Leave Your Solar Panel Installation Work in Machida City, Tokyo to Kakeru Koumuten Co., Ltd.!
For solar panel and battery installation in
Machida City, Tokyo,
trust Kakeru Koumuten!
Kakeru Koumuten is a company specializing in exterior renovations.
As a strong player in roofing, we are entrusted withsolar panel and battery installation considering roofs and waterproofing!
“How to Choose a Solar Panel Contractor in Machida City, Tokyo”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Machida City, Tokyo”
We will also explain the above three points!
Installing solar panels carries risks such as“the occurrence of leaks” and other troubles.
To ensure you have no regrets about your solar panel installation, we recommend obtainingquotes from about three companies!
Table of Contents (tap to open/close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Machida City, Tokyo
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Machida City, Tokyo
- Price List for Solar Panel and Storage Battery Installation
- Breakdown of Installation Capacity, Equipment, and Construction Costs
- Self-Estimate and Profit Simulation for Solar Power Generation
- Customer Testimonials
- Case Studies of Solar Panel Installations
- How to Choose a Solar Panel Installation Contractor in Machida City, Tokyo
- Benefits of Introducing Solar Equipment
- Points to Consider When Introducing Solar Power Generation
- How to Choose Solar Panels
- Frequently Asked Questions About Solar and Storage Battery Installation in Machida City, Tokyo
- If You Are Looking for a Solar Panel Installation Contractor in Machida City, Tokyo, Contact Kakeru Koumuten
- Characteristics of Machida City, Tokyo and Points for Solar Installation
- Service Area in Machida City, Tokyo
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Machida City, Tokyo
Regarding why we are entrusted with solar panel installation by customers in Machida City, Tokyo,
“Our Unique Strengths in Solar Panel Installation That Cannot Be Imitated by Other Companies”
have received high praise from many customers.
so we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome multiple estimates!
1. We Also Handle Exterior Renovations Beyond Solar Panel Installation!
Issues such as leaks that occur with solar panel installations may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if one is knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside their expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance and issues after installation!
Kakeru Koumuten is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent issues after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten has prepared the following warehouses and material storage to provide solar work and exterior renovations at low cost and high quality.
We have established five bases for material storage and showrooms.
In-house Ownership of Scaffolding Materials
To ensure safety during work on the roof, we own the scaffolding materials necessary for temporary scaffolding based on construction conditions and can assemble scaffolding in-house.
By not outsourcing scaffolding work and performing it with our own scaffolding team, we can also cut costs related to scaffolding construction.
We own scaffolding materials for approximately 50 detached houses!
Even if there are height differences on the site, our in-house scaffolding team will plan the scaffolding according to the local conditions.
Storage of Materials in Our Large Warehouse
We store roofing materials and paints, and we can also store removed solar panels.
By ordering a large quantity of materials at once, you canpurchase materials at a lower cost!
Additionally, we always have roofing materials in stock, so we can provideswift responses in emergencies!
Sorting and Transporting Waste Materials In-House
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut waste disposal costs.
Exterior Renovation Dedicated Showroom
In the showroom, you can not only have meetings but also
check the actual mounting brackets for solar panels and see how they are installed on roofing materials!
Simulations for potential earnings and installation costs when introducing solar panels are also available!
Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that explain the structure in detail!
3.All Work Performed by Our Own Team
One of Kakeru Koumuten’s major strengths is its complete in-house construction.
By having a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof renovations at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the担当者 does not change, smooth communication is possible.
We can provide consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry permits as well as permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians, and we are confident in our construction techniques.
We can also handle large-scale roof projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation work, we also provide our own施工保証 (leak warranty)!
(The施工保証 for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless a roof renovation is performed. The施工保証 is separate from the manufacturer’s product warranty, and the scope and conditions vary based on the warranty details.)
Aftercare is available annually, and we send out notification DM every year.
If you have any questions about the warranty, please click on the image above!
6. Flexible and Prompt Response
Our company is equipped to handle various roofing troubles and situations.
If you cannot access the roof at high altitudes, we can utilize a drone to assist!
During leak investigations, we can also conduct inspections using a thermal imaging camera.
If the power generation of the solar panels decreases due to dirt, we can perform cleaning with a specialized brush.
We will respond according to your preferences.
7. Human Resource Development
To improve skills, we create various roof models and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training so that each staff member can handle various cases.
8. Creation of Easy-to-Understand Materials and Simulations
Kakeru Koumuten provides “estimates,” “layout diagrams,” and “power generation simulations”, as well as “Solar Construction Guidebook” and “profit and loss simulations” that take into account loan interest rates and electricity costs.
Profit and loss simulations can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar construction can have the key points and disadvantages summarized in an easy-to-understand manner!
We encourage you to obtain comparative estimates and compare them with other companies’ plans!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 or 30 years.
Confirming “Is it okay to install directly on the current roof?” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Year of Construction | The fixing method varies depending on the roofing materials such as slate, tiles, metal roofs, and flat roofs (rooftop waterproofing). If the remaining lifespan of the roofing material is short, we may suggest roof renovation first. |
| 2. Condition of the Substrate and Waterproof Sheet | If the sheathing boards or roofing (waterproof sheet) under the roofing material are damaged, it will affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 3. Orientation, Slope, and Shadows of the Roof | The orientation and slope of the roof surface, as well as shadows from neighboring houses, trees, and utility poles, will affect the power generation. We will create a layout diagram from the drawings and on-site, and you can check it with a power generation simulation. |
| 4. Shape of the Roof and Usable Area | The number of panels that can be installed (installation capacity) is determined by the shape and size of the roof. The number of panels that can be installed varies depending on the size of the panels, so we will compare based on the total output of the roof. |
| 5. Fixing Method and Waterproofing Details | We will check whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The fixing method varies by technique, so please confirm the waterproof treatment method for the fixing parts during the estimate. |
| 6. Weight of the Roof | The roof will become heavier due to the panels being installed. After investigating the existing roof, substrate, and load-bearing capacity, switching to lighter roofing materials may also be an option if necessary. |
| 7. Installation Location of Equipment and Wiring | We will confirm the installation locations for the power conditioner and storage battery, as well as the wiring route to the distribution board. The length of the wiring will also affect the cost. |
| 8. Ease of Scaffolding Setup and Delivery Routes | If there are elevation differences on the site, planning for scaffolding and the delivery routes for equipment and materials may require some ingenuity. The width of the front road and any steps on the site will also be checked during the on-site investigation. |
Fixing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets to roof material and substrate with screws) | Waterproofing treatment of fixed parts, cracks or deterioration of slate, condition of substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suited to the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be methods to replace with lighter roofing materials before installation. |
| Metal Roof (Horizontal/Vertical) | Fixed with catch-type brackets that grip the roofing material (depends on the combination of roofing material and brackets) | Whether the roofing material and brackets are compatible, installation conditions from the roofing material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a frame | Type and deterioration status of the waterproof layer, waterproofing around the frame. Consider in conjunction with the timing of waterproofing work. |
If you plan to renovate the roof 10 to 20 years after installation, there will be additional costs for the removal and reinstallation of solar panels. If the roof is deteriorating, it may be more cost-effective in the long run to renovate to a highly durable roofing material before installation.
Kakeru Koumuten Co., Ltd. specializes in roofing work and can also handle the removal and reinstallation of solar panels in-house, so please consult us based on the condition of your roof!
▶ Click here for roof renovations in Machida City, Tokyo
Possible Subsidies and Grants in Machida City, Tokyo
If you are introducing solar panels or storage batteries in Machida City, Tokyo, there is a possibility that the “National” and “Tokyo Metropolitan” systems may apply. According to the official page of Machida City, the city’s unique solar power generation subsidy program ended in 2016, and information on the national and Tokyo Metropolitan systems is provided.
Below is the information confirmed on the official pages of each system as of October 7, 2026. The acceptance status may change depending on the budget, so please check the latest information before contracting or starting work.
Eligibility Conditions and Application Timing for Subsidy Programs
| Program | Main Eligibility Conditions | Subsidy Amount | Application Period & Status |
|---|---|---|---|
| Tokyo “Home Solar Power Introduction Promotion Project” | Individuals, corporations, or management associations installing unused solar power systems (output less than 50kW, JET certification, etc.) in residential properties within Tokyo. The generated power must be used in the residential part. Pre-application is required | Existing homes: 15,000 JPY per kW for 3.75 kW or less (maximum 450,000 JPY), 12,000 JPY per kW for over 3.75 kW to less than 50 kW New homes: 12,000 JPY per kW for 3.6 kW or less (maximum 360,000 JPY), 10,000 JPY per kW for over 3.6 kW |
For the fiscal year 2026, pre-applications are being accepted from May 29 (ends when the budget is reached). From the pre-application for fiscal year 2026, submission of certificates issued by financial institutions is required at the time of performance reporting. |
| Tokyo “Home Storage Battery Introduction Promotion Project” | Owners of eligible equipment (storage batteries registered with SII) excluding national and local governments. Must be installed between April 1, 2026, and March 30, 2027. If applying after October 1, 2026, only products registered with the national SII for fiscal year 2026 are eligible | Storage battery package: 100,000 JPY per kWh (maximum 1,200,000 JPY per household) Additional for participating in DR demonstration (100,000 JPY per unit; 150,000 JPY per unit if energy management equipment is installed) Expansion of storage battery units: 60,000 JPY per kWh (maximum 720,000 JPY per household) |
For the fiscal year 2026, pre-applications are being accepted from May 29. Grant applications and performance reports will be accepted from June 30. |
| National “DR Home Storage Battery Project” (Fiscal Year 2025 Supplement) | Newly introducing home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on an initial effective capacity of 34,500 JPY per kWh (subsidy rate within 30% and a maximum of 600,000 JPY per application). | The budget was reached on May 29, 2026, and the public recruitment has ended (there are no plans to reopen public recruitment as stated on the official website, and applications cannot be made at this time). |
| National “Mirai Eco Housing 2026 Project” (Renovation) | Storage batteries are one of the eligible facilities, but they must be combined with essential works such as insulation renovations of windows (openings) and structures; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities | Storage battery: 96,000 JPY per household | Ends when the budget limit is reached. As of October 5, 2026, the application amount for renovations is displayed as 8% of the budget on the official website. Please check the official site for the application status. |
The Tokyo solar power and storage battery subsidies require pre-application. For storage batteries applied for after October 1, 2026, only national SII registered products will be eligible, and the equipment requirements will change. According to the official page of Machida City, the city’s own solar power subsidy project ended in 2016, and the national and Tokyo programs are being guided. Eligibility conditions, application procedures, and the possibility of combining programs differ by program, and applying does not guarantee a grant, so please confirm before contracting or starting work.
Kakeru Koumuten Co., Ltd. will guide you on the eligibility conditions and application periods for each program after confirming them.
National Subsidy “DR Home Battery Project (Support Project for Introducing Home Storage Systems for DR Resource Implementation)”
The government has been implementing the “DR Home Battery Project” to support the installation of home storage batteries.
This program targets those who are introducing new registered storage systems that can be utilized for demand response (DR), and for the fiscal year 2025, the subsidy amount is determined based on a standard amount of 34,500 JPY per initial effective capacity of 1 kWh, with a subsidy rate of up to 30% and a maximum limit of 600,000 JPY per application. There are also conditions such as excluding contracts or orders made before the grant decision.
However, the application amount for the fiscal year 2025 reached the budget on May 29, 2026, and the public recruitment has ended. The official site also states that there are no plans to resume public recruitment, and applications are currently not possible. Please check the official site for future public recruitment.
Additionally, there are currently no subsidies confirmed for the installation of solar panels on existing homes.
👉 Click here for the official site of the DR Home Battery Project
Tokyo “Promotion Project for Introducing Solar Power Generation in Homes”
This subsidy is for those who are installing unused solar power generation systems in residential homes within Tokyo. The simultaneous installation of storage batteries is not a condition.
●Existing homes: For systems under 3.75 kW, 150,000 JPY per kW (maximum 450,000 JPY); for systems over 3.75 kW and under 50 kW, 120,000 JPY per kW
●New homes: For systems under 3.6 kW, 120,000 JPY per kW (maximum 360,000 JPY); for systems over 3.6 kW and under 50 kW, 100,000 JPY per kW
●Additional costs for installing rooftop frames and waterproofing work are also included
The target is to install unused panels with an output of less than 50 kW that have obtained JET certification, for use in the residential part of homes in Tokyo. The process involves pre-application followed by a grant application after installation, and starting from the pre-application for the fiscal year 2026, submission of certificates issued by financial institutions during the performance report is mandatory.
According to the official page of Tokyo, pre-applications are being accepted from May 29, 2026. The program will end once the budget is reached, so please check the official page for the status of applications.
👉 Click here for the official page of Tokyo (Cool Net Tokyo)
Tokyo “Promotion Project for Introducing Storage Batteries in Homes”
This subsidy is for the installation costs of storage battery systems aimed at increasing self-consumption of electricity generated by solar power and enhancing energy independence during emergencies.
●Storage battery package: 100,000 JPY per kWh (maximum 1,200,000 JPY per household)
●Additional for participating in DR verification: 100,000 JPY per unit (150,000 JPY per unit if energy management equipment is installed)
●Expansion of storage battery units: 60,000 JPY per kWh (maximum 720,000 JPY per household)
The target is the owner of the subsidized equipment (excluding national and local public organizations), and it is a condition that the installation is done between April 1, 2026, and March 30, 2027. If you apply in advance after October 1, 2026, only the products registered in the national SII for the fiscal year 2026 will be eligible.
According to the official page of Tokyo, pre-applications have been accepted since May 29, 2026. For detailed information such as conditions for combination with solar power generation, please check the official page.
👉 Here is the official page of Tokyo (Cool Net Tokyo)
About the Subsidy System in Machida City
The official page of Machida City states, “We support solar power generation systems, etc.,” that the city’s subsidy project for residential natural energy utilization equipment ended in 2016, and currently, no unique subsidies are being provided by the city. Information about national and Tokyo subsidies is available on the city’s official page. For residential solar power generation and storage batteries, the above-mentioned systems from Tokyo and the national government are the main focus. The system may change, so please check the latest information before signing a contract.
👉 Here is the official page of Machida City
Additionally, Machida City offers a subsidy of 35,000 yen for household fuel cell systems (Enefarm) as part of the “Next Generation Energy Promotion Project Subsidy.” The application period for fiscal year 2026 is stated to be from June 15, 2026, to September 30, 2026 (must arrive by this date), and as of October 7, 2026, the application period has passed. Solar power generation and storage batteries are not included.
👉 Here is the information on the subsidy system related to global warming measures in Machida City
Furthermore, Machida City is calling for caution against “malicious door-to-door sales of solar power generation systems impersonating city employees.” For door-to-door sales that mention subsidies, it is recommended to obtain estimates from multiple companies and verify with the official pages of the city and Tokyo.
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | Click here for costs related to Solar Panel Removal and Hot Water Heater Dismantling
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and storage batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs”.
Even for the same “Complete Solar Panel Installation,” the amount can vary greatly depending on the installation capacity, equipment grade, and roof condition.
Understanding Installation Capacity (kW) and Battery Capacity (kWh)
The installation capacity of solar panels is determined by “Output of One Panel (W) × Number of Panels”, with the unit being kW (kilowatts). Storage batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hours).
The amount of kW that can be placed on the roof varies for each house depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panel costs as approximately 800,000 JPY to 1,200,000 JPY for 3-5 kW and 1,200,000 JPY to 1,900,000 JPY for 6-10 kW. (These are just rough estimates and can vary based on wiring length, scaffold range, existing roofing materials, panel layout, etc.)
▶ Service Menu | Click here for costs related to Solar Panel Installation and Storage Battery Installation
Items to Confirm in the Estimate (Cost Verification)
When comparing estimates, it is common to compare different capacities and equipment by only looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW) should be specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also check if it is a type that controls the battery together. |
| 3. Battery | Manufacturer, model number, capacity (kWh), range usable during a power outage (whole house or specific circuits), installation location. |
| 4. Mounting Frame and Hardware | Name of the hardware suitable for the roofing material and the method of securing it (whether it involves drilling holes or using clamps). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, presence of a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at fixed points, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | Extent of support for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roof work and exterior painting are done simultaneously, check that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar water heaters and old panels, as well as disposal costs for waste materials, are included. |
| 10. Tax Classification and Warranty | Whether prices are tax-inclusive or tax-exclusive, conditions under which additional costs may arise, and details and duration of manufacturer and workmanship warranties. |
If the capacity differs, both the price and power generation will change. Kakeru Koumuten Co., Ltd. warmly welcomes competitive estimates, so if you bring estimates from other companies, we will explain the differences by item!
Self-Estimate and Profit and Loss Simulator for Solar Power Generation
With the simulator above,
you can obtain an approximate estimate and a profit and loss simulation up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the battery, you can get an approximate estimate and profit and loss simulation!
*The simulation results are approximate. Actual profits and losses may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection and replacement.
Customer 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)!
Case Studies of Solar Panel Installation
| Work Details |
| Solar Panel Installation Battery Installation |
| Existing Roofing Material |
| Horizontal Metal Roof (Super Galtect) |
| Installation Capacity |
| Solar Panel: 4.3kW Battery: 5kWh |
| Base Mounting Hardware Used |
| Niigata Manufacturing/Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed using catch type hardware gripping the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY *Due to the grant, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The grant amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| Approximately 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that grants are available, and I would like to know how much will be provided. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels from the drawings!
The layout diagram shows the arrangement of solar panels when placed on the roof.
Since we can also determine the installation capacity, it allows for power generation simulations and financial simulations.
We have also understood the expected amount of grants, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Machida City, Tokyo
There are many solar panel installation contractors available in Machida City, Tokyo, and you may be unsure which contractor to choose.
For this reason,when requesting solar panel installation or battery storage installation work, be sure to check the following four points.
● Have extensive knowledge not only about solar panels but also about roofs
● Confirm the presence of warranties and aftercare services
● Obtain estimates from multiple contractors (three companies is a guideline)
● Check if they provide support for subsidy applications
By confirming the above four points, you will be able to choose a reliable contractor.
Have knowledge not only about solar panels but also about roofs
Defective installation of solar panels can sometimes be caused by a lack of knowledge and verification regarding roofs and waterproofing.
While knowledge about solar panels is certainly important, understanding the roof and waterproofing at the installation site of the solar panels is also crucial.
⚠︎Examples of troubles caused by insufficient verification of roofs and waterproofing
・Solar panels were installed on a deteriorated roof, resulting in leaks
・Solar panels were installed on a roof with a short lifespan, necessitating a renovation for removal and reinstallation within a few years
・Misjudgment of the type of waterproofing led to incorrect processing and subsequent leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows you to avoid unnecessary expenses and unexpected troubles.
▶ Go to “Roof Verification Before Installing Solar Panels” in this article
Confirm the presence of warranties and aftercare services
When choosing a solar installation contractor, be sure to check for the presence of warranties. It is important to confirm not only the duration of the warranty but also the coverage, disclaimers, and cost conditions.
Solar panels and battery storage units come with manufacturer warranties, but also check for the presence of a workmanship warranty in case leaks occur after installation!
If the contractor offers a workmanship warranty, they may cover any leaks that occur after installation within the warranty period and conditions.
Additionally, some contractors provide aftercare services separate from warranties, so be sure to check if the contractor you are considering has aftercare services.
Since abnormalities or damage on the roof may not be visible, you might not notice them yourself.
By conducting inspections of hidden areas during aftercare maintenance, you can more easily detect abnormalities early and prevent major repairs or failures!
Kakeru Koumuten Co., Ltd. offers a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof remodeling is performed.)
We also provide aftercare maintenance, sending out annual DM!
If you check the DM and wish for aftercare maintenance, we will visit you!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting solar panel installation, let’s obtain estimates from multiple contractors.
Even with the same manufacturer and the same construction details, costs may vary, and warranties and after-sales services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the estimate items”
“Type of solar panels”
“Warranties and after-sales services”
let’s carefully compare and make a judgment! If the rank of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price!
▶ Go to “Breakdown of Installation Capacity, Equipment, and Construction Costs” in this article
Check if they provide support for subsidy applications
There may be subsidies available for solar panel installations and battery installations, but if the order of procedures is incorrect or if there are deficiencies in the documents, the subsidy may not be granted.
Since there are systems like the Tokyo subsidy that require prior application, it is reassuring to have a contractor that supports the preparation of necessary documents and the flow of procedures.
Complete the procedures specified for each system (for the Tokyo subsidy, prior application) before proceeding with the construction!
For the Tokyo subsidy, after installation, a grant application and performance report must be submitted, and it will be granted after review! (The flow of procedures varies by system)
▶ Go to “Subsidies and Grants that May Apply in Machida City, Tokyo” in this article
Benefits of Introducing Solar Equipment
The benefits of introducing solar panels are as follows!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
While the selling price of electricity has decreased compared to ten years ago, you can gain benefits by reducing the electricity you buy from power companies through self-consumption of generated electricity!
As electricity costs rise, the ability to cover your power consumption with solar power becomes increasingly attractive!
If you plan to use the generated electricity at night, installing a storage battery is essential!
For residential use (under 10kW), the selling price (FIT) will be set at “24 yen/kWh for the first four years, and 8.3 yen/kWh from the fifth to the tenth year” for certifications after October 2025, and the same price will apply for the 2026 fiscal year. After the fifth year, it is likely to be more advantageous to use it at home (self-consume) rather than sell it, making the combination with a storage battery a viable option.
👉 Ministry of the Environment | For purchase prices and periods, click here
Advantage 2 You can utilize subsidies!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the conditions, you may be able to utilize subsidies!
Reducing the actual burden through subsidies is a significant advantage!
In the case of Machida City, there is a possibility of being eligible for national and Tokyo Metropolitan programs. According to the official page of Machida City, the city’s own solar power subsidy program ended in 2016 (please check the official page for the status of Tokyo Metropolitan programs).
Advantage 3 Environmentally friendly!
Solar power generation has low carbon dioxide emissions and can reduce dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (However, devices such as power conditioners do have operational noise.)
Advantage 4 Heat insulation effects can be expected!!
By installing on the roof or rooftop, the panels block direct sunlight to the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
（This does not improve the insulation performance of the building itself）
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it is possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation capability, you may be able to use electricity from a dedicated outlet during daytime generation.
（The devices, output, and time that can be used during a power outage vary depending on the model and wiring method）
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1 Maintenance costs can be incurred
A particularly overlooked maintenance cost is for the roof where solar panels are installed.
If you perform roof remodeling 10 to 20 years later, there will be costs for removing and reattaching the solar panels.
If the existing roof is deteriorated, it is reassuring to remodel it with durable roofing materials before installing the solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.
It would be reassuring to request a simulation considering maintenance costs before introducing solar panels!
Point 2 The risk of leaks may increase depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware with screws to the roofing material or substrate, waterproofing of the fixed parts is crucial.
In methods that involve making holes in the roof, the risk of leaks inevitably arises.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, one option is to replace the roofing material with a metal roof and fix the solar panels using the catch method. (The catch method has compatibility conditions between the roofing material and hardware, and it cannot be used with all metal roofs)
Catch-type base metal fittings for horizontal metal roofs
Note 3: The roof will become heavier
Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load-bearing capacity, replacing it with a lighter roof may also be an option if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply a matter of “this manufacturer has the best solar panels”; it is important to choose solar panels that are suitable for your life plan and building!
Here are some points to consider when comparing solar panels!
Choosing Method 1: Compare by Total Output of the Roof
When installing solar panels on the roof, it is important to know how much electricity can be generated in a limited area, and generating more electricity is always better!
Solar panels vary in size and output depending on the manufacturer.
A panel with an output of 350W and a panel with an output of 400W may seem at first glance that the higher output panel is better.
However, if the size of the panel does not fit well with the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” leading to different numbers of panels that can be installed on the same roof due to size differences.
400W × 15 panels = 6kW (total output of the roof)
350W × 20 panels = 7kW (total output of the roof)
As shown above, even if the output of a single panel is lower, the total output of the roof may be higher!
It is important to consider the total output of the roof rather than the output of a single panel!
*The above is a calculation of total output (kW). The actual electricity generation (kWh) will vary depending on conditions such as the roof’s orientation, slope, and shading.
Choosing Method 2: Compare by Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases after 10 years and 20 years.
The degree of output reduction after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or electricity generation itself.
Choosing solar panels without considering the degradation rate can lead to regrets later!
Choosing Method 3: Compare by Warranty Period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
For output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
It’s always better to have a longer warranty, so let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Machida City, Tokyo
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Machida City, Tokyo. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Machida City, Tokyo?
The cost varies depending on the installation capacity, equipment, and roof condition. In the above case study (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
For cost estimates by capacity, please refer to our solar panel and storage battery installation pricing page. We will create a layout diagram from the drawings and on-site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Machida City, Tokyo?
As of October 7, 2026, Tokyo’s “Household Solar Power Generation Promotion Project” (for existing homes, 15,000 yen per kW for systems under 3.75kW, with a maximum of 450,000 yen) and “Household Storage Battery Promotion Project” (100,000 yen per kWh for storage batteries, with a maximum of 1.2 million yen per household) are accepting pre-applications starting May 29, 2026, as stated on the official Tokyo (Cool Net Tokyo) page. According to the official page of Machida City, the city’s own solar power subsidy program ended in 2016. The national DR household storage battery program has also closed its application process.
Since the application status may change, please check the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies even after the construction is completed?
This depends on the program. Tokyo’s subsidies require prior application. Conditions regarding whether you can sign a contract or start construction before applying or submitting vary by program, so please confirm before signing a contract.
The order of procedures also varies by program, so please check before signing a contract or starting construction.
Can solar panels be installed on a slate roof? I’m worried about leaks.
It is possible to install on a slate roof, but it is necessary to check the condition of the roofing material and substrate. The method of securing the panels varies by installation method, and when securing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a specialist in exterior renovations with strong expertise in roofing work, so we will check the condition of the roof before installation and propose methods such as roof overlay (cover method) or replacement if deterioration is advanced.
My roof is old. Should I do a roof renovation first?
The condition of the roof will determine this. If a roof renovation is needed after 10 to 20 years of installation, the cost for removing and reinstalling solar panels will be incurred separately. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
Is it better to install a storage battery together with solar panels?
For those who want to use generated electricity at night or prepare for power outages, simultaneous installation is recommended. The selling price for electricity will be 8.3 yen/kWh after the fifth year, making it more advantageous to use it in your home rather than selling it.
Additionally, the Tokyo Metropolitan Government’s subsidy for storage batteries (100,000 yen per kWh for the 2026 fiscal year, with a maximum of 1.2 million yen per household) aims to increase self-consumption of electricity generated by solar power. You can compare “solar only” and “solar + storage battery” in a financial simulation for your consideration.
How many kW can be installed on my roof? Is it okay for north-facing roofs or roofs with shadows?
The capacity that can be installed varies depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create a layout diagram based on the drawings and site survey, and provide you with the installation capacity and power generation simulation.
Machida City spreads from the western to central part of the Tama Hills, characterized by a region with significant elevation differences. The shape and orientation of the roof, as well as the shadows cast by surrounding buildings, will differ for each house. You can check the estimated power generation through the power generation simulation.
How long will the construction period be?
In the above construction example (4.3 kW solar panels + storage battery), it took about 3 days. The duration may vary if roof work is performed simultaneously or depending on the shape and installation capacity of the roof.
Please note that separate time is required for applications for subsidies and power companies, so please consult us early.
What is the current selling price (FIT) for electricity?
For residential use (less than 10 kW), the selling price for certified systems after October 2025 will be 24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year, and the same price will apply for the 2026 fiscal year.
The idea is to recover initial costs quickly within the first 4 years and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that takes into account loan interest rates and electricity costs.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-maintenance notices via DM and visits customers who wish to have inspections. We can also clean solar panels using specialized brushes if the power generation is reduced due to dirt.
Since it is difficult to check areas on the roof by yourself, please feel free to consult us if you have any concerns.
Can you also renovate roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten can remove and reinstall solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them in a consistent manner. The removed panels can be stored in our warehouse.
For costs, please refer to the solar panel removal and hot water heater removal pricing page.
If you are looking for a solar panel installation company in Machida City, Tokyo, please consult Kakeru Koumuten.
Our company handles a wide range of exterior renovations, including solar panels, roofing work, and exterior wall work in Machida City, Tokyo.
We have received requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low cost”, and we have received positive feedback from numerous customers.
We continue to update our construction performance every year, and we will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, not only roof overlay work and re-roofing but also partial roof repairs, exterior painting, and exterior cover methods.
We are also happy to handle small jobs like partial repairs and rain gutter cleaning!
In urgent cases like water leakage work, we may be able to provide temporary measures without setting up scaffolding, as long as safety can be ensured, so please consult us!
“I want to know about recommended solar panels”, “I want to keep costs down as much as possible”, “I just want an estimate for now”, we will provide the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and will propose the optimal construction plan!
We are confident that we will not be outdone in terms of cost, quality, and organization compared to other companies in exterior construction!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if our company is found to be inferior to others, you are free to decline!
Characteristics of Machida City, Tokyo and Points for Solar Work
Machida City is located at the southern tip of Tokyo, protruding like a peninsula into Kanagawa Prefecture, covering the western to central part of the Tama Hills, with an area of 71.55 square kilometers. The highest elevation is 361.6 meters (Kusadoyama), and the lowest is 25 meters (east side of Miwa Housing Complex), as stated on the city’s official page. We have summarized the characteristics of the terrain in Machida City, Tokyo, and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Machida City, Tokyo and points for solar work
■ Hilly area with elevations ranging from 25 to 361.6 meters. The height difference of the site and the slope of the front road must be checked on-site for each house.
In the hilly area with significant elevation differences within the city, even within the same neighborhood, the height differences of the site, the step differences with the front road, and the slope and width of the road vary from house to house. It may be necessary to devise ways to set up scaffolding and transport panels and storage batteries, and the way shadows are cast by the roof orientation and surrounding buildings and trees also changes from place to place. At Kakeru Koumuten, our in-house scaffolding team plans the scaffolding according to the site, creates layout diagrams from the drawings and on-site surveys, and you can confirm this with a power generation simulation.
■ Check the Flood, Internal Water, and Landslide Hazard Map (Reiwa 8 Edition). Pay Attention to Equipment Installation Locations
The flood and landslide hazard map for Machida City was published on March 19, Reiwa 8 (2026), and distribution to all households began in June, as stated on the official page. It displays the expected flooding from overflowing rivers (external water) and rainwater overflow from sewer systems (internal water) together, and the rainwater overflow inundation expected area is designated based on the maximum rainfall that can be anticipated in the city (153 millimeters per hour), along with the landslide warning areas and special warning areas designated by Tokyo Metropolitan Government. Depending on where the power conditioner and storage battery are installed, whether indoors or outdoors, the impact during flooding may vary. Please check the assumptions for your residence on the city’s hazard map and consult with us regarding the installation location and height in conjunction with the installation conditions of the manufacturer you are using.
■ Roof Types and Age Vary from House to House. Check Roof and Waterproofing Before Installation
Even within the same city, the types of roofs, their ages, and the shapes of the lots vary from house to house. The capacity and fixing methods that can be installed change depending on the shape and orientation of the roof and the roofing materials used. At Kakeru Koumuten, we will confirm the type and condition of the roof and the situation of the lot before installation and propose fixing methods, waterproofing details, and scaffolding plans.
■ The Annual Sunshine Hours at Tokyo Observatory is Approximately 1,927 Hours
According to the Japan Meteorological Agency’s average values (1991-2020), the annual sunshine hours at Tokyo Observatory is approximately 1,927 hours, with January (about 193 hours) having the most and June during the rainy season (about 124 hours) having the least. (This is not based on observations in Machida City, but is a reference value.)
The power generation in Machida City can also change due to shadows from surrounding buildings and trees, so it is important to conduct a year-round power generation simulation and choose the capacity of the storage battery according to the times when electricity is used the most.
Our company handles many exterior construction and solar power projects in Machida City, Tokyo.
We are happy to assist with partial roof repairs such as roof overlay work, roof replacement, and leak repairs, as well as other repairs! Please feel free to consult us for any sudden troubles!
Service Area in Machida City, Tokyo
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and all of Tokyo.
List of Areas in Machida City, Tokyo
Machida City Aihara Town / Machida City Asahimachi / Machida City Okuracho / Machida City Ogawa / Machida City Onorimachi / Machida City Koyamagahara / Machida City Koyamada Sakuradai / Machida City Koyama Town / Machida City Kanai / Machida City Kanaioka / Machida City Kanai Town / Machida City Kanamori / Machida City Kanamori Higashi / Machida City Kamikoyamada Town / Machida City Kiso Nishi / Machida City Kiso Higashi / Machida City Kiso Town / Machida City Takagasaka Town / Machida City Shimokoyamada Town / Machida City Makoji / Machida City Makoji Town / Machida City Zushi Town / Machida City Chuo / Machida City Tamagawa Gakuen / Machida City Tsukushino / Machida City Tsurukawa / Machida City Tsuruma / Machida City Tokiwacho / Machida City Nakacho / Machida City Naruse / Machida City Narusegaoka / Machida City Narusedai / Machida City Nishinaruse / Machida City Negishi / Machida City Negishi Town / Machida City Noge Tani / Machida City Nozuta Town / Machida City Hara Machida / Machida City Higashi Tamagawa Gakuen / Machida City Hirogaka / Machida City Hirogaka Town / Machida City Fujinodai / Machida City Hon Machida / Machida City Minami Otani / Machida City Minami Tsukushino / Machida City Minami Naruse / Machida City Minami Machida / Machida City Miwa Town / Machida City Miwa Midoriyama / Machida City Morino / Machida City Yakushidai / Machida City Yabemachi / Machida City Yamazaki / Machida City Yamazaki Town
・For exterior wall painting in Machida, Tokyo, trust Kakeru Koumuten Co., Ltd.!
・For roof renovations in Machida, Tokyo, trust Kakeru Koumuten Co., Ltd.!
・For exterior renovations in Machida, Tokyo, trust Kakeru Koumuten Co., Ltd.!
・Kakeru Koumuten Co., Ltd.施工実績
・Kakeru Koumuten Co., Ltd. after maintenance
・Kakeru Koumuten Co., Ltd.施工メニュー・料金表
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and points to consider!
・Top 12 solar power generation manufacturers! Features and selection tips included!
・What are the installation costs for solar power generation? Tips for reducing costs thoroughly explained!
・What are the best locations for solar power installation? Points for selecting installation sites included!
・For solar power generation estimates, click here!
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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!
