[Ooi Town, Kanagawa Prefecture] Renovation of Vacant Houses and Used Properties | Costs, Subsidies, and Case Studies
For those considering renovations of used properties and vacant houses in Oi Town
I bought a used property, but I’m unsure 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.
Kakeru Koumuten Co., Ltd., which has numerous achievements in Oi Town, will clearly explain the key points for a successful renovation to address these concerns.
Let’s obtain estimates from at least 3 companies!
01Reasons for the Increase in Renovation of Used Properties and Vacant Houses in Oi Town
Oi Town is a nature-rich town spread across the hills and farmlands of the Ashigara Plain, with views of Mount Fuji and Tanzawa. It is easily accessible via the Odakyu Line, JR Gotemba Line, and the Tomei Expressway, making it a convenient residential area close to Odawara and Matsuda.
The residential areas developed during the Showa era are now entering a generational transition period, with many homes reaching 40 to 50 years old. This is why the option of “buying a used house and renovating it to fit your lifestyle” is becoming more popular in Oi Town.
Natural Environment of the Ashigara Hills and Farmlands
A nature-rich town with views of Mount Fuji and Tanzawa. There is a growing demand for used properties and renovations for relocation and dual residences.
Retaining Walls and Drainage in Hilly and Sloped Areas
Residential areas in hilly regions have elevation differences, requiring checks on retaining walls, slopes, and drainage, as well as considerations for scaffolding and material transport.
Temperature Differences and Insulation
This area experiences temperature differences, making it effective for insulation renovations (such as windows and interior windows) to address winter cold and condensation issues.
Be Cautious of the “Boundary” of New Earthquake Resistance Standards
The seismic resistance of used houses varies greatly depending on the construction period. It is important to determine whether it was built before the standard revisions of 1981 and 2000.
In this article, we summarize the reasons, points to consider, cost estimates, the latest subsidies for 2026, and how to choose a contractor from the perspective of Kakeru Koumuten Co., Ltd. for those considering renovating used properties and vacant houses in Oi Town to avoid “failure”.
The most important thing is “multiple estimates”
To avoid failure in renovations, the most crucial step is multiple estimates. First, obtain estimates from at least three companies that operate in the Oi Town 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 utilizing renovated used properties. There is a growing interest in the lifestyle of purchasing used homes and renovating or remodeling them. 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 less livable as they are. By renovating and updating the facilities and interiors, you can create a comfortable living environment. Furthermore, by changing the layout and refreshing the interior, you can finish a home that suits your family’s lifestyle while keeping costs lower than a new build.
Reason 2 To increase asset value for resale
More people are purchasing and renovating used properties with the intention of resale. Used homes are often valued low as they are, but renovations can enhance their appearance and performance, thereby increasing their value as properties.
Reason 3 To utilize as an investment or business
For purchases aimed at investment or business, renovations are essential. By transforming them 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 builds, and depending on the purpose and conditions, they may also qualify for subsidies and tax incentives, leading to an increase in the number of 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 your renovation with peace of mind. 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 perform 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 Condition 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 the property has been lived in by someone else, internal damage is often not apparent without investigation. Conduct a current condition survey before starting work to identify 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 homes built before that may not meet current standards. Additionally, 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 the 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 can be supported. Tax deductions include the “housing loan tax deduction” when using a mortgage, 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).
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 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
| Construction Content | Estimated Cost |
|---|---|
| Roof Repair and Painting | Approximately 200,000 to 800,000 yen |
| Roof Replacement / Roof Overlay (Cover Method) | Approximately 700,000 to 2,500,000 yen |
| Exterior Wall Painting | Approximately 600,000 to 1,500,000 yen |
| Exterior Wall Replacement / Overlay (Cover 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 Facilities
| 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 Improvement (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 based on area and method. Please confirm the exact costs through a free on-site survey and estimate.
Please see the construction menu and price list for more details!
05[Latest 2026] Subsidies and Grants Available in Oimachi
One way to renovate used properties and vacant houses affordably is to utilize the subsidy and grant system. As of 2026, we have summarized the main systems that residents of Oimachi may be able to use.
* The following information is as of September 7, 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 application methods 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 is a successor to the “Child-Rearing Green Housing Support Project.” In principle, it requires renovation work that includes insulation improvements for openings (windows) and the building structure, and is applicable to eco-friendly housing equipment, child-rearing compatible renovations, disaster prevention enhancements, and barrier-free renovations.
Subsidy upper limit guidelines: For buildings constructed before 1991, up to 1,000,000 yen per unit (50,000 yen depending on the construction content), for buildings constructed between 1992 and 2016, up to 800,000 yen per unit (400,000 yen for the same). Eligible construction must start on or after November 28, 2025, and applications will be accepted starting June 30, 2026. Reservations must be made by November 16 at the latest, and subsidy applications must be submitted by December 31 at the latest (early termination may occur if the budget limit is reached). Applications must be made through registered contractors.
This program covers insulation renovations for windows, including the installation of interior windows, replacement of exterior windows, and glass replacements. The subsidy amount is substantial and is effective for countering cold, heat, and condensation. It can easily enhance the insulation performance of existing homes.
The subsidy amount varies depending 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 have been accepted since March 31, 2026, and subsidy applications must be submitted by December 31 at the latest (early termination may occur if the budget limit is reached). Applications must be made through registered contractors.
This program targets the replacement of water heaters with high-efficiency models such as EcoCute, hybrid water heaters, and EneFarm. It is a suitable program for older properties planning to replace their water heaters.
Subsidy amount guidelines: 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 on or after November 28, 2025, and applications will be accepted starting March 31, 2026 (early termination may occur if the budget limit is reached).
Oimachi Program
This program supports the earthquake resistance of wooden detached houses built under old earthquake resistance standards. Non-taxable households receive a generous 3/4 subsidy, up to 1,500,000 yen, making it effective for earthquake resistance renovations combined with the purchase of existing detached houses. There is no specification regarding the limitation of contractors to the town (please confirm).
The target is wooden houses built using traditional frame construction methods with two stories or less that received building confirmation before May 31, 1981, and have a seismic diagnosis score of less than 1.0. The seismic diagnosis is fully covered, with a maximum limit of 100,000 yen (conducted by a registered architect who has completed the required training). Prior consultation is mandatory. The application status for the fiscal year 2028 needs to be confirmed. For details, please visit the official page of Oi Town.
Insulation renovations for windows, walls, ceilings, and floors are eligible, and window renovations are also included. This town program is for those who want to improve the insulation performance of existing homes, and there are no restrictions on contractors being within the town.
The requirement is to renovate all windows in a room or all walls, ceilings, and floors. Products registered with the national government, etc., for windows and insulation materials are eligible. Applications are being accepted on a first-come, first-served basis starting April 1, 2028 (ends when the budget runs out; prior application before construction is mandatory). For details, please visit the official page of Oi Town.
This town program is for those looking to introduce solar power and storage batteries in conjunction with renovations of existing properties. There are no restrictions on contractors being within the town.
Solar power is 20,000 yen/kW, with a maximum of 100,000 yen; HEMS flat rate is 20,000 yen; storage battery flat rate is 50,000 yen. Requirements include residing in the town, having a lighting contract, and no delinquency on town taxes. Applications for the fiscal year 2028 are currently open, but there are limited slots, and early closure is expected, so please confirm. For details, please visit the official page of Oi Town.
You can utilize the removal of dangerous block walls facing the road (1/2, with a maximum of 200,000 yen for removal only, and a maximum of 300,000 yen including the installation of safety structures) and home renovations under long-term care insurance. There are no restrictions on contractors for block wall construction being within the town.
Block walls are subject to removal if they exceed 0.6m in height from the road or property line and face an evacuation route; submission of an estimate is mandatory; prior consultation is mandatory. Home renovations under long-term care insurance have a payment limit of 200,000 yen (generally 90% coverage). The availability of Oi Town’s unique general barrier-free renovation subsidy is currently unconfirmed (please check). For details, please visit the official page of Oi Town.
* In Oi Town, there is no specific mention of contractors limited to the town in the publicly available documents, so it is highly likely that our company (Aoba-ku, Yokohama) can also utilize the programs. However, please confirm with the town before applying (applications for all programs must be made before the construction contract and commencement). The insulation renovation subsidy (1/3 for windows, up to 80,000 yen) is easy to use, and it is effective when combined with the national “Housing Energy Efficiency 2026 Campaign” and Kanagawa Prefecture’s existing housing energy efficiency renovation subsidy. There is a vacant house bank, but currently, there are no unique town subsidies for renovation work. There are no unique town grants for general renovations.
View information on renovation tax reductions and other programs
- Housing Loan Tax Reduction: If you use a housing loan for renovations that meet certain requirements, income tax and other deductions will be based on the year-end balance.
- Renovation Promotion Tax System (Investment-type Tax Reduction): For construction such as earthquake resistance, energy conservation, barrier-free, and long-term excellent housing, you may be eligible for income tax deductions even with your own funds.
- Reduction of Fixed Asset Tax: There are systems that reduce fixed asset tax for a certain period for earthquake-resistant renovations, energy-saving renovations, and barrier-free renovations.
- Kanagawa Prefecture’s Existing Housing Energy Efficiency 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 planned from September 7 to September 30, 2026, only via electronic application and on a first-come, first-served basis (approximately 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 programs can be used for your construction after an on-site survey.
06Customer Feedback
カテゴリ ‘voice’ は見つかりません
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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
Aoba-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 Studies in Oi Town
| Construction Location | Ashigarakami-gun, Kanagawa Prefecture |
|---|---|
| Work Details | Temporary scaffolding installation / Roof overlay work |
| Existing Roofing Material | Slate (Colonial) / Corrugated metal |
| New Materials Used | Roofing Material: Aiji Industrial / Super Galtect |
| Price Range | 700,000 – 800,000 yen |
| Completion Month | January 2024 |
Our Proposal
After checking the condition of the existing slate roof and corrugated metal, we proposed a roof overlay work that utilizes the existing roof by layering new waterproof paper and roofing material. For the new roofing material, we adopted Aiji Industrial’s Super Galtect, which is lightweight and excels in insulation and durability. We also tailored the metal parts to match the roof shape, enhancing the overall waterproofing and durability of the roof.
▶ Roof repair and renovation in Ashigarakami-gun
▶ Leak repair in Ashigarakami-gun
▶ Kakeru Koumuten’s construction menu and price list
07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Oi Town
There are many renovation companies that serve Oi Town, and it can be confusing to decide which one to choose. When requesting renovations, be sure to check the following five points.
- Rich experience in renovation work
- Check for warranties and after-sales maintenance
- Obtain estimates from multiple contractors (at least three companies)
- Confirm whether they perform renovations in-house
- Check if they offer color simulations and perspective drawings
1. Rich experience in renovation work
Many renovation contractors publish their work results on their websites. If the 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. In particular, Google reviews are useful, but do not make your decision based solely on reviews; evaluate comprehensively along with work results, estimates, and warranty details.
2. Confirm the presence of 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 or partial repairs are often not covered). Some contractors also offer aftercare services, so be sure to check that as well.
Kakeru Koumuten Co., Ltd. provides warranties for exterior renovations and sealing work. We also conduct aftercare services and send out annual reminder DM, allowing for annual inspections.
Click here for more details on Kakeru Koumuten’s warranties and aftercare services
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 work, warranties, aftercare services, and costs can vary significantly. Having multiple estimates makes price negotiations easier.
When comparing estimates, look closely at not just the costs, but also the “items in the estimate,” “verification of undercoating materials, sealing materials, and auxiliary paint,” and “confirmation of the process.” Lowering the rank of auxiliary parts or skipping processes can reduce costs, so it is important to not judge solely based on price.
See detailed points for comparing estimates
4. Confirm whether the company performs renovations in-house
At Kakeru Koumuten Co., Ltd., we conduct detailed hearings and investigations regarding the existing “condition,” “location,” “materials,” “desired durability,” and “design,” and propose the most suitable plan. While there is nothing inherently wrong with a system where a partner company carries out the construction, it is important to confirm whether the contracted company understands the construction details and has clear responsibilities for quality control and guarantees. With in-house construction, it is easier to coordinate with the site, allowing for quick responses in the event of any issues.
5. Do they offer color simulations and perspective drawings?
Choosing colors and envisioning the look after construction can be challenging for both exterior and interior projects. With simulations, you can reduce the risk of mistakes like “it looks different than I imagined.” Since it is difficult to redo once construction is completed, it is advisable to choose a company that can accommodate flexible simulations.
08Reasons Why Kakeru Koumuten is Chosen for Renovations of Used Houses in Oimachi
One reason is that “Kakeru Koumuten also serves Oimachi,” but
our unique approach to “renovating vacant houses and used properties” that cannot be imitated by other companies
has received high praise from many customers.
We have absolute confidence in “cost,” “quality,” and “plans” for renovations in Oimachi. Please compare our estimates with those of other companies.
The most important aspect of renovations is getting multiple estimates. Request estimates from at least three renovation contractors that cover the Oimachi area!
1. Equipment Specialized for In-House Renovations
At Kakeru Koumuten Co., Ltd., we have arranged warehouses and material storage to provide high-quality renovations at low costs. We have five bases located in Kanagawa Prefecture and Tokyo, including Aoba-ku, Yokohama, and Machida City, Tokyo.
In-House Scaffolding Materials
For exterior renovations, we can construct temporary scaffolding using our own scaffolding materials and in-house scaffolding team. By not outsourcing, this leads to cost savings on 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 large orders at once, we can purchase materials at lower prices, and since we always have stock available, we can respond quickly in emergencies. We also have various tools ready for different types of construction, including compressors and cleaning machines.
In-house waste separation
In exterior renovations, various waste materials such as paint, wood, and metal are generated. Our company properly separates waste materials and recycles those that can be reused, striving to reduce environmental impact and disposal costs.
Showroom dedicated to exterior renovations
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 a heat-resistant paint testing machine and color simulation. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama.
2. In-house Construction Focused on Exterior Work
A major strength of Kakeru Koumuten Co., Ltd. is our in-house construction focused on exterior work. 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 personnel for sales and construction management. We carry out the work primarily with our own craftsmen, from temporary scaffolding setup to exterior wall painting and roof renovations. 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 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 every year. If you are concerned about the warranty, please click on the image above to check.
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 using 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 only.
6. Human Resource Development
We create various models for skill improvement and conduct practical training. Since exterior renovations differ in construction methods and materials based on existing materials and shapes, we regularly conduct technical improvement education so that each staff member can respond to 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 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 patterns with our recommended color schemes. We also accommodate “test painting” and “arranging paint boards” to confirm the actual colors.
7-2. Interior Renovation Simulation
We also support simulations and perspective drawings for interior renovations. We will propose recommended simulations based on your preferred image, such as a modern style. Realistic perspectives will be created from actual floor plans.
8. Solar Panel and Storage Battery Installation Work Available!
More customers are introducing solar power systems with generous 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.
09 Renovation of Used Properties and Vacant Houses in Oimachi | Frequently Asked Questions
We will answer the most frequently asked questions from those considering renovations of used properties and vacant houses in Oimachi.
Is it better to consult before buying or after purchasing a used property for renovation?
Please consult us before making a purchase decision if possible. Used properties often have deterioration that is not visible, and it is not uncommon to encounter unexpected construction costs after purchase. By having Kakeru Koumuten check the condition of the property you are considering in advance and providing an estimate for necessary renovations, you can establish a feasible financial plan.
What renovations should be prioritized for a used detached house in Oimachi?
It depends on the condition of the building, but we prioritize areas that could lead to further damage if left unattended, such as leaks, termites, structure, and seismic resistance. After that, we decide on the order of roof and exterior walls, water areas (kitchen, bathroom, toilet), and insulation based on your budget and impact on daily life. In residential areas spread across the hills and farmlands of Ashigara, roofs and exterior walls often reach the end of their lifespan first, so we recommend starting with a comprehensive inspection of the entire building, including the exterior.
I bought a used detached house in Oimachi. Can I use subsidies?
Oi Town is a nature-rich area that spreads across the hills and farmlands of Ashigara, with a significant temperature difference due to its inland location, making insulation renovations effective. Subsidies for seismic retrofitting of wooden houses (1/2, up to 1 million yen; for tax-exempt households, 3/4, up to 1.5 million yen), existing housing insulation renovation subsidies (1/3, up to 80,000 yen including windows), smart energy equipment subsidies, and block wall removal subsidies are expected to be available even for our company outside the town, as there are no restrictions listed for local contractors in the published materials (please confirm with the town before applying). We will first propose inspections for exterior, water areas, seismic, and insulation.
How much does a full renovation (full remodel) cost?
The cost of a full renovation for a detached house varies greatly depending on the scope and grade. If focusing on partial renovations, it typically starts from around 5 million yen, while large-scale renovations that include both interior and exterior, water areas, insulation, and seismic upgrades can exceed 10 million to 20 million yen. We will first conduct a site survey to assess the condition and propose a prioritized plan that fits your budget.
Do I need to apply for subsidies myself? Is the process difficult?
The applicant varies depending on the system. For example, the national “Mirai Eco Housing 2026 Project” has a structure where registered contractors (construction companies) apply. For seismic retrofitting and home modifications under nursing care insurance in your municipality, the application is generally made by the homeowner, but we will guide you through the necessary documents and process. We will organize and inform you about “which systems are available,” so please feel free to consult with us first.
What risks are there if I leave a vacant house unattended?
Risks include the progression of leaks and termite damage, depreciation of asset value due to deterioration of exterior walls and roofs, and neglect of garden trees and equipment. Additionally, if you receive a recommendation from the municipality as a “poorly managed vacant house” or “designated vacant house,” there is a possibility that the special exemption for residential land property tax will be revoked. Conducting inspections early and carrying out necessary renovations according to your plans to live in, rent, sell, or utilize the property can ultimately help reduce costs.
I am concerned about seismic resistance. How can I assess the seismic safety of a used detached house?
The construction date is a significant indicator. Check if it was built after June 1981 (new seismic standards), and further if it was built after June 2000 (strengthening of joint and foundation regulations). For wooden houses built before this, we recommend a seismic diagnosis. There are also subsidies for seismic retrofitting of wooden houses in your municipality, which can significantly reduce costs if eligible (for details, see the subsidy section above). Kakeru Koumuten Co., Ltd. will assist you from diagnosis to renovation.
Will I need temporary housing during construction? How long will it take?
This depends on the scope of the work. Exterior renovations and partial interior work can often be done while you remain in your home, but for large-scale full renovations that include water areas, we may recommend temporary housing. The estimated duration is about 2 to 4 weeks for exterior work and about 1 to 3 months or more for full renovations. We will provide a schedule in advance and propose a plan that minimizes the impact on your daily life.
Is Oi Town within your service area? Will there be travel costs?
Yes, Oimachi is within the service area of Kakeru Koumuten Co., Ltd. Our headquarters is located in Aoba-ku, Yokohama, and we have five bases in Kanagawa and Tokyo, covering the entire regions of both prefectures. Estimates are completely free, and we do not engage in persistent sales tactics. Please feel free to consult with us first.
Leave your renovations in Oimachi 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 will not suggest any unnecessary work focused on profit.
We are confident in our costs, quality, and planning, so we welcome competitive estimates. Estimates are completely free.
Get your free estimate or consultation here
If you find our company to be inferior to others, feel free to decline outright.
View Kakeru Koumuten’s project examples
View our service menu and price list
10Features of Oimachi
Oimachi is a nature-rich town that spreads across the hills and farmlands of the Ashigara Plain, offering views of Mount Fuji and the Tanzawa mountains. It is conveniently located near the Odakyu Line, JR Gotemba Line, and the Tomei Expressway, making it a comfortable residential area close to Odawara and Matsuda.
The post-war single-family home area is now undergoing generational changes, with the choice of buying used homes and renovating them becoming established. Kakeru Koumuten is headquartered in Aoba-ku, Yokohama, and we offer a wide range of exterior and interior renovations throughout Kanagawa Prefecture. We are capable of in-house construction primarily focused on exterior work such as roofs and walls.
Areas Available for Renovation
Kakeru Koumuten accepts requests throughout Kanagawa and Tokyo.
Main Areas in Oimachi
Kaneko / Kamioi / Nishi-Oi / Higashi-Oi / Yanagi / Yamada / Akada / Shinokubo / Takao / Bessho / Kawahara / Koyasu / Aiwa and other areas throughout Oimachi
We also welcome consultations via LINE◎
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株式会社翔工務店へ
株式会社翔工務店は平均年齢２０代後半の若い会社ですが、技術はどこにも負けていません。
いちばんの強みは、足場工事、屋根工事、塗装工事とすべて自社で行えること。一般には分業されるこの業界にあって、一式で頼めるので管理に手間がかからず、コストも抑えることが出来ます。何より、トラブルがあればすぐにかけつけます！
自信をもって、宣言できます。私たちは、神奈川で一番若くて親切なリフォーム屋です！
