Leave Your Solar Panel Installation in Atsugi City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
For
Solar Panel and Storage Battery Installation in
Atsugi City, Kanagawa Prefecture, trust Kakeru Koumuten!
Kakeru Koumuten is a specialized exterior renovation company headquartered in Aoba Ward, Yokohama City.
As a company strong in roofing work, we are entrusted with solar panel installation and storage battery installation considering roofs and waterproofing!
“How to Choose a Solar Panel Contractor in Atsugi City”
“Costs for Solar Panel and Storage Battery Installation”
“Subsidies Available for Solar System Installation in Atsugi City”
We will also explain the above three points!
Installing solar panels carries risks, such as the potential for “leaks” and other troubles.
To ensure a satisfactory solar panel installation, we recommend obtaining estimates from about three companies!
Table of Contents (Tap to Open/Close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Atsugi City, Kanagawa Prefecture
- Roof Inspection Before Installing Solar Panels
- Subsidies and Grants That May Be Applicable in Atsugi City
- 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 Company in Atsugi City, Kanagawa Prefecture
- 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 Atsugi City
- If You Are Looking for a Solar Panel Installation Company in Atsugi City, Contact Kakeru Koumuten
- Characteristics of Atsugi City, Kanagawa Prefecture and Key Points for Solar Work
- Service Area in Atsugi City, Kanagawa Prefecture
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Atsugi City, Kanagawa Prefecture
The reasons why our company is entrusted with solar panel installation by customers in Atsugi City, Kanagawa Prefecture include
one reason being that Kakeru Koumuten has a base in Kanagawa Prefecture,
and our unique strengths in solar panel installation that cannot be replicated by other companies, which 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 Can Also Handle Exterior Renovations Other Than Solar Panel Installation!
Troubles such as leaks that occur during solar panel installation 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 issues and troubles after installation!
Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent troubles after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has organized the following warehouses and material storage areas to provide low-cost, high-quality solar work and exterior renovations.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house 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 using our own scaffolding team, we can also cut costs for scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
In Atsugi City, where residential areas spread from low-lying areas along the Sagami River to the western hills and mountains, our in-house scaffolding team will plan 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 a stock of roofing materials, so we canrespond quickly 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, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and see how they are installed on the roofing materials!
We can also provide simulations for potential earnings and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany projects, we also have samples of roofing materials and models that explain the structure, allowing us to provide detailed explanations!
3.All work performed by our own team
One of Kakeru Koumuten’s major strengths is its complete in-house construction.
By having Kakeru Koumuten handle everything from inquiries to project completion in a consistent manner, we can keep costs down and provide high-quality roof renovations.
Additionally, one representative will assist you from the estimate to the completion of the work.
Since the person in charge does not change, whether it’s the sales representative or the construction management representative, smooth communication is possible.
We can provide consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits Obtained & Skilled Workers on Staff
We have obtained construction industry licenses and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians on staff, and we are confident in our construction techniques.
We can also handle large-scale roof projects such as those for factories!
5. Warranty and Aftercare Maintenance
In addition to the manufacturer’s warranty for solar panel installation work, our own construction warranty (leakage warranty) is also included!
(The construction warranty 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 roof renovations are performed. The construction warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary based on the warranty details.)
Aftercare maintenance is available annually, and we send out notification DM every year.
If you have 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.
Even if you cannot access the roof at high altitudes, we can utilize drones to assist you!
During leak investigations, we can also conduct inspections using a thermal imaging camera.
If the power generation of your solar panels decreases due to dirt or other factors, we can provide cleaning services using specialized brushes.
We will respond according to your preferences.
7. Human Resource Development
To improve skills, we create various roofing 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 not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar installation guidebook” and “profit and loss simulations” that take into account loan interest rates and electricity costs.
The profit and loss simulation can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar installations will receive materials that clearly summarize important points and potential drawbacks!
We encourage you to obtain comparative estimates and review plans from other companies!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 to 30 years.
It is crucial to confirm before installation whether it is safe to place them directly on the current roof, as this is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, specializing in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | 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 a roof renovation first. |
| 2. Condition of Substrate and Waterproof Sheet | If the sheathing or roofing (waterproof sheet) under the roofing material is damaged, it can 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, can affect the power generation. We will create a layout diagram from the drawings and the 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. Since the number of panels that can be installed varies depending on the size of the panels, we will compare based on the total output of the roof. |
| 5. Fixing Method and Waterproofing Details | We will confirm 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 construction method, so please check the waterproofing treatment of the fixed 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. Location of Equipment Installation and Wiring | We will check the installation location of the power conditioner and storage battery, as well as the wiring route to the distribution board. The length of the wiring also affects the cost. |
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 the roof material and substrate with screws) | Waterproofing treatment of fixing parts, cracks or deterioration of slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suitable for 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 and Vertical) | Fixed with catch-type brackets that grip the roof material (depends on the combination of roof material and brackets) | Whether the roof material and brackets are compatible, installation conditions from the roof material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a framework | Type and deterioration status of the waterproof layer, waterproofing around the framework. Consider in conjunction with the timing of waterproofing work. |
If you perform roof renovations 10 to 20 years after installation, there will be additional costs for the removal and reinstallation of solar panels. If the roof is deteriorating, renovating to a highly durable roofing material before installation may help reduce costs in the long run.
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 according to the condition of your roof!
▶ Click here for roof renovations in Atsugi City, Kanagawa Prefecture
PotentialSubsidies and Grants
If you are introducing solar panels or storage batteries in Atsugi City, you may be eligible for programs from the “National Government,” “Kanagawa Prefecture,” and “Atsugi City.”
The following information is based on the official pages of each program as of October 6, 2026. The application status may change depending on the budget and application period, 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 |
|---|---|---|---|
| Atsugi City “Housing Energy Efficiency Equipment Introduction Promotion Subsidy” (Solar Power Systems, Storage Batteries, etc.) | Applicable when installed in residential properties within the city. Installation via lease or PPA is also included. Please check the city’s official page for detailed eligibility and conditions. | According to the city’s official page, the subsidy for solar power is 70,000 JPY per kW (maximum 420,000 JPY), and for storage batteries, it is a maximum of 51,000 JPY per kWh (including additions for meeting self-consumption rate requirements). | Introduced as a plan from Reiwa 4 to Reiwa 8. Applications will be accepted within the budget limits, so please check the city’s official page for application status and procedures. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Housing Solar Power and Storage Battery Installation Subsidy” | For single-family homes or multi-family residences within the prefecture, where solar power and storage batteries are installed together in earthquake-resistant homes. Applications must be made by the individual, and construction must begin after the grant decision. | Solar Power: 70,000 JPY/kW Storage Battery: 150,000 JPY/unit |
Phase 1: May 11, 2026 – June 30, 2026 Phase 2: September 7, 2026 – September 30, 2026 (first-come, first-served) Phase 2 has reached its application deadline. Please check the prefecture’s official page for future recruitment. |
| National “DR Home Storage Battery Project” (Reiwa 7 Year Supplement) | Newly introducing registered home storage systems that can be utilized for DR (demand response). | Calculated based on a standard amount of 34,500 JPY per initial effective capacity of 1 kWh (subsidy rate within 3/10; maximum 600,000 JPY per application). | As of May 29, 2026, the budget has been reached, and public recruitment has ended (applications are currently not possible). |
| 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 renovation of windows (openings) and the structure; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities. | Storage Battery: 96,000 JPY/unit | Ends as soon as the budget limit is reached. Please check the official site for application status. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Type Renewable Energy Installation Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). Solar power must have a generation output of 10 kW or more, for business facilities, and equipment not certified under FIT/FIP. | Solar Power: 80,000 JPY/kW, etc. Storage System: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Recruitment ended on September 3, 2026 (application amounts reached the budget amount). |
As of October 6, 2026, the subsidy for housing in Kanagawa Prefecture has passed the application deadline for the second period of the 2026 fiscal year, and the national DR household storage battery project has also ended its public recruitment. The incentive program in Atsugi City is accepting applications within the budget, so please check the application status on the city’s official page. The condition for the prefectural housing subsidy is that construction must begin after receiving the “grant decision”, and starting construction beforehand may result in ineligibility. It is not guaranteed that a grant will be awarded upon application, so please confirm before contracting and starting work.
At Kakeru Koumuten, we will guide you on the eligibility conditions for each program after confirming them.
Atsugi City “Residential Energy-Saving Equipment Introduction Incentive” (Solar Power Systems, Storage Batteries, etc.)
Atsugi City has established the “Residential Energy-Saving Equipment Introduction Incentive” for those who install energy-saving equipment such as solar power systems and storage batteries in their homes. The city’s official page introduces this as a plan from the 2022 to 2026 fiscal years, and installations through leasing or PPA are also included.
The subsidy amount is introduced on the city’s official page as 70,000 yen per kW for solar power (up to 420,000 yen) and up to 51,000 yen per kWh for storage batteries, which includes additional amounts for meeting requirements such as self-consumption rates.
Applications will be accepted within the budget, and the timing, procedures, and conditions for additional amounts need to be confirmed each fiscal year. Please check the latest application status on the city’s official page.
👉 Click here for the official Atsugi City guidance page
National Subsidy “DR Household Storage Battery Project (Support Project for the Introduction of Household Storage Systems for DR Resources)”
The national government has been implementing the “DR Household Storage Battery Project” to support the installation of household storage batteries.
This program targets those who are newly introducing registered products’ storage systems that can be utilized for demand response (DR). In the 2025 fiscal year supplementary budget, the standard amount was set at 34,500 yen per 1 kWh of initial effective capacity, with a subsidy rate of up to 30% and a maximum subsidy amount of 600,000 yen per application. There are also conditions such as ineligibility for items contracted or ordered before the grant decision.
However, the supplementary budget for the 2025 fiscal year reached its budget limit on May 29, 2026, and the public recruitment has ended (the previous year’s supplementary budget for 2024 also ended public recruitment on July 2, 2025). Applications are currently not possible, so please check the official site for future public recruitment.
Furthermore, there are currently no subsidies confirmed for the installation of solar panels in existing homes.
👉 Click here for the official site of the DR Household Storage Battery Project
Kanagawa Prefecture “2026 Fiscal Year Kanagawa Prefecture Housing Solar Power and Storage Battery Installation Subsidy”
Kanagawa Prefecture provides subsidies for those who install both “solar panels” and “storage batteries” in their homes.
The details of the subsidy are as follows: 70,000 yen per 1 kW of solar power generation output, and 150,000 yen per storage system unit.
For example, if you introduce a 4 kW solar panel and one storage battery, the calculation for the subsidy amount would be 4 kW × 70,000 yen + 150,000 yen = 430,000 yen.
Conditions include that the storage system must be a registered product, if construction begins before the grant decision, it will be excluded, and the application must be made by the individual (proxy applications by contractors are not allowed). Additionally, the target housing must ensure seismic performance. Regarding the combination with other subsidy systems, the eligibility may vary by system, so please be sure to check.
In the 2026 fiscal year, the first application period (May 11 – June 30) and the second application period (September 7 – September 30, first-come-first-served) were conducted, and the second period has reached its application deadline. For future recruitment, please check the official page of Kanagawa Prefecture.
👉 Here is the official page of Kanagawa Prefecture
Kanagawa Prefecture “2026 Fiscal Year Kanagawa Prefecture Subsidy for Introducing Self-Consumption Type Renewable Energy” (for businesses)
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners who file blue returns, and the introduction to individual residences is not eligible.
Solar power generation must have an output of 10 kW or more, supply electricity to business facilities within the prefecture, and not be facilities certified under FIT or FIP.
The subsidy amount is 80,000 yen per 1 kW of solar power generation, and 50,000 yen per 1 kWh for the accompanying storage system (with a maximum of 5 million yen).
In the 2026 fiscal year, the application amount reached the budget amount, so applications were closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings in Atsugi City should check the official page of Kanagawa Prefecture for the next recruitment.
👉 For more details, click here
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | For Costs of Solar Panel Installation and Battery Installation, Click Here
⇧Service Menu | For Costs of Solar Panel Removal and Water Heater Removal, Click Here
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and 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 significantly depending on the installation capacity, equipment grade, and roof condition.
Considerations for 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 (kilowatt). Batteries are compared based on the amount of electricity they can store, represented in kWh (kilowatt-hour).
The amount of kW that can be installed on a roof varies for each house based on the roof’s shape, orientation, and size. 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 panels 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 approximate amounts and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Service Menu | For Costs of Solar Panel Installation and Battery Installation, Click Here
Items to Confirm in the Estimate (Cost Confirmation)
When comparing estimates, it’s common to compare different capacities and equipment. 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 listed. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also confirm whether it is a type that controls in conjunction with a storage battery. |
| 3. Storage Battery | Manufacturer, model number, capacity (kWh), usable range during power outages (entire 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, and whether there is a monitor to check the power generation amount. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed points, and whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | How much support is included 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 double-counted. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal 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 capacities differ, both the price and power generation will change. Kakeru Koumuten Co., Ltd. welcome comparisons, so if you bring estimates from other companies, we will explain the differences for each item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can obtain a rough estimate and a profit simulation for up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the storage battery, you can get a rough estimate and profit simulation!
*The simulation results are estimates. Actual profits may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Testimonials
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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
| Construction Details |
| Solar Panel Installation Battery Installation |
| Existing Roofing Material |
| Horizontal Metal Roof (Super Galtect) |
| Installation Capacity |
| Solar Panel: 4.3kW Battery: 5kWh range |
| Base Mounting Hardware Used |
| Niigata Manufacturing/Aluminum Catch-Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed by gripping the horizontal metal roof with catch-type hardware (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY *Due to the grant being provided, 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 |
| About 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 can be granted. |
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 the grant, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Atsugi City, Kanagawa Prefecture
There are many solar panel installation contractors available in Atsugi City, Kanagawa Prefecture, and it can be confusing to choose which contractor to go with.
For this reason,when requesting solar panel installation or battery storage installation work, make sure to check the following 4 points.
● Have extensive knowledge not only of solar power but also of roofs
● Confirm the existence of warranties and aftercare maintenance
● Obtain estimates from multiple contractors (3 companies is a guideline)
● Check if they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable contractor.
Have knowledge not only of solar panels but also of roofs
Defective installation of solar panels can sometimes be caused by a lack of knowledge and verification regarding roofs and waterproofing.
While knowledge of 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 severely deteriorated roof, leading to leaks
・Solar panels were installed on a roof with a short lifespan, requiring renovations to detach and reattach the solar panels within a few years
・Misjudgment of the type of waterproofing led to incorrect processing and resulted in 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 existence of warranties and aftercare maintenance
When choosing a solar installation contractor, make sure to check for warranties. It is important to confirm not only the duration of the warranty but also the scope of coverage, exclusions, and cost conditions.
Solar panels and battery storage units come with manufacturer warranties, but also check for the existence 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 offer after-service separate from the warranty, so be sure to check if the contractor you are considering has after-service.
Changes or damage on the roof may occur in areas that are not visible, so there is a possibility that customers may not notice them.
By conducting inspections in after-maintenance, even in hidden areas, you can more easily prevent significant repairs or failures by discovering abnormalities early!
Kakeru Koumuten Co., Ltd. provides a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installation is 10 years, and depending on the condition of the roof before installation, a roof renovation may be required to provide the warranty.)
We also conduct after-maintenance and send out DM every year!
Please check the DM, and if you wish, we will visit for after-maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting solar panel installation, be sure to obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs may vary, and warranties and after-services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request from your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the items in the estimate”
“Type of solar panel”
“Warranties and after-services”
and make careful comparisons to make your decision! 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 installation and battery installation, but if the order of procedures is incorrect or if there are deficiencies in the documents, the subsidy may not be granted.
For systems like the Kanagawa Prefecture housing subsidy, where the contractor cannot apply on your behalf and the application must be made by the individual, 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 prefectural housing subsidy, this means obtaining a grant decision) before proceeding with the construction!
For the prefectural housing subsidy, after the construction is completed, a performance report must be submitted, and after review, the subsidy will be granted! (The flow of procedures varies by system)
▶ To “Subsidies and Grants That May Be Applicable in Atsugi City” within this Article
Benefits of Installing Solar Equipment
The benefits of installing solar panels are as follows!
Benefit 1: Economic Benefits
The biggest advantage of installing solar panels is the economic benefit!
Although the selling price of electricity has decreased compared to ten years ago, you can benefit by reducing the amount of electricity purchased from the utility company by consuming the generated power yourself!
As electricity costs rise, the ability to cover your consumption with solar power becomes increasingly attractive!
If you plan to use the generated power at night, installing a storage battery is essential!
For residential use (under 10kW), the selling price (FIT) from certifications after October 2025 is set at “24 yen/kWh for the first four years, and 8.3 yen/kWh from the fifth to the tenth year.” The same price will apply in the 2026 fiscal year. After the fifth year, it is generally more advantageous to use the power at home (self-consumption), making the combination with a storage battery a viable option.
👉 Ministry of the Environment | For purchase prices, periods, etc., click here
Benefit 2: You Can Utilize Subsidies!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the requirements, you may be able to utilize subsidies!
Reducing the actual burden amount through subsidies is a significant advantage!
In the case of Atsugi City, you may be eligible for programs from the national government, Kanagawa Prefecture, and Atsugi City. Please check the city’s official page for the status and conditions of the “Residential Energy-Saving Equipment Installation Promotion Subsidy.”
Benefit 3: Environmentally Friendly!
Solar power generation has low carbon dioxide emissions and reduces 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 like power conditioners may have operational noise.)
Benefit 4: Expect Heat Insulation Effects!!
By installing them on the roof or rooftop, the panels block direct sunlight from hitting the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
(Note that this does not improve the building’s insulation performance 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 capabilities, you may be able to use electricity from a dedicated outlet during daytime power generation.
(The devices, output, and duration 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 renovations 10 to 20 years later, there will be costs for removing and reinstalling the solar panels.
If the existing roof is deteriorating, it is reassuring to renovate it with durable roofing materials before installing 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 is reassuring to be able to simulate maintenance costs before introducing solar panels!
Point 2: The risk of leaks increases depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but when using screws or other fasteners to secure the roofing material and substrate, waterproofing of the fixed parts is crucial.
If the method involves making holes in the roof, the risk of leaks will inevitably occur.
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 secure the solar panels using the catch method. (The catch method has compatibility conditions between the roofing material and the fasteners, 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, switching to a lightweight roof may be one 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 based on total roof output
When installing solar panels on the roof, it is important to know how much power can be generated in a limited area, and the more power generated, the better!
Solar panels come in various sizes depending on the manufacturer, and their outputs also differ.
If you compare a 350W output panel with a 400W output panel, at first glance, the panel with higher output may seem 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,” resulting in different installation capacities on the same roof due to the size difference.
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 calculations are for total output (kW). The actual power generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
Choosing Method 2: Compare based on degradation rates of solar panels
Solar panels have degradation rates, and their output gradually decreases over 10 or 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 power generation itself.
By considering the degradation rate along with the initial output, you can choose solar panels without regrets!
Choosing Method 3: Compare based on warranty years
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty years vary by manufacturer.
For output warranties, some manufacturers offer a 30-year warranty, while others may only offer a 10-year warranty, so it varies!
Longer warranties are generally better, so be sure to check the warranty years and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Atsugi City
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Atsugi City. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Atsugi City, Kanagawa Prefecture?
The cost varies depending on the installation capacity, equipment, and condition of the roof. In the above construction example (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
Guidelines by capacity are published on the 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 Atsugi City?
As of October 6, 2026, Atsugi City’s “Housing Energy Efficiency Equipment Introduction Promotion Subsidy” is introduced on the city’s official page as a program until Reiwa 8, and you can check the application status on the city’s official page. The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power and 150,000 yen per unit for storage batteries) is approaching the application deadline for the second term of Reiwa 8, and the national DR home storage battery project has ended its public recruitment. Please check each official page for future applications.
Since the application status changes, please refer to the subsidies and grants section and consult with us before signing a contract.
Can I apply for subsidies after the construction is completed?
For many programs, procedures are required before construction. The timing and procedures for applying for Atsugi City’s subsidy are specified for each program, and the Kanagawa Prefecture subsidy requires “commencement of construction after grant decision.” If the order is incorrect, you may be excluded from eligibility, so please confirm before signing a contract or starting construction.
The order of procedures varies by program, so please confirm before signing a contract or starting construction.
Can solar panels be installed on a slate roof? I’m worried about leaks.
Installation is possible on a slate roof, but it is necessary to check the condition of the roofing material and substrate. The method of securing varies by construction method, and in methods that secure brackets to the roofing material or substrate, waterproofing of the secured areas is crucial.
Kakeru Koumuten is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation, and if deterioration is advanced, we can also propose methods such as roof overlay (cover method) or replacement before installation.
The roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. 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 about the installation process after confirming the condition of the roof through a site survey!
Should I install a storage battery together with the solar panels?
If you want to use the 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 subsidy from Kanagawa Prefecture requires the simultaneous introduction of solar panels and storage batteries. Please check the official page for the city’s incentive requirements, including additional conditions. You can compare “solar panels only” and “solar panels + storage batteries” through a financial simulation.
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 from the drawings and site survey, and provide you with the installation capacity and power generation simulation.
Atsugi City has a variety of terrains from flat land along the Sagami River to hilly areas and mountainous regions, and the shading from neighboring houses, trees, and elevation differences varies from one house to another. You can check the expected power generation through the power generation simulation.
How long will the construction period be?
In the above construction example (solar panels 4.3 kW + storage battery), it took about 3 days. The duration may vary if roofing work is done simultaneously or depending on the shape of the roof and installation capacity.
Please note that additional time is required for applications for subsidies and power companies, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (under 10 kW), the selling price from certifications 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 more quickly in 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 direct mail and visits customers who request inspections. We can also clean solar panels using specialized brushes if the power generation decreases due to dirt.
It can be difficult to check areas on the roof by yourself, so please feel free to consult us if you have any concerns.
Can you renovate a roof that already has 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 all in one go. The removed panels can be stored in our warehouse.
For information on costs, please see the solar panel removal and hot water heater removal pricing page.
If you are looking for a solar panel installation company in Atsugi City, please consult Kakeru Koumuten
Our company handles a wide range of exterior renovations, including solar panels, roofing work, and exterior wall work, in Atsugi City, Kanagawa Prefecture.
We have received requests from many customers, including renovation companies and real estate agencies, who have contacted us!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received positive feedback from numerous customers.
We continue to update our construction performance records every year, and we will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, including roof overlay work, roof replacement work, partial roof repairs, exterior painting, and cover installations, all by our own team.
We are also happy to handle small jobs such as partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide emergency 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 by other companies in terms of cost, quality, and organization for exterior work!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if our company is found to be inferior to others, feel free to decline!
Characteristics of Atsugi City, Kanagawa Prefecture, and Points for Solar Work
Atsugi City is located almost in the center of Kanagawa Prefecture, with the Sagami River flowing on the eastern side and hilly and mountainous areas spreading on the western side. The flat land along the Sagami River is urbanized, while a little further west, there are residential areas with gentle undulations and mountain villages, making it a city with a diverse environment depending on the region.
We have summarized the characteristics of Atsugi City and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Atsugi City and points for solar work
■ From flat land to hilly areas and mountains. Check sunlight exposure based on the location of residences
Atsugi City has urban areas spreading along the flat land by the Sagami River, while hilly and mountainous areas are lined up on the western side. Depending on the location, the surrounding buildings, trees, elevation differences, and the silhouette of the mountains create different shadows, affecting sunlight exposure in the morning and evening. At Kakeru Koumuten, we create layout diagrams based on blueprints and the actual site conditions, allowing you to check with a power generation simulation.
■ Confirm Installation Locations for Equipment in Low-Lying Areas Along the Sagami River
If you live in low-lying areas such as along the Sagami River, it is reassuring to check the flood risk for your location using a hazard map when deciding on the installation locations for batteries and power conditioners. In mountainous or sloped areas, it is also important to confirm the relationship between the installation site and slopes or retaining walls. We will propose installation locations considering wiring routes and ease of inspection.
■ Consider Leaves and Shadows Near Mountains and Trees
In residential areas near the mountains of Tanzawa or those with many trees, you may be affected by falling leaves and branches. Accumulation of dirt such as leaves and dust on the roof can impact power generation, so it is important to consider the arrangement of panels and ease of cleaning and inspecting the rain gutters.
■ Ensure Proper Installation of Fixed Parts to Prepare for Rain and Wind
When placing panels on the roof, it is crucial to ensure that waterproofing of the fixed parts is properly done to prevent rainwater from entering through the mounting brackets. In elevated or open areas that are susceptible to wind, we will also confirm the mounting frame and fixing methods.
■ Check the City’s Subsidy Status and Procedures on the Official Page
Atsugi City’s Housing Energy Efficiency Equipment Introduction Promotion Subsidy (Atsugi City Carbon Neutral Platform) is a system that accepts applications within the budget. Since the application timing, procedures, and conditions for additional subsidies are specified, it is important to check this in advance in conjunction with the timing of the construction.
■ Check the Roof Condition According to the Age of the Building
For homes that have been built for several years, it is important to check the condition of the roofing materials and substrate before installing solar panels. Depending on the condition of the roof, installing them simultaneously with roof renovations can reduce future costs for removing and reattaching solar panels.
Our company is based in Kanagawa Prefecture and handles many exterior and solar construction projects in Atsugi City.
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 Atsugi City, Kanagawa Prefecture
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and the entire Tokyo Metropolitan Area.
List of Areas in Atsugi City, Kanagawa Prefecture
Aikou, Atsugi City / Aikou Nishi, Atsugi City / Aikou Higashi, Atsugi City / Ainuma, Atsugi City / Asahicho, Atsugi City / Atsugi, Atsugi City / Atsugi-machi, Atsugi City / Azumacho, Atsugi City / Iiyama, Atsugi City / Izumicho, Atsugi City / Oikawa, Atsugi City / Oji, Atsugi City / Okada, Atsugi City / Okazukokuku, Atsugi City / Ono, Atsugi City / Onma, Atsugi City / Kaneda, Atsugi City / Kamiyachida, Atsugi City / Kamiogino, Atsugi City / Kamiochiai, Atsugi City / Kamikozawa, Atsugi City / Kotobukicho, Atsugi City / Saiwaicho, Atsugi City / Sakai, Atsugi City / Sakaecho, Atsugi City / Sarugashima, Atsugi City / Sanda, Atsugi City / Sanda Minami, Atsugi City / Shimoichida, Atsugi City / Shimoogino, Atsugi City / Shimokawairi, Atsugi City / Shimotsukokuku, Atsugi City / Shimokozawa, Atsugi City / Sekiguchi, Atsugi City / Tanazawa, Atsugi City / Tamura-machi, Atsugi City / Tsumada, Atsugi City / Tsumada Higashi, Atsugi City / Tsumada Nishi, Atsugi City / Tsumada Minami, Atsugi City / Tsumada Kita, Atsugi City / Toda, Atsugi City / Tobi, Atsugi City / Tomuro, Atsugi City / Nakayachida, Atsugi City / Nakaoogino, Atsugi City / Nakacho, Atsugi City / Nagatsuna, Atsugi City / Nanazawa, Atsugi City / Onsen, Atsugi City / Onsen Nishi, Atsugi City / Nagatani, Atsugi City / Hayashi, Atsugi City / Higashimachi, Atsugi City / Funako, Atsugi City / Matsueda, Atsugi City / Matsukagedai, Atsugi City / Mizuhiki, Atsugi City / Midorigaoka, Atsugi City / Minamimachi, Atsugi City / Miharu no, Atsugi City / Miyanosato, Atsugi City / Mouri-dai, Atsugi City / Motomachi, Atsugi City / Morinosato, Atsugi City / Morinosato Aoyama, Atsugi City / Morinosato Wakamiya, Atsugi City / Yamagita, Atsugi City
・Exterior wall painting in Atsugi City, Kanagawa Prefecture, is entrusted to Kakeru Koumuten Co., Ltd.!
・Roof renovation in Atsugi City, Kanagawa Prefecture, is entrusted to Kakeru Koumuten Co., Ltd.!
・Exterior renovation in Atsugi City, Kanagawa Prefecture, is entrusted to Kakeru Koumuten Co., Ltd.!
・Kakeru Koumuten Co., Ltd. construction achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. construction menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・Top 12 solar power generation manufacturers! Features and selection tips are also introduced!
・What are the installation costs for solar power generation? Comprehensive tips to reduce costs!
・What are the best locations for solar power installation? Key points for site selection are also introduced!
・Here is the introduction to solar power generation estimates!
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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!
