[Minato-ku, Tokyo] Renovation of Vacant Houses and Used Properties | Cost Estimates, Subsidies, and Construction Achievements
For those considering renovations of used properties and vacant houses in Minato Ward
I bought a used property, but I’m not sure if the renovation estimate I received is reasonable.
This is my first full renovation, and I’m worried about making mistakes.
I want to make the most of subsidies and grants.
For such concerns, Kakeru Koumuten Co., Ltd., which serves the Minato Ward area, will clearly explain the points to consider when planning a renovation.
Let’s compare estimates from multiple companies
01Reasons for the Increase in Renovations of Used Properties and Vacant Houses in Minato Ward
Minato Ward in Tokyo is a town where residential areas such as Azabu, Shirokane, Takanawa, and Minami-Aoyama coexist with urban office districts. It is an area with a wide variety of building types and ages, from single-family homes to condominiums.
In older homes, updating facilities and reviewing seismic and insulation measures may be necessary. Therefore, purchasing a used single-family home or condominium and renovating (or renovating) it according to the building’s condition and lifestyle is an option.
Mix of Single-Family Homes and Condominiums
Since the age, structure, and management conditions vary by region and building, it is important to confirm the current situation before purchase or before construction begins.
Energy-Saving Subsidies from the Ward
Minato Ward has a subsidy system for solar power generation, storage batteries, high-insulation sashes, and high-reflectivity paints.
Seismic Reinforcement of Wooden Single-Family Homes
There are subsidy systems for seismic retrofitting work for wooden houses that meet certain conditions, depending on the timing of building confirmation.
Balancing Performance and Design
It is important to plan not only for the appearance of the interior and exterior but also for seismic resistance, thermal insulation, waterproofing, and future maintenance.
In this article, we summarize the reasons, points of caution, cost estimates, the latest subsidies for 2026, and how to choose contractors from the perspective of Kakeru Koumuten, aimed at helping those considering renovating used properties and vacant houses in Minato Ward to avoid “failure”.
Let’s Compare Estimates with Consistent Conditions
When renovating, it is essential to compare estimates from multiple companies. Ensure that the scope of work, materials used, processes, and warranty conditions are consistent, and check not only the prices but also the clarity of the proposals and explanations. Kakeru Koumuten is also available for consultations regarding renovations of vacant houses and used properties in Minato Ward.
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 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
A common reason for purchasing and renovating a used property is “to live comfortably.” Older homes may have issues with the roof, exterior walls, or plumbing, making them difficult to live in as they are. By renovating and updating the facilities and interior, you can create a comfortable living environment. Additionally, by changing the layout and refreshing the interior, you can aim for a home that fits your family’s lifestyle while keeping track of the total costs, including the purchase price and renovation expenses.
Reason 2 To Increase Asset Value for Sale
There is also the option to renovate a used property before selling it. Improving the interior and exterior as well as the facilities can enhance the property’s impression and usability, but it is not guaranteed that the renovation costs can be directly added to the selling price. It is essential to check the surrounding market and the needs of potential buyers when considering the scope of work.
Reason 3 To Utilize as an Investment or Business
For properties intended for investment or business purposes, renovations tailored to the intended use and tenant demographics can help differentiate them from other properties. However, a financial plan that includes renovation costs, maintenance costs, and vacancy risks is necessary. Subsidies and tax incentives vary depending on the target audience, building use, and scope of work, so it is important to confirm these before starting construction.
03Points to Note 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 in line with your wishes, the structure of the house, and the surrounding environment, and who also provides aftercare following the construction.
Point 2 Always Check the Deterioration of the Building
For used properties and vacant houses, it is crucial to confirm which parts have deteriorated and to what extent beforehand. Since other people have lived there before, the internal damage is often not apparent without investigation. Make 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 houses 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 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, supporting part of the costs for earthquake retrofitting, energy-saving construction, and barrier-free renovations. There are tax deductions available for “housing loan tax deductions” when using a housing loan, as well as systems that allow for deductions on certain construction costs even with personal funds. These can sometimes be used in combination, so it is crucial 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 based on the extent of damage and the scope of work. First, please familiarize yourself with the approximate costs by area to serve as a guideline for your financial planning (the table below provides general estimates for typical single-family homes. The interior is based on a single 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 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 one car, including concrete pouring, etc.) | Approximately 200,000 to 600,000 yen |
*The above are general estimates only. Costs may vary depending on the presence of scaffolding, the condition, grade, and area of the building. Waterproofing of the roof and updates to the plumbing and wiring of the entire house may exceed the above estimates depending on the area and method used. 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 Minato Ward
One way to carry out renovations on used properties or vacant houses at a lower cost is to utilize the subsidy and grant system. As of 2026, we have summarized the main systems that residents of Minato Ward may be able to use.
*The following information is as of September 1, 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 relevant offices for the latest information before applying. Kakeru Koumuten can assist with confirming the systems and providing necessary documents, but the application methods and applicants may differ depending on the system.
National Program: Housing Energy Saving 2026 Campaign
The government is implementing multiple subsidy programs 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 is a successor to the “Child-Rearing Green Housing Support Project.” Among the required works, a specified combination including openings must be implemented, and eco-friendly housing equipment, child-rearing compatible renovations, disaster prevention improvements, and barrier-free renovations may also be eligible.
Subsidy upper limit guidelines: For houses built before 1991, up to 1 million yen per unit (50,000 yen depending on the construction content); for houses built from 1992 to 2016, up to 800,000 yen per unit (400,000 yen for the same). Eligible works 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 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 through registered contractors.
Window insulation renovations such as installing inner windows, replacing outer 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.
The subsidy amount varies based on the window method, performance, size, and construction style of the 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 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 through 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.
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 works 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).
Tokyo Metropolitan Program
High insulation windows (installation of inner windows, replacement of outer windows, glass replacement), high insulation doors, insulation materials, and high insulation bathtubs are eligible. This program offers a significant subsidy amount that can greatly enhance the insulation performance of existing homes.
High 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 cap of 1 million yen, and high 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 the city are eligible. The program is managed by Cool Net Tokyo. For more details, visit the official page.
This system provides discounts equivalent to Tokyo Zero Emission Points when purchasing eligible air conditioners, refrigerators, water heaters, and LED lighting fixtures at registered retailers, depending on certain conditions.
The eligible products, discount amounts, and replacement conditions vary based on item type and energy-saving performance. Please check the latest conditions with the registered retailer and on the official page before making a purchase.
This system supports the introduction of household storage batteries in residential properties within the city. The subsidy details may vary depending on conditions such as when installed alongside solar power generation equipment.
The basic subsidy is 100,000 yen per 1 kWh of storage capacity, with a maximum of 1.2 million yen per unit. Please check the eligible devices, application timing, and combined conditions on the official page.
Minato Ward Programs
This program subsidizes part of the installation costs for eligible equipment such as solar power generation systems, household storage systems, high insulation sashes, and high reflectance coatings.
For solar power, the maximum output kW × 100,000 yen, with a cap of 400,000 yen; for storage batteries, initial effective capacity kWh × 40,000 yen, with a cap of 200,000 yen; for high insulation sashes, one-fourth of installation costs, with a cap of 100,000 yen; and for high reflectance coatings, the lower amount of material costs or construction area m² × 2,000 yen, with a cap of 300,000 yen. High reflectance coatings apply to roofs and rooftops, while exterior walls and waterproofing work are not eligible. The application period is from April 1, 2026, to January 29, 2027, and the completion report must be submitted by February 26, 2027, with pre-application required before starting work. For more details, visit the official page of Minato Ward.
For wooden houses that meet certain conditions, a portion of the costs for earthquake resistance renovation work will be subsidized based on the timing of the building confirmation.
Houses that received building confirmation between June 1, 1981, and May 31, 2000, are eligible for half of the construction costs, with a maximum of 1 million yen. Houses that received building confirmation before May 31, 1981, are eligible for two-thirds of the construction costs, with a maximum of 4 million yen. Projects that have already been contracted or started are not eligible, and prior consultation before application is required. Earthquake diagnosis is covered under a separate system, with subsidies available for wooden houses and boarding houses covering two-thirds of the costs, with a maximum of 200,000 yen. For details, please visit the official Minato Ward page.
This system is for individuals aged 65 and over who are recognized as needing housing renovations due to difficulties in daily life. The applicable system varies depending on the certification status of support or long-term care needs.
Preventive benefits are capped at 200,000 yen and do not apply to those certified for support or long-term care. Equipment benefits include a bathtub replacement of 379,000 yen, sink and washbasin of 156,000 yen, and toilet modernization of 106,000 yen as maximums. Small-scale housing renovations for those certified for support or long-term care will utilize long-term care insurance. There is a self-burden based on income, and renovations due to new installations, breakdowns, aging, or regular remodeling are not eligible. After application, a visit and survey by a housing renovation coordinator will take place. For details, please visit the official Minato Ward page.
* Minato Ward also has a system to support the removal of dangerous block walls and the installation of new walls. If it is determined that earthquake resistance is necessary by the ward’s earthquake resistance advisor, the removal costs will be fully covered, up to 1.5 million yen, and the installation costs for new walls will be two-thirds covered, up to 1 million yen. Since procedures are required before contracting or starting work, please check the official Minato Ward page for more information. As of September 1, 2026, there was no confirmation of a general subsidy system unique to Minato Ward that targets the renovation of vacant houses.
See also about renovation tax reductions and other systems
- Housing Loan Tax Reduction: If you use a housing loan for renovations that meet certain requirements, income tax 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, 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 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 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 systems 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)!
Roof Overlay Construction Case in Minato-ku
| Construction Location | Minato-ku, Tokyo |
|---|---|
| Construction Content | Roof Overlay Construction |
| Existing Roofing Material | Slate |
| New Materials Used | Sekino Kousan Danetsu Top |
| Price Range | 600,000 – 700,000 yen |
Our Proposal
We implemented a roof overlay method by installing a new waterproof sheet and Danetsu Top over the existing slate roof without removing it. This method minimizes the area of the existing roof that needs to be removed; however, depending on the condition of the substrate, re-roofing may be more suitable, so prior inspection is important.
▶ Roof renovations in Minato Ward can be found here
See examples of roof overlay and re-roofing work with Dan Netsu Top
07How to Choose a Renovation Contractor for Used Properties and Vacant Houses in Minato Ward
There are many renovation companies that serve Minato Ward, 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 after-sales maintenance
- Obtain estimates from multiple contractors
- Confirm whether they perform renovations in-house
- Check if they offer color simulations and perspective drawings
1. Experience in renovation work
Many renovation contractors publish their work results on their websites. If a contractor provides detailed explanations of the process with photos, it can help you visualize the outcome after the project, giving you peace of mind. If you have concerns, choose a contractor with extensive experience.
Google and review sites can also be helpful. It’s important to check the content of low ratings, the company’s responses, and the timing of the posts. While Google reviews are useful, do not make your decision based solely on reviews; consider the work results, estimates, and warranty details for a comprehensive assessment.
2. Check for warranties and after-sales maintenance
When choosing a contractor, be sure to check for warranties. If repairs are needed within the warranty period, they may be done for free. The duration varies by contractor and paint type, but typically ranges from 1 to 10 years (emergency repairs and partial fixes are often not covered). Some contractors also offer after-sales services in addition to warranties, so be sure to check for those as well.
Kakeru Koumuten Co., Ltd. provides a construction guarantee for eligible exterior renovations and sealing work. The presence, duration, and scope of the guarantee vary depending on the type of work and materials used, so please check the details of the guarantee before signing the contract. You can also consult us about aftercare maintenance.
For more details on Kakeru Koumuten’s guarantees and aftercare maintenance, click here
3. Obtain estimates from multiple contractors
When requesting renovations, be sure to obtain estimates from multiple contractors. Even for the same work, guarantees, after-sales services, and prices can vary significantly. Having multiple estimates makes it easier to negotiate prices.
When comparing estimates, it is important to look closely at not just the costs, but also the “items in the estimate,” “check the undercoating materials, sealing materials, and paint for auxiliary parts,” and “confirm the process.” Lowering the rank of auxiliary parts or skipping steps can reduce costs, so it is essential to not make decisions based solely on price.
For more details on points to compare 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,” “base materials,” “desired durability,” and “design” to propose the best 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 work details and has clear responsibilities for quality control and guarantees. If the work is done in-house, it is easier to coordinate with the site, allowing for quicker responses in case of any issues.
5. Check if they offer color simulations and perspective drawings
Choosing colors and 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 Minato-ku
Kakeru Koumuten Co., Ltd. serves the Minato Ward area,
providing proposals tailored to the condition of vacant homes and used properties based on your preferences
.
For renovations in Minato Ward, we consider the balance of “cost,” “quality,” and “plan” based on the condition of the building, budget, and desired durability. Please feel free to compare with estimates from other companies.
When obtaining multiple estimates, let’s compare not only the prices but also the scope of work, materials, processes, and guarantees.
1. Equipment Specialized for In-House Renovations
Kakeru Koumuten Co., Ltd. has organized warehouses and material storage areas to ensure smooth progress of construction. We utilize our showroom in Aoba-ku, Yokohama, our Machida store in Machida City, and three material storage areas in Aoba-ku and Asahi-ku, Yokohama.
In-House Scaffolding Materials
We can construct the temporary scaffolding required for exterior renovations using our own scaffolding materials and in-house scaffolding team. By not outsourcing, this leads to cost reductions in scaffolding work. We own scaffolding materials for approximately 50 single-family homes.
Storage of Materials in Our Large In-House Warehouse
We store roofing materials, paints, and auxiliary materials according to the construction content. By managing the necessary materials and equipment in-house, we have established a system that makes it easy to arrange for them according to the site conditions. We are also equipped with various tools to handle different types of construction, such as compressors and washing machines.
In-house waste separation
In exterior renovations, various types of waste such as paint, wood, and metal are generated. Our company separates waste by type and recycles or disposes of it in accordance with laws and processing methods.
Exterior renovation dedicated showroom
In the showroom, you can not only have meetings but also check the actual paint colors and a wide range of catalogs. You can also confirm heat insulation properties using color simulation and heat insulation paint testing equipment. The showroom is a 3-minute walk from Eda Station in Aoba-ku, Yokohama, and is accessible from Tokyo as well.
2. In-house construction system focused on exterior work
Kakeru Koumuten Co., Ltd. has established an in-house construction system focusing on exterior work such as temporary scaffolding, roof construction, and exterior painting. From inquiries to construction management, we collaborate internally, making it easy to share information about the construction details and site conditions. Depending on the nature of the work, such as interior and equipment installations, we may collaborate with partner companies, and we will explain the construction system during the estimate. We also welcome competitive estimates.
3. Acquisition of 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, giving us confidence in our construction techniques. We are capable of handling large-scale painting projects for factories and apartment complexes.
4. Warranty and Aftercare Maintenance
We provide construction warranties for applicable works such as exterior painting and joint sealing. The warranty period and coverage vary depending on the nature of the work and the materials used. We also offer aftercare maintenance, so please click the image above for more details.
5. Flexible and Prompt Response
We are equipped to handle various exterior troubles and situations. If we cannot access the roof at high altitudes, 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 repairs for sudden leaks from exterior walls.
6. Human Resource Development
We create various models for skill enhancement 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 achieve satisfaction with their important building renovations by fully assisting in color selection and design for both exterior and interior projects.
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 propose several patterns with our recommended color schemes. We also accommodate “test painting” and “arranging paint boards” to confirm actual color tones.
7-2. Interior Renovation Simulation
We also support simulations and perspective drawings for interior renovations. Based on your preferred style, such as modern, we can suggest recommended simulations. We create realistic perspectives based on actual floor plans.
8. We also handle solar panel and battery installation work!
As more customers are introducing solar equipment with generous 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 accept requests for estimates and the creation of power generation simulations only.
09 Renovation of Used Properties and Vacant Houses in Minato-ku | Frequently Asked Questions
We answer the most frequently asked questions from those considering renovations of used properties and vacant houses in Minato-ku.
Is it better to renovate after buying a used property or to consult before purchasing?
If possible, please consult with 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 cases where “unexpected construction costs arose” after the purchase. By having Kakeru Koumuten check the condition of the property you are considering and provide an estimate for necessary renovations in advance, you can establish a feasible financial plan.
What renovations should be prioritized for a used house in Minato-ku?
It depends on the condition of the building, but 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 renovations for the roof and exterior walls, water areas (kitchen, bathroom, toilet), and insulation based on your budget and impact on your daily life. The areas of deterioration vary depending on the age of the building and its repair history, so we recommend starting with a comprehensive inspection of the entire building, including the exterior.
I want to improve the performance of a used house in Minato-ku. What subsidies are available?
In Minato-ku, there are subsidies such as up to 1 million yen for solar power generation (maximum output kW × 100,000 yen, capped at 400,000 yen), up to 300,000 yen for high-reflectivity paint (roof and rooftop), and up to 100,000 yen for high-insulation sashes. Each has eligibility requirements, and applications must be submitted before construction begins. For seismic retrofitting of wooden houses, the cap can be 1 million yen or 4 million yen depending on the timing of the building confirmation. For more details, please check the subsidy section above.
How much does a full renovation (full remodeling) cost?
The cost of a full renovation for a detached house varies greatly depending on the area, condition of deterioration, scope of work, and grade of equipment. Even if focusing on interior and equipment updates, it typically starts from around 8 million yen, while large-scale renovations that include exterior, water areas, insulation, and seismic upgrades can exceed 15 million to 30 million yen. First, we will conduct a site survey to check the condition and propose a prioritized plan that fits your budget.
Do I apply for subsidies myself? Is the process difficult?
The applicant varies depending on the system. For example, the national “Mirai Eco Housing 2026 Project” is a system where registered contractors (construction companies) apply. For seismic retrofitting or housing renovations under long-term care insurance in your municipality, the application is generally made by the individual, 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?
Leaving a vacant house can lead to issues such as the progression of leaks and termite damage, a decrease in asset value due to deterioration of the exterior walls and roof, 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 tax exemption for residential land will be revoked. Early inspections and necessary renovations based on your plans to live in, rent, sell, or utilize the property can ultimately help reduce costs.
I am worried about seismic resistance. How can I assess the seismic resistance of a used 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 this, we recommend a seismic diagnosis. Your municipality may also have 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 a schedule in advance and propose a plan that minimizes the impact on your daily life.
Is Minato-ku within your service area? Will there be any travel fees?
Yes, Minato-ku is within the service area of Kakeru Koumuten Co., Ltd. Our headquarters and showroom are located in Aoba-ku, Yokohama, and we utilize our store in Machida City, Tokyo, and a material storage site in Yokohama to serve sites in Kanagawa Prefecture and Tokyo. The costs for on-site surveys and estimates, as well as the feasibility of service, will be provided after confirming your request details and location.
Leave your renovations in Minato-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 check your specific requests and the condition of your building, and propose a plan that organizes necessity and priorities.
We will clearly explain the scope of work, materials used, schedule, and warranty details. We also welcome comparative estimates.
Get a free estimate and consultation here
Please review the details and consider them after you are satisfied.
See Kakeru Koumuten’s case studies
See our service menu and price list
10Characteristics of Minato-ku
Minato-ku, Tokyo, is a town where residential areas such as Azabu, Shirokane, Takanawa, and Minami-Aoyama coexist with urban office districts. The types of buildings and their ages vary by region, including single-family homes, apartments, and commercial buildings.
For older homes, it may be necessary to update facilities and review seismic, insulation, and waterproofing performance. Kakeru Koumuten Co., Ltd. is headquartered in Aoba-ku, Yokohama, and focuses on exterior work such as roofing and wall construction in Minato-ku, while collaborating with partner companies for interior and facility work as needed.
Areas where renovations can be accommodated
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.
Minato-ku, Tokyo Service Area (Main Regions)
Akasaka / Azabu-Juban / Azabudai / Azabu Nagasaka-cho / Azabu Tanukikoji / Atago / Kaigan / Kita-Aoyama / Konan / Shiba / Shibaura / Shiba Park / Shiba Daimon / Shirokane / Shirokanedai / Shinbashi / Odaiba / Takanawa / Toranomon / Nishi-Azabu / Nishi-Shinbashi / Hamamatsucho / Higashi-Azabu / Higashi-Shinbashi / Mita / Minami-Aoyama / Minami-Azabu / Moto-Akasaka / Moto-Azabu / Roppongi
・Roof Renovation in Minato-ku, Tokyo
・Exterior Renovation in Minato-ku, Tokyo
・Exterior Painting in Minato-ku, Tokyo
・Exterior Cover Work in Minato-ku, Tokyo
・Leak Repair in Minato-ku, Tokyo
・Waterproofing Work in Minato-ku, Tokyo
・Rain Gutter Repair and Cleaning in Minato-ku, Tokyo
・Solar Panel Installation Work in Minato-ku, Tokyo
・Exterior Cleaning in Minato-ku, Tokyo
・Kakeru Koumuten Co., Ltd. Project Examples
・Construction Menu and Price List
・Reasons to Choose Kakeru Koumuten
・Guarantee and Aftercare
・Company Overview of 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!
