[Ota-ku, Tokyo] Renovation and Remodeling of Vacant Houses and Used Detached Houses | Costs, Subsidies, and Important Points
Welcome to Kakeru Koumuten Co., Ltd., your trusted partner for roofing, rain gutters, and exterior painting services. We pride ourselves on delivering high-quality workmanship and exceptional customer service.
Our team of skilled professionals is dedicated to ensuring your home is protected and looks its best. Whether you need a roof overlay, new rain gutters, or a fresh coat of paint, we have the expertise to handle it all.
Contact us today to learn more about our services and how we can help you with your next project!
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Welcome to Kakeru Koumuten Co., Ltd.
Subsidy Information
We offer various subsidies for roof and exterior painting projects. Please contact us for more details.
Up to ¥100,000
Frequently Asked Questions
What is the roof overlay method?
The roof overlay (cover method) is a technique used to install a new roof over an existing one, providing enhanced durability and aesthetics.
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For those considering renovation of used properties and vacant houses in Ota-ku
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 available.
For such concerns, Kakeru Koumuten Co., Ltd., which has a proven track record in exterior renovations in Ota-ku, will clearly explain the key points for a successful renovation.
Obtain estimates from at least 3 companies!
01Reasons for the Increase in Renovations of Used Properties and Vacant Houses in Ota-ku
Ota-ku, Tokyo, is a city with a diverse character, ranging from the upscale residential area of Denenchofu to the downtown of Kamata, and the industrial area of Haneda and Rinkai. It is one of the largest wards in terms of both population and area, with residential developments varying significantly by region.
In areas such as Omori, Kamata, and Haneda, there are regions with a high concentration of wooden houses (wood density), and many older detached houses remain. This is why the option of “buying a used detached house and renovating it while reviewing seismic resistance, fire prevention, and insulation” is expanding in Ota-ku.
Diverse Residential Areas
From the upscale residential area of Denenchofu to the quiet neighborhoods of Kugahara and Yukigaya, and the downtown areas around Kamata, the optimal renovations vary by area.
Regions with High Concentration of Wooden Houses (Wood Density)
In parts of the ward, such as around Omori, Kamata, and Haneda, there are areas densely populated with wooden houses, making it important to review seismic resistance and fire prevention. These are key points to prioritize in the renovation of used detached houses.
Considerations for Narrow Lots and Access Roads
Due to many sites being narrow and having close proximity to neighboring buildings, construction that takes into account the installation of scaffolding, fire prevention, and delivery plans is required.
Utilization of Vacant Houses and Assets
The number of houses that have become unused due to inheritance is increasing. There is a growing demand for consultations regarding renovations aimed at living in, renting out, or selling, as well as seismic and energy-saving improvements.
In this article, we summarize the reasons, points to consider, cost averages, the latest subsidies for 2026, and how to choose a contractor from the perspective of Kakeru Koumuten, a company closely connected to the community, to help those in Ota-ku who are considering renovating used properties or vacant houses to avoid “failures.”
The Most Important Thing is “Comparative Estimates”
The most crucial factor in avoiding failures in renovations is comparative estimates. First, obtain estimates from at least three companies that operate in Ota-ku. 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 housing market in Japan has expanded the options for utilizing not only new constructions but also renovated used properties. There is a growing interest in living in or renovating purchased 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 updating the facilities and interiors, you can create a comfortable living environment. Additionally, depending on the condition of the building and the scope of the work, you can achieve a home that suits your family’s lifestyle while keeping costs lower than new construction.
Reason 2 To Increase Asset Value for Sale
More people are purchasing and renovating used properties with the intention of selling them. Used houses are often valued low in their current state, but renovations can enhance both appearance and performance, leading to the maintenance and increase of property value.
Reason 3 To Utilize as an Investment or Business
When purchasing for investment or business purposes, renovations are essential. By transforming a property into a highly designed rental or share house, you can differentiate it from other properties, and depending on the location and planning, you can also expect improved profitability. Initial costs can be lower than new construction, and depending on the use and conditions, there may be subsidies or tax incentives available, 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 choose 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 see them in person. Select a contractor who can carry out the work properly according to your preferences, the structure of the house, and the surrounding environment, and who also provides after-sales support after the construction is completed.
Point 2 Always Check the Deterioration of the Building
For used properties and vacant houses, it is crucial to check which parts have deteriorated and to what extent beforehand. Since the property has been occupied by someone else, internal damage is often not apparent without investigation. Conduct a current condition survey before starting construction to identify any hidden deterioration.
Point 3 Review Earthquake Resistance and Insulation Performance
In the renovation of used and vacant houses, it is particularly important to review earthquake resistance and insulation. The earthquake resistance standards were significantly revised on June 1, 1981, and houses built before this date may not meet current standards. Furthermore, on June 1, 2000, regulations regarding the joints and wall arrangements of wooden houses were clarified, 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 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-resistant renovations, energy-saving construction, and barrier-free renovations may be supported. There are tax deductions available for using housing loans, such as the “housing loan tax deduction,” and systems that allow for deductions on certain costs even with personal funds. These can sometimes be used in combination, so it is crucial to check in advance and plan strategically to ensure the success of your renovation (for the latest information, see this subsidy section).
04Cost Estimates for Renovating Vacant Houses and Used Properties
The cost of renovating used properties and vacant houses varies 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 typical 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 / 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-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 over 3,000,000 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 see the construction menu and price list for more details!
05[Latest 2026] Subsidies and Grants Available in Ota Ward
One way to renovate used properties and vacant houses cost-effectively is to utilize the subsidy and grant system. As of 2026, we have summarized the main systems that residents of Ota Ward may be able to use.
* The following information is as of August 28, 2026. The content, duration, and budget of the systems change 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 applicant and application methods vary by system.
National Program: Housing Energy Saving 2026 Campaign
The government is implementing multiple subsidy projects targeting energy-saving renovations under the “Housing Energy Saving 2026 Campaign.” Construction for insulation, windows, and water heaters may be eligible for these subsidies when used in combination.
This program succeeds the “Child-Rearing Green Housing Support Project.” Rooms with openings facing the exterior are designated as “trigger rooms,” requiring specified combination works such as insulation for openings and structures. Additional eco-friendly housing equipment, child-rearing compatible renovations, disaster prevention improvements, and barrier-free renovations may also be eligible.
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 after November 28, 2025, and applications will be accepted starting June 30, 2026. Reservations must be made by November 16 at the latest, and grant applications must be submitted by December 31 at the latest (early termination may occur if the budget limit is reached). Applications must be made by registered contractors.
Renovations for window insulation, including the installation of interior windows, replacement of exterior windows, and glass replacement, are eligible. The subsidy amount is significant and effective for addressing cold, heat, and condensation issues. It can easily enhance the insulation performance of existing homes.
Subsidy amounts vary based on window construction methods, performance, size, and the type of house. If the total subsidy amount for a single 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 (early termination may occur if the budget limit is reached). Applications must be made by registered contractors.
This program targets the replacement of water heaters with high-efficiency models such as eco-cute, hybrid water heaters, and EneFarm. It is well-suited for used properties planning to replace their water heaters.
Subsidy amount guidelines: Eco-cute 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 will be accepted starting March 31, 2026 (early termination may occur if the budget limit is reached).
Tokyo Metropolitan Program
High-insulation windows (installation of interior windows, replacement of exterior windows, glass replacement), high-insulation doors, insulation materials, and high-insulation bathtubs are eligible. This program offers significant subsidies that can greatly 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 if including thermal security windows), insulation materials are eligible for 1/3 of the eligible expenses with a cap of 1 million yen, and high thermal insulation bathtubs are 95,000 yen per unit. Pre-application starts on May 29, 2026, and application for grants is accepted from June 30, 2026. In principle, contracts and construction must be done after the pre-application acceptance. Individuals and corporations owning residences in Tokyo are eligible. The program is operated by Cool Net Tokyo. For more details, visit the official page.
When you replace your air conditioner, refrigerator, water heater, or LED lighting with energy-efficient models at registered retailers, the equivalent amount of Tokyo Zero Emission Points is discounted at the time of purchase. This program is well-suited for updating equipment when moving into a used property.
Estimated amounts: Air conditioners 9,000 to 23,000 yen, refrigerators 14,000 to 26,000 yen, water heaters (such as eco-cute) 12,000 points, LEDs 4,000 yen, etc. Replacements are valid until March 31, 2027. Individuals with an address in Tokyo are eligible. For more details, visit the official page.
The new installation of solar power equipment and storage batteries for existing homes may be eligible for individual projects by the Tokyo Metropolitan Government. This is aimed at those considering energy-saving measures for used homes and countermeasures against power outages.
For solar power in existing homes, if it is 3.75 kW or less, the subsidy is 150,000 yen/kW (up to 450,000 yen), and if it exceeds 3.75 kW, it is 120,000 yen/kW (for less than 50 kW). Storage batteries are 100,000 yen/kWh, and if not participating in DR demonstration, the cap is 1.2 million yen per unit. The eligible expenses are capped, and there are additional amounts if participating in DR demonstration. Pre-application is required for both. For more details, visit the official page for solar power and the official page for storage batteries.
Ota City Programs
This program targets construction listed in the district’s eligible construction list aimed at improving housing quality, decarbonization, disaster prevention, and responding to a circular economy. Generally, construction associated with the purchase of vacant homes is not eligible, but there are certain exceptions for child-rearing households.
The amount eligible for subsidies is the lower of the total standard construction cost set by the ward and the total construction cost (excluding tax). For regular renovation work, the subsidy is 10% with a maximum of 200,000 yen, while for seismic reinforcement work and asbestos removal work, the maximum amount varies depending on the conditions. Pre-application is from April 1, 2026, to January 29, 2027, and the deadline for the main application is March 19, 2027, at 5 PM. Since a contract with a small or medium-sized business based in Ota Ward is required, Kakeru Koumuten, which is based in Yokohama, cannot utilize this system. For more details, please visit the official page of Ota Ward.
This is a key program for Ota Ward, which has areas densely populated with wooden houses. It is effective for seismic reinforcement when purchasing used wooden detached houses.
Seismic diagnosis and seismic reinforcement may apply to wooden houses built before the revision of seismic standards in June 2000. Seismic reinforcement work usually covers 2/3 of the cost with a maximum of 200,000 yen (for seismic roads along main roads, it is 3/4 with a maximum of 250,000 yen; if a person with a disability currently resides and meets certain requirements, it is 100% with a maximum of 350,000 yen). Demolition subsidies apply to old wooden houses built before May 1981, with 2/3 of the cost covered for construction by local small and medium-sized businesses (maximum 100,000 yen), and 1/2 of the cost covered for construction by businesses outside the ward (maximum 75,000 yen). Application and approval before contracting are required. For more details, please visit the official page of Ota Ward.
This program is for residents of Ota Ward aged 65 and over who have been certified as requiring support or nursing care and are recognized as needing housing renovations. Subsidies cannot be combined for the same item with nursing care insurance housing renovation costs.
The maximum subsidy limits are 379,000 yen for bathtub replacement, 156,000 yen for sink and washbasin replacement, and 106,000 yen for Western-style toilet conversion, with a personal burden ranging from 10% to 30% based on the nursing care insurance burden ratio. If costs are allocated to different construction items, both systems may be utilized. Be sure to consult with the Community Comprehensive Support Center before starting work. For more details, please visit the official page of Ota Ward.
Support for the removal of dangerous walls facing school routes and emergency transport roads, and the installation of new fences. This program is well-suited for exterior renovations of used homes.
Removal: the lower of 3/4 of the construction cost or 30,000 yen per meter. New fence installation: the lower of 2/3 of the construction cost or 50,000 yen per meter (with a maximum of 300,000 yen for each). Construction is limited to small and medium-sized businesses headquartered in Ota-ku. Application must be made before the contract. The application deadline for the 8th year of Reiwa is January 15, 2027, and completion within the fiscal year is required. The grant period for the program ends at the end of March in the 10th year of Reiwa.
* The Ota-ku Housing Renovation Subsidy and Block Wall Renovation Subsidy require contracts with small and medium-sized businesses headquartered in Ota-ku, so Kakeru Koumuten’s construction cannot be utilized. For programs with different location requirements for construction contractors, such as national and Tokyo Metropolitan programs or Ota-ku’s seismic retrofitting subsidies, we will provide individual eligibility guidance.
See also about 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 applied based on the year-end balance.
- Renovation Promotion Tax System (Investment-type Tax Reduction): For construction related to seismic retrofitting, energy conservation, barrier-free design, and long-term excellent housing, there may be cases where income tax deductions can be received even with personal funds.
- Reduction of Fixed Asset Tax: There is a system that reduces fixed asset tax for a certain period for seismic retrofitting, energy conservation retrofitting, and barrier-free retrofitting.
- Tokyo’s Insulation and Energy Conservation Subsidy: The above “Tokyo Metropolitan Program” (energy conservation renovation promotion project for existing homes, Tokyo Zero Emission Points, etc.) may be combined with the national “Housing Energy Conservation 2026 Campaign.” If you are considering construction for windows, insulation, or high-efficiency equipment, please consult us before starting work.
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 conducting a site survey.
06Customer Voices
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)!
Kakeru Koumuten Co., Ltd. Roof Renovation Case Studies
| Construction Details | Roof Overlay (Cover Method) |
|---|---|
| Existing Roofing Material | Zarufugurassa (Decorative Slate) |
| New Roofing Material | Ai-G Co., Ltd. “Super Galtect” Manufacturer Warranty: Coating 15 years, Red Rust 20 years, Puncture 25 years (Manufacturer’s regulations and applicable conditions apply) |
| Price Range | Tax included 700,000 to 800,000 yen |
Our Proposal
We performed a roof overlay construction by placing the lightweight metal roofing material “Super Galtect” over the deteriorated decorative slate “Zarufugurassa.” By utilizing the existing roof, we minimized the removal area while finishing the entire roof anew.
07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Ota-ku
There are many renovation companies that serve Ota-ku, and it can be confusing to decide which one to choose. When requesting renovations, be sure to check the following five points.
- Having extensive experience in renovation work
- Confirming the presence of warranties and aftercare services
- Obtaining estimates from multiple contractors (at least 3 companies)
- Checking if the company performs renovations in-house
- Verifying if they offer color simulations and perspective drawings
1. Having extensive experience in renovation work
Many renovation contractors publish their construction achievements on their websites. If a contractor provides detailed explanations of the process with photos, it makes it easier to envision the outcome after the project, 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 posts. In particular, Google reviews are useful, but do not make a decision based solely on reviews; consider the construction achievements, estimates, and warranty details for a comprehensive judgment.
2. Confirming the presence of warranties and aftercare services
When selecting a contractor, be sure to check for warranties. Issues that fall under warranty conditions may be eligible for free repairs. Warranty periods and coverage vary depending on the type of work, materials, and construction conditions, and emergency measures or partial repairs may not be covered. Some contractors also offer aftercare services separate from warranties, so be sure to check that as well.
Kakeru Koumuten Co., Ltd. provides warranties based on the type of work and materials used for eligible roof work, exterior wall painting, and sealing work. We also conduct aftercare services and send out annual notification DM, allowing for annual inspections.
Click here for more details on Kakeru Koumuten’s warranties and aftercare services
3. Obtaining 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, aftercare services, and prices can vary significantly. Having multiple estimates makes it easier to negotiate prices.
When comparing estimates, it’s important to look closely at not only the cost but also the “items in the estimate,” “confirmation 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’s essential to not judge solely by the amount.
Learn more about the points for comparing estimates
4. Confirm whether the company conducts renovations in-house
Kakeru Koumuten Co., Ltd. conducts detailed hearings and surveys regarding the existing “condition,” “location,” “base materials,” “desired durability,” and “design,” and proposes 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 contracted company understands the construction details and clearly defines the responsibilities for quality control and guarantees. If the work is done in-house, it becomes easier to coordinate with the site, allowing for quicker responses in case of any troubles.
5. Check if they offer color simulations and perspective drawings
Choosing colors and envisioning the appearance after construction can be challenging for both exterior and interior work. With simulations, you can reduce the risk of the outcome being different from your expectations. Since it is difficult to redo once the work is done, it is advisable to choose a company that can accommodate flexible simulations.
08Reasons why Kakeru Koumuten is chosen for renovations of used houses in Ota-ku
One reason is that Kakeru Koumuten is also available in Ota-ku, but
there are unique initiatives by Kakeru Koumuten for renovations of vacant houses and used properties
which have received high praise from many customers.
We are confident in the cost, quality, and plan for renovations in Ota-ku. Please feel free to compare our estimates with those of other companies.
The most important aspect of renovation is comparing estimates. Be sure to request estimates from at least 3 companies that operate in Ota-ku!
1. Equipment Specialized for Exterior Renovation
Kakeru Koumuten Co., Ltd. has established warehouses and material storage areas to provide high-quality renovations at low cost. We have 5 bases centered around Aoba-ku, Yokohama for material storage and showrooms.
In-House Scaffolding Materials
We can construct temporary scaffolding required for many roof and exterior wall renovations using our in-house scaffolding materials and team. By not outsourcing, we can cut costs on scaffolding work. We have scaffolding materials for approximately 50 houses.
Storage of Materials in Our Large Warehouse
We store a certain amount of roofing materials and paints. By placing large orders at once, we can procure materials at lower prices and respond quickly in emergencies according to our inventory status. We also have various tools available to 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. Our company is committed to sorting and recycling waste materials to help reduce disposal costs.
Exterior Renovation Dedicated Showroom
In the showroom, you can not only have meetings but also check actual paint colors and a wide variety of catalogs. Color simulations and tests for heat insulation properties using heat-resistant paint testing equipment are also available. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama.
2. Complete In-House Construction for Exterior Work
A major strength of Kakeru Koumuten is our complete in-house construction for exterior work. By maintaining a consistent system from inquiry to project completion, we can provide high-quality exterior renovations at reduced costs. 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. All work, from temporary scaffolding setup to exterior wall painting and roof renovations, is carried out by our own skilled craftsmen. We are confident in our plans and costs, so we welcome competitive estimates.
3. Various Permits Obtained & Skilled Workers on Staff
We have obtained licenses 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 notification DM each year. If you have concerns about the warranty, please click on 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 at high places, we can respond using a drone. We also use a thermal imaging camera for leak investigations. We respond according to our customers’ wishes and also accept emergency measures for sudden leaks from exterior walls.
6. Human Resource Development
To enhance skills, we create various models and conduct practical training. Since exterior renovations differ in construction methods and materials based on existing materials and shapes, we conduct regular skill enhancement training to ensure each staff member can handle various sites.
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7. Flexible Simulations for Both Exterior and Interior!
Kakeru Koumuten Co., Ltd. is dedicated to helping our customers choose colors and designs for both exterior and interior renovations, ensuring their valuable buildings meet 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 based on actual photos of your building and propose several color patterns using our recommended color schemes. We also accommodate “test painting” and “sample board arrangements” to confirm the actual color tones.
7-2. Interior Renovation Simulation
We also provide simulations and perspective drawings for interior renovations. Based on your preferred style, such as modern, we can suggest suitable simulations. We create realistic perspectives based on actual floor plans.
8. Solar Panel and Storage Battery Installation Work Available!
Some customers consider installing solar equipment, which has substantial subsidies, in conjunction with renovations of used properties. Kakeru Koumuten Co., Ltd. also handles solar equipment installation and proposes solar panels tailored to the shape of your roof. We can also provide estimates and create power generation simulations upon request.
09Renovation of Used Properties and Vacant Houses in Ota-ku | Frequently Asked Questions
We answer the most frequently asked questions from those considering renovations of used properties and vacant houses in Ota-ku.
Is it better to consult before buying a used property or after purchasing it for renovation?
If possible, please consult us before making a purchase decision. Used properties often have deterioration that is not visible at first glance, 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 Ota-ku?
Depending on the condition of the building, we prioritize areas that, if left unattended, could lead to further damage, such as leaks, termites, structural issues, and seismic resistance. After that, we determine the order of work for exteriors such as roofs and walls, water areas (kitchen, bathroom, toilet), and insulation, based on your budget and the impact on your daily life. Since roofs and walls may also be deteriorated depending on the age and condition of the building, we recommend starting with a comprehensive inspection of the entire building, including the exterior.
I’ve heard that Ota Ward has many areas with dense wooden houses. What should I be aware of when buying a used house?
In densely built wooden areas, the distance between neighboring buildings is often narrow, so it is important to check seismic resistance as well as the designation of fire prevention areas and quasi-fire prevention areas. In locations with narrow lots, consideration is also needed for the installation of scaffolding and the transportation of materials. Ota Ward offers subsidies for seismic retrofitting of wooden houses (up to 2 million yen for renovation work, and up to 2.5 million yen for properties along main roads) and a housing renovation subsidy program that can be used for eligible work (with a general limit of 200,000 yen). However, the housing renovation subsidy requires that the construction company be based in Ota Ward, so it cannot be used for work done by Kakeru Koumuten.
How much does a full renovation (full renovation) cost?
The cost of a full renovation for a detached house varies greatly depending on the size, condition of the building, and equipment grade. If the focus is on surface and equipment updates, it typically starts from around 8 million yen, while large-scale renovations that include interior and exterior work, water areas, insulation, seismic upgrades, and structural repairs can exceed 15 million to 30 million yen. We will first conduct an on-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 program. For example, the national “Mirai Eco Housing 2026 Project” requires that registered contractors (construction companies) apply. For seismic retrofitting and home modifications under the nursing care insurance in Ota Ward, the application is generally made by the individual. Additionally, while the Ota Ward housing renovation subsidy cannot be used for work done by Kakeru Koumuten due to location requirements for the construction company, we can provide information on necessary documents and procedures for other potentially available programs from the national government or Tokyo Metropolitan Government.
What risks are there if I leave a vacant house unattended?
Leaving a vacant house can lead to issues such as the progression of leaks and termite damage, depreciation of asset value due to deterioration of the exterior walls and roof, and neglect of garden trees and equipment. Furthermore, if the property is designated as a “poorly managed vacant house” or “specific vacant house” by the local government, there is a possibility that the special exemption for residential land from fixed asset tax may be revoked. Conducting an inspection early and performing necessary work according to your plans to live in, rent, sell, or utilize the property can ultimately help reduce costs.
I’m worried about seismic resistance. How can I assess the seismic resistance of a used detached house?
The construction period is a significant guideline. Let’s check if it was built after June 1981 (new seismic standards) and further after June 2000 (strengthening of joint and foundation regulations). For wooden houses built before these dates, we recommend a seismic diagnosis. Your municipality may also offer subsidies for seismic retrofitting of wooden houses, which can significantly reduce costs if you qualify (for details, see the above subsidy section). Kakeru Koumuten Co., Ltd. is here to assist you from diagnosis to renovation.
Will I need temporary housing during construction? How long will it take?
It depends on the scope of the work. For exterior renovations or partial interior work, it is often possible to carry out the work while staying in your home. However, for large-scale full renovations, we may recommend temporary housing. The estimated duration is about 2 to 4 weeks for exterior work and approximately 1 to 3 months or more for full renovations. We will provide you with a schedule in advance and propose a plan that minimizes the impact on your daily life.
Is Ota-ku within your service area? Will there be any travel fees?
Yes, Ota-ku is within the service area of Kakeru Koumuten Co., Ltd. Our headquarters is located in Aoba-ku, Yokohama, and we have five bases centered around Aoba-ku, Yokohama, covering a wide area in Kanagawa and Tokyo. Estimates are completely free, and we do not engage in aggressive sales tactics. Please feel free to consult with us first.
Leave your renovations in Ota-ku to Kakeru Koumuten Co., Ltd.!
“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 recommend unnecessary work and will carefully explain the reasons why work is needed.
We are confident in our cost, 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 outright.
See Kakeru Koumuten’s construction examples
See construction menu and price list
10Features of Ota-ku
Ota-ku, Tokyo, is located at the southernmost part of the 23 wards and serves as an international gateway with Haneda Airport. It is a town where quiet residential areas such as Denenchofu, Kugahara, and Yukigaya coexist with vibrant urban areas like Kamata and Omori.
In some areas of the ward, such as around Omori, Kamata, and Haneda, there are regions densely populated with wooden houses, making it important to review seismic, fire prevention, and insulation measures for older detached houses. Kakeru Koumuten Co., Ltd. is headquartered in Aoba-ku, Yokohama, and offers exterior and interior renovations across a wide area in Kanagawa and Tokyo. We can also handle exterior wall overlay methods with our own construction.
Service Areas for Renovation
Kakeru Koumuten Co., Ltd. accepts requests from a wide range of areas in Kanagawa Prefecture and Tokyo (consultation required depending on the area and type of work).
Service Area in Ota-ku, Tokyo (Main Areas)
Omori / Omori Nishi / Omori Higashi / Omori Kita / Omori Naka / Kamata / Nishi Kamata / Higashi Kamata / Minami Kamata / Den’en Chofu / Den’en Chofu Honcho / Yukigaya Otsuka-cho / Minami Yukigaya / Higashi Yukigaya / Kugahara / Ikegami / Magome / Naka Magome / Nishi Magome / Minami Magome / Kita Magome / Kojiya / Haneda / Higashi Kojiya / Yaguchi / Shimo Maruko / Unoki / Chidori / Sanno / Chuo / Naka Ikegami / Kami Ikedai and other areas throughout Ota-ku
・About Exterior Renovation in Ota-ku, Tokyo
・Case Study of Super Galtect Roof Overlay Method in Ota-ku
・Cost of Roof Overlay (Cover Method)
・Kakeru Koumuten’s Interior and Water-related Construction Achievements
・Wallpaper Replacement Work | From 50,000 yen for a 6-tatami room
・Cost of Bathroom Vanity Replacement Work
・Cost of Toilet Replacement Work
・Cost of Solar Panel and Battery Installation
・Methods and Costs for Leak Repair
・Non-Face-to-Face Estimate | Rough Estimate from Quotation or Blueprints
・Kakeru Koumuten’s Renovation Achievements Here!
・Kakeru Koumuten Co., Ltd. Construction Menu and Price List
・Reasons Why Kakeru Koumuten is Chosen Here!
・Kakeru Koumuten’s Warranty and Aftercare
・Company Overview of Kakeru Koumuten Co., Ltd.
・Kakeru Koumuten Co., Ltd. Staff Blog & Announcements
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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！
