual to apply, but we explain the necessary documents and steps. We can also help you identify which programs may be available, so please contact us.
What risks arise if a vacant house is left unattended?
Water leaks and termite damage may worsen, deteriorating roofs and exterior walls can reduce property value, and garden trees and equipment may fall into neglect. If the municipality issues a recommendation concerning a poorly managed vacant house or a designated vacant house, the residential land exemption for fixed asset tax may cease to apply. Inspecting the property early and carrying out the necessary work according to your plans to live in, rent, sell or otherwise use it can help reduce costs in the long run.
I am concerned about earthquake resistance. How should I assess an existing detached house?
The construction date is an important guide. Check whether the house was built in or after June 1981 (the newer seismic standards), and in or after June 2000 (stricter rules for connections and foundations). We recommend a seismic assessment for wooden detached houses built earlier. Your municipality also offers subsidies for seismic retrofitting of wooden houses, which can substantially reduce costs if you qualify (see the subsidy section above). Kakeru Koumuten can advise you from assessment through renovation.
Will I need temporary accommodation during construction? How long will the work take?
It depends on the scope of work. Exterior renovations and partial interior work can often be carried out while you continue living in the home, but we may recommend temporary accommodation for extensive full renovations involving the kitchen and bathrooms. Typical durations are about 2–4 weeks for exterior work and about 1–3 months or more for full renovations. We provide a schedule in advance and propose a plan that minimizes disruption to daily life.
Is Kokubunji City within your service area? Are there travel charges?
Yes, Kokubunji City is within Kakeru Koumuten’s service area. We have 5 bases in Kanagawa and Tokyo, including Aoba Ward, Yokohama, and Machida City, Tokyo. Estimates are completely free. Please feel free to contact us.
Leave your renovations in Kokubunji City to Kakeru Koumuten!
“I want my renovation to last a long time with just one project,” “I want to keep costs down as much as possible,” “I want to improve insulation because my home is hot”—we will propose the best solutions for your specific requests. We do not suggest unnecessary work that prioritizes profit.
We are confident in our costs, quality, and planning, so we welcome comparison estimates. Estimates are completely free.
Get your free estimate and consultation here
If you find our company to be inferior to others, feel free to decline.
View Kakeru Koumuten’s project examples
View our service menu and price list
10Features of Kokubunji City
Kokubunji City in Tokyo is served by the Chuo Line and Seibu Line, known for its greenery and spring water along the Kokubunji Cliff Line (Hake) and the O-taka Path, making it a town blessed with history and nature. It features a calm residential area that is popular for its livability.
Houses developed during the Showa era are now entering a generational transition, expanding options for living on through renovations of used homes. Kakeru Koumuten Co., Ltd. is based in Aoba-ku, Yokohama, and Machida City, Tokyo, and offers a wide range of exterior and interior renovations throughout Kanagawa and Tokyo Prefectures. We handle exterior work such as roofs and walls with a self-construction system, while we establish an appropriate construction system for interior and equipment work based on the content.
Renovation Service Areas
Kakeru Koumuten Co., Ltd. accepts requests across all areas of Kanagawa and Tokyo Prefectures.
Service Areas in Kokubunji City, Tokyo (Main Areas)
Honcho / Minamimachi / Honda / Higashimotocho / Nishimotocho / Higashikoi-Gakubo / Nishikoi-Gakubo / Izumimachi / Hikarinomachi / Takagimachi / Namikimachi / Fujimoto / Hiyoshicho / Kitamachi / Tokura / Naito / Shinmachi / Nishimachi / Tokura and other areas throughout Kokubunji City
・Check out Kakeru Koumuten’s renovation case studies here!
・Kakeru Koumuten Co., Ltd. Construction Menu and Price List
・Reasons why Kakeru Koumuten is chosen!
・About Kakeru Koumuten’s Warranty and Aftercare
・Company Overview of Kakeru Koumuten Co., Ltd.
・Roofing Work and Construction Achievements in Kokubunji City
・Exterior Renovations in Kokubunji City
・Leak Repairs in Kokubunji City
・Solar Panel and Storage Battery Work in Kokubunji City
・Staff Blog and Announcements from Kakeru Koumuten Co., Ltd.
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contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
