Leave Your Solar Panel Installation Work in Atsugi City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
For
Solar Panel and 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 and battery installation considering roofing and waterproofing!
“How to Choose a Solar Panel Contractor in Atsugi City”
“Costs for Solar Panel and 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 occurrence of leaks” and other troubles.
To ensure a satisfactory solar panel installation, we recommend obtaining estimates from about three companies!
Table of Contents (tap to expand)
- 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 Financial Simulator 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 Installation
- Service Area in Atsugi City, Kanagawa Prefecture
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Atsugi City, Kanagawa Prefecture
The reasons 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 we have unique strengths in solar panel installation that cannot be replicated by other companies, which has garnered positive feedback 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 estimates from any number of companies!
1. We Can Also Handle Exterior Renovations Besides 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 you are knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have knowledge about the roof to avoid maintenance 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.Equipment Specialized for Exterior Renovation
Kakeru Koumuten Co., Ltd. has organized the following warehouses and material storage areas to provide low-cost, high-quality solar and exterior renovation work.
We have established five bases centered in Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house Ownership of Scaffolding Materials
To ensure safety during work on the roof, we own the necessary scaffolding materials for temporary scaffolding based on construction conditions and can assemble the scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also reduce the costs associated with scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
In Atsugi City, where residential areas spread from the lowlands along the Sagami River to the hills and mountains on the west side, 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, we canpurchase materials at a lower cost!
Additionally, we always have a stock of roofing materials, allowing us torespond quickly in emergencies!
In-house sorting and transportation of waste materials
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!
It is also possible to simulate the revenue and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that show the structure, allowing for detailed explanations!
3.All Work Performed by Our Own Team
One of Kakeru Koumuten’s major strengths is all work performed by our own team.
By maintaining a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof remodeling at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the same person is responsible for sales and construction management, smooth communication is possible.
We can perform consistent in-house work from temporary scaffolding installation to exterior wall painting and roof remodeling!
4. Various Permits and Skilled Workers
We have obtained construction industry permits 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 roofing projects such as those for factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty, our solar panel installation work comes with our own workmanship warranty (leakage warranty)!
(The workmanship 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 without performing roof renovation. The workmanship 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 any questions about the warranty, please click on the image above!
6. Flexible and Prompt Response
We are equipped to handle various roof troubles and situations.
If you cannot access the roof at high places, we can utilize drones for inspection!
During leakage 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 also provide cleaning with a specialized brush.
We will respond according to the customer’s wishes.
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 conduct skill enhancement training so that each staff member can respond to various cases.
8. Creation of Easy-to-Understand Materials and Simulations
At Kakeru Koumuten Co., Ltd., in addition to “estimates”, “layout diagrams”, and “power generation simulations”, we also provide a “solar panel installation guidebook” and a “financial simulation” that takes into account loan interest rates and electricity costs.
The financial simulation can project cumulative income and expenses over 20 to 30 years.
Even customers who are not familiar with solar panel installations can easily understand the materials, including important points and disadvantages!
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 or 30 years.
“Is it okay to install them directly on the current roof?” Checking this before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten Co., Ltd., which specializes in roofing work, has summarized the items to check before installation.
| 1. Type of roofing material and age | The method of securing the panels varies depending on the roofing material, such as slate, tiles, metal roofs, or flat roofs (roof waterproofing). If the remaining lifespan of the roofing material is short, we may suggest a roof renovation first. |
| 2. Condition of the substrate and waterproof sheet | If the sheathing or roofing (waterproof sheet) beneath the roofing material is damaged, it can affect the fastening strength and waterproofing. We also check for 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 power generation. We create a layout diagram from the drawings and the site, and you can confirm it with the power generation simulation. |
| 4. Shape of the roof and installable area | The number of panels (installation capacity) that can be placed depends on the shape and size of the roof. The number of panels that can be installed varies by panel size, so we compare based on the total output of the roof. |
| 5. Method of securing and waterproofing details | We check whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The fastening method varies by technique, so please confirm the waterproofing treatment of the fastening parts during the estimate. |
| 6. Weight of the roof | The roof will become heavier due to the panels. After investigating the existing roof, substrate, and load-bearing capacity, replacing with lighter roofing materials may be an option if necessary. |
| 7. Location of equipment installation and wiring | We check 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 also affects costs. |
Securing 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) | Waterproof 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 a method 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, a method that does 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 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 is strong 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
Potential Subsidies and Grants in Atsugi City, Kanagawa Prefecture
If you are introducing solar panels or storage batteries in Atsugi City, there is a possibility that 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 due to budget and recruitment periods, 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 Conservation 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 yen per kW (up to 420,000 yen), and for storage batteries, it is up to 51,000 yen per kWh (including additional amounts if requirements such as self-consumption rate are met). | Introduced as a plan from fiscal year 2022 to fiscal year 2026. Applications will be accepted within the budget limits, so please check the city’s official page for application status and procedures. |
| Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Housing Solar Power Generation and Storage Battery Installation Subsidy” | For detached houses or apartment buildings within the prefecture, it is required to install both solar power generation and storage batteries in earthquake-resistant homes. Applications must be made by the individual, and construction can begin after the grant decision. | Solar Power: 70,000 yen/kW Storage Battery: 150,000 yen/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” (Fiscal Year 2025 Supplement) | Newly install home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on a standard amount of 34,500 yen per kWh of initial effective capacity (subsidy rate within 30% and a maximum of 600,000 yen per application). | As of May 29, 2026, the budget has been reached, and public recruitment has ended (applications are currently not accepted). |
| 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 yen/unit | Ends as soon as the budget limit is reached. Please check the official site for application status. |
| Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Self-Consumption Type Renewable Energy Installation Subsidy” | Corporations and individual business owners filing blue returns (individual residential properties 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 yen/kW, etc. Storage System: 50,000 yen/kWh (maximum 5,000,000 yen) |
Recruitment ended on September 3, 2026 (application amounts reached the budget amount). |
As of October 6, 2026, the housing subsidies for Kanagawa Prefecture have passed the application deadline for the second period of the 2026 fiscal year, and the national DR home 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.
Kakeru Koumuten will provide guidance on eligibility conditions for each program after confirming them.
Atsugi City “Housing Energy Efficiency Equipment Introduction Incentive” (Solar Power Systems, Batteries, etc.)
Atsugi City has established the “Housing Energy Efficiency Equipment Introduction Incentive” for those installing energy-saving equipment such as solar power systems and 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 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 information page
National Subsidy “DR Home Battery Project (Support for the Introduction of Home Battery Systems for DR Resource Introduction)”
The national government has been implementing the “DR Home Battery Project” to support the installation of home batteries.
This program targets those introducing new registered battery systems that can be utilized for demand response (DR), and in the 2025 fiscal year supplementary project, the subsidy amount was determined based on a standard amount of 34,500 yen per kWh of initial effective capacity, with a subsidy rate of up to 30% and a maximum of 600,000 yen per application. There are conditions such as ineligibility for items contracted or ordered before the grant decision.
However, the supplementary funds for the 2025 fiscal year reached the budget limit on May 29, 2026, and public recruitment has ended (the previous year’s supplementary funds for the 2024 fiscal year also ended public recruitment on July 2, 2025). Applications are currently not possible, so please check the official site for future public recruitment.
Additionally, there are currently no subsidies confirmed for the installation of solar panels in existing homes.
👉 Click here for the official DR Home Battery Project website
Kanagawa Prefecture “2026 Fiscal Year Kanagawa Prefecture Housing Solar Power and Battery Installation Subsidy”
Kanagawa Prefecture provides subsidies for those who install both “solar panels” and “batteries” in their homes.
The details of the subsidy are as follows: 70,000 yen per kW for solar power generation and 150,000 yen per storage system.
For example, if you introduce a 4kW solar panel and one storage battery, the calculation for the subsidy amount would be 4kW × 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 (applications by contractors on behalf are not allowed). It is also a condition that the eligible housing must ensure seismic performance. Regarding the combination with other subsidy programs, the eligibility may vary by program, so please be sure to check.
In Reiwa 8, the first phase (May 11 – June 30) and the second phase (September 7 – September 30, first-come-first-served) are being accepted, and the second phase 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 “Reiwa 8 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 filing blue returns, and the introduction to individual residences is not eligible.
Conditions include that the solar power generation must have an output of 10kW or more, supply electricity to business facilities within the prefecture, and not be equipment certified under FIT or FIP.
The subsidy amount is 80,000 yen per kW for solar power generation and 50,000 yen per kWh for the accompanying storage system (with a maximum of 5 million yen).
As the application amount reached the budget amount in Reiwa 8, the recruitment was 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 Related to Solar Panel and Battery Installation, Click Here
⇧Service Menu | For Costs Related to 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.
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). 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 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 priced between 800,000 JPY and 1,200,000 JPY for 3-5 kW, and between 1,200,000 JPY and 1,900,000 JPY for 6-10 kW. (These are just estimated prices and may vary based on factors such as wiring length, scaffolding area, existing roofing materials, and panel layout.)
▶ Installation Menu | Costs for Solar Panel Installation and Battery Installation
Items to Check on the Estimate (Cost Confirmation)
When comparing estimates, it is 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, and total installation capacity (kW) should be listed. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also confirm if it is a type that controls the battery together. |
| 3. Battery | Manufacturer, model number, capacity (kWh), range usable 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 method of securing it (whether it is a method that drills holes or a method that clamps and secures). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, and whether there is a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at 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 it is simultaneous with roof work or exterior painting, confirm that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar water heaters or old panels and 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 and Loss Simulator for Solar Power Generation
With the simulator above,
you can get an estimated quote and a financial 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 an estimated quote and financial simulation!
*The simulation results are estimates. Actual financial results may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Feedback
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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 class |
| Base Mounting Hardware Used |
| Niigata Manufactured / 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 subsidy being granted, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The subsidy 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 subsidies are available, and I would like to know how much will 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 subsidies to be granted, and we explained this 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 companies that serve Atsugi City, Kanagawa Prefecture, and you may be unsure which company to choose.
Therefore, when requesting solar panel installation and battery storage installation work, let’s confirm the following 4 points.
● Have extensive knowledge not only of solar panels but also of roofs
● Confirm the presence of warranties and aftercare maintenance
● Obtain estimates from multiple companies (3 companies as a guideline)
● Check if they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable company.
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 due to insufficient verification of roofs and waterproofing
・Solar panels installed on a severely deteriorated roof causing leaks
・Solar panels installed on a roof with a short lifespan, requiring renovations for removal and reinstallation within a few years
・Misjudging the type of waterproofing and applying incorrect treatment, resulting 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 presence of warranties and aftercare maintenance
When choosing a solar installation company, let’s confirm the presence of warranties. It is important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
While the solar panels and battery storage units come with a manufacturer’s warranty, also check for the presence of a workmanship warranty in case leaks occur after installation!
For companies that offer a workmanship warranty, if leaks occur after installation, they may cover the repairs under the warranty, provided it falls within the warranty period and conditions.
Additionally, some contractors offer after-sales service separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Changes or damage on the roof can occur in areas that are not visible, so there is a possibility that customers may not notice them.
By conducting inspections in after-sales maintenance, we can easily prevent major repairs or failures by discovering abnormalities early!
Kakeru Koumuten Co., Ltd. provides a 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 renovations are performed.)
We also conduct after-sales maintenance and send out annual DM!
Please check the DM, and if you wish, we will come to perform after-sales maintenance!
Obtain estimates from multiple contractors (3 companies is 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-sales 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-sales services”
and make detailed comparisons to make your judgment! If the quality of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid judging solely based 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.
For systems like the Kanagawa Prefecture housing subsidy, where applications cannot be submitted by the contractor and must be done by the individual, it is reassuring to have a contractor that supports the preparation of necessary documents and the flow of procedures.
Be sure to 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 the subsidy will be granted after review! (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 Power Systems
The benefits of installing solar panels are as follows!
Benefit 1: Economic Advantages
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 gain benefits by reducing the electricity you buy from power companies through self-consumption of generated power!
As electricity prices 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 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 and Energy | For purchase prices, periods, etc., click here
Benefit 2 Utilizing Subsidies!
Subsidy conditions and amounts vary by prefecture and municipality, but if you meet the criteria, you may be able to utilize subsidies!
Reducing the actual burden through subsidies is a significant advantage!
In the case of Atsugi City, there may be programs from the national government, Kanagawa Prefecture, and Atsugi City that are applicable. 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 such as power conditioners may have operational noise.)
Benefit 4 Expect Heat Insulation Effects!!
By installing the panels on the roof or rooftop, they 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 insulation performance of the building itself.)
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it becomes 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.
(Note that 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 are incurred
A particularly easy-to-overlook 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 deteriorating, 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 ask for a simulation that considers 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 in methods that fix hardware to the roofing material or substrate with screws, 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, replacing the roofing material with a metal roof and fixing the solar panels using the catch method is also an option. (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 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!
How to Choose 1: Compare by Total Roof Output
When installing solar panels on the roof, it is important to consider how much electricity can be generated in a limited area, and it is always better to generate more electricity!
The sizes and outputs of solar panels vary by manufacturer.
A 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
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 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 one 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 amount (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
How to Choose 2: Compare by Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases over 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.
By not deciding solely based on initial output and considering the degradation rate, you can choose solar panels without regrets!
How to Choose 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!
Since a longer warranty is generally better, let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar 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 roof condition. 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 for different capacities are available 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 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. Kanagawa Prefecture’s subsidies (70,000 yen/kW for solar and 150,000 yen/unit for storage batteries) are approaching the application deadline for the second term of Reiwa 8, and the national DR household storage battery project has ended its public recruitment. Please check each official page for future applications.
Since the application status may change, please refer to the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies even 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 Kanagawa Prefecture’s 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.
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 construction method, and when securing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten Co., Ltd. is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation and suggest methods such as roof overlay (cover method) or re-roofing if deterioration is progressing.
My roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. If a roof renovation is needed within 10 to 20 years after installation, there will be additional costs for removing and reinstalling solar panels. 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 checking the condition of the roof during the on-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 beneficial 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 battery” using a financial simulation.
How many kW can I install 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 Co., Ltd., we create a layout diagram based on the drawings and on-site survey, and provide you with the installation capacity and power generation simulation.
Atsugi City has a varied terrain from flat land along the Sagami River to hilly areas and mountainous regions, and the shadows cast by neighboring houses, trees, and elevation differences vary from one house to another. You can check the expected power generation through the power generation simulation.
How long will the construction take?
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.
Additionally, please note that there will be a separate period 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 (less than 10 kW), from the certification after October 2025, the first 4 years will be 24 yen/kWh, and from the 5th to the 10th year will be 8.3 yen/kWh, and the same price will apply for the 2026 fiscal year.
The idea is to recover the initial costs quickly in the first 4 years and then focus on self-consumption. Kakeru Koumuten Co., Ltd. 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 Co., Ltd. sends out annual after-maintenance DM notifications and visits for inspections upon request from customers. We can also clean solar panels with a special brush if the power generation decreases due to dirt.
The roof is a part that is difficult to check by yourself, so if you have any concerns, please feel free to consult us.
Can you also handle renovations of roofs that already have solar panels installed?
Yes, it is possible. Kakeru Koumuten Co., Ltd. can detach and reattach solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them consistently. The removed panels can be stored in our own warehouse.
For costs, please refer to the solar panel detachment and 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, roof work, and exterior wall work in Atsugi City, Kanagawa Prefecture.
We have received requests from many customers, including renovation companies and real estate companies, who have contacted us!
Kakeru Koumuten promises “high-quality renovations at low cost”, and we have received positive feedback from many 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 wall cover methods.
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 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 best construction plan!
We are confident that we will not be outdone in terms of cost, quality, and planning compared to other companies in exterior work!
We welcome competitive estimates with confidence!
Estimates are completely free, and if you find our company to be inferior to others, you are free to decline!
Characteristics of Atsugi City, Kanagawa Prefecture and Points of Solar Work
Atsugi City is located almost in the center of Kanagawa Prefecture, with the Sagami River flowing on the east side and hilly and mountainous areas spreading to the west. The flat land along the Sagami River is where the urban area expands, 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 construction
■ Check sunlight exposure according to the location of the house, from flat land to hilly and mountainous areas
Atsugi City has an urban area spreading along the flat land by the Sagami River, while hilly and mountainous areas extend to the west. Depending on the location, the surrounding buildings, trees, elevation differences, and the silhouette of the mountains affect the shadows, changing the sunlight exposure in the morning and evening. Kakeru Koumuten Co., Ltd. creates layout diagrams based on the drawings and the actual site conditions, allowing you to check with a power generation simulation.
■ In low-lying areas along the Sagami River, also check the installation location of equipment
If you live in low-lying areas such as along the Sagami River, it is reassuring to check the flood risk of your location on a hazard map when deciding on the installation location for storage batteries and power conditioners. In mountainous or sloped areas, the relationship with slopes and retaining walls should also be confirmed. We will propose installation locations considering wiring routes and ease of inspection.
■ Near mountains or trees, consider fallen leaves and shadows
In residential areas near the mountains towards Tanzawa or in tree-dense neighborhoods, you may be affected by fallen leaves and branches. If dirt such as fallen leaves or dust accumulates on the roof, it may affect the power generation, so it is important to consider the arrangement of the panels and the 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 important to ensure that waterproofing is properly done at the fixed parts to prevent rainwater from entering through the mounting points. In elevated or open areas that are easily affected by wind, we will also check the mounting frames and methods.
■ Check the status of the city’s subsidy on the official page for application status and procedures
Atsugi City’s Housing Energy Saving Equipment Installation Promotion Subsidy (Atsugi City Carbon Neutral Platform) is a system that accepts applications within the budget. Since there are specific application periods, procedures, and conditions for additional subsidies, it is important to check in advance along with the timing of the construction.
■ Confirm the roof condition according to the age of the building
For houses 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 help 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 Tokyo.
List of Areas in Atsugi City, Kanagawa Prefecture
Atsugi City Aikou/Atsugi City Aikou Nishi/Atsugi City Aikou Higashi/Atsugi City Ainama/Atsugi City Asahimachi/Atsugi City Atsugi/Atsugi City Atsugi-machi/Atsugi City Azumacho/Atsugi City Iiyama/Atsugi City Izumimachi/Atsugi City Oikawa/Atsugi City Oji/Atsugi City Okada/Atsugi City Okazukokuu/Atsugi City Ono/Atsugi City Onna/Atsugi City Kaneda/Atsugi City Kamiyachida/Atsugi City Kamiogino/Atsugi City Kamiochiai/Atsugi City Kamifurusawa/Atsugi City Kotobuki-machi/Atsugi City Saiwaicho/Atsugi City Sakai/Atsugi City Sakaemachi/Atsugi City Sarugashima/Atsugi City Mita/Atsugi City Mita Minami/Atsugi City Shimoichida/Atsugi City Shimoogino/Atsugi City Shimokawairi/Atsugi City Shimotsukokuu/Atsugi City Shimofurusawa/Atsugi City Sekiguchi/Atsugi City Tanazawa/Atsugi City Tamuramachi/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 Nakaiichida/Atsugi City Nakaiogino/Atsugi City Nakacho/Atsugi City Naganuma/Atsugi City Nanazawa/Atsugi City Onsen/Atsugi City Onsen Nishi/Atsugi City Nagahase/Atsugi City Hayashi/Atsugi City Higashimachi/Atsugi City Funako/Atsugi City Matsue/Atsugi City Matsukage-dai/Atsugi City Mizuhiki/Atsugi City Midorigaoka/Atsugi City Minamimachi/Atsugi City Miharu no/Atsugi City Miya no Sato/Atsugi City Mouri-dai/Atsugi City Motomachi/Atsugi City Mori no Sato/Atsugi City Mori no Sato Aoyama/Atsugi City Mori no Sato Wakamiya/Atsugi City Yamagiga
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・Kakeru Koumuten Co., Ltd. project achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. service 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 included!
・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 included!
・Check out our solar power generation estimates 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!
