Leave the installation of solar panels in Miura City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
For solar panel and battery installation in
Miura 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 withsolar panel and battery installation considering roofing and waterproofing!
“How to Choose a Solar Panel Contractor in Miura City”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Miura 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 obtainingthree or so estimates!
Table of Contents (tap to open/close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Miura City, Kanagawa Prefecture
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Miura 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 Miura 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 Miura City
- If You Are Looking for a Solar Panel Installation Company in Miura City, Contact Kakeru Koumuten
- Characteristics of Miura City, Kanagawa Prefecture, and Points for Solar Construction
- Service Area in Miura City, Kanagawa Prefecture
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Miura City, Kanagawa Prefecture
The reasons why our company is entrusted with solar panel installation by customers in Miura 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 imitated 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 estimates from any number of companies!
1. We Can Also Handle Exterior Renovations Besides Solar Panel Installation!
Issues 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 may be 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 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 has prepared 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 according to 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 own scaffolding materials for approximately 50 houses!
Even in Miura City, where the environment varies widely from plateaus and hilly areas to coastal residential areas, our in-house scaffolding team will plan the scaffolding according to the local conditions.
Storage of Materials in Our Large Warehouse
We store roofing materials and paints, and we can also store removed solar panels.
By ordering a large quantity of materials at once, you canpurchase materials at a lower cost!
Additionally, we always have a stock of roofing materials, so we canrespond 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 roofing materials!
We can also provide simulations of potential earnings and installation costs when introducing solar panels!
Since roofing and exterior wall work are often involved, we also have samples of roofing materials and models that explain the structure, allowing for 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 while providing 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 to exterior wall painting and roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry licenses as well as permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting specialists on staff, and we are confident in our construction techniques.
We can also handle large-scale roofing projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation work, we also provide our own construction warranty (leakage warranty)!
(The construction warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, it may not be possible to provide a warranty without performing a roof renovation. The construction warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary depending on the warranty details.)
Aftercare is available every year, and we send out notification DM each 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!
During leak investigations, we can also conduct surveys 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 enhance skills, we create various roofing models and conduct practical training.
Since the installation methods vary depending on the shape and slope of the roof, we regularly provide technical training to ensure that all staff 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.
Profit and loss simulations can be created for projected cumulative profits and losses over 20 to 30 years.
For customers who are not familiar with solar installations, we compile easy-to-understand materials that include 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 to 30 years.
Confirming whether it is safe to install them directly on the current roof before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | The fixing method varies depending on the roofing material, such as slate, tiles, metal roofs, and 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 will affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 3. Orientation, Slope, and Shadows of the Roof | The orientation and slope of the roof surface, as well as shadows from neighboring houses, trees, and utility poles, will affect the power generation. We will create a layout diagram from the drawings and the site, and you can confirm it with a power generation simulation. |
| 4. Shape of the Roof and Usable Area | The number of panels (installation capacity) that can be placed depends on 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 check whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The fixing method varies by technique, so please confirm the waterproofing treatment of the fixed 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. Installation Location of Equipment and Wiring | We will confirm 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 will also affect 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 fixed 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 secure 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 lightweight roofing material 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 renovate the roof 10 to 20 years after installation, additional costs for removing and re-installing solar panels will apply. 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 re-installation of solar panels in-house, so please consult us according to the condition of your roof!
▶ Click here for roof renovations in Miura City, Kanagawa Prefecture
PotentialSubsidies and Grants
If you introduce solar panels or storage batteries in Miura City, you may be eligible for programs from the “National Government,” “Kanagawa Prefecture,” and “Miura 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 |
|---|---|---|---|
| Miura City “Key Measures Acceleration Project Subsidy” (for households, self-owned) | Individuals installing equipment in their own homes within the city (must not have any tax arrears). Equipment that does not receive FIT or FIP certification and consumes more than 30% of the generated electricity for self-use. Storage batteries are only eligible if introduced simultaneously with solar power (storage batteries alone are not eligible). Pre-construction before the city’s grant decision is generally not allowed. | Solar Power: 70,000 JPY/kW (amounts under 1 kW are rounded down) Storage Battery: 1/3 of the storage system + construction cost (excluding tax) (up to 141,000 JPY/kWh) |
Applications accepted from May 1, 2026, to January 15, 2027 (first-come, first-served; ends when budget is reached) The budget amount is 10,569,000 JPY, and as of October 2, 2026, the application amount is 6,432,000 JPY. |
| Kanagawa Prefecture “FY2026 Kanagawa Prefecture Residential Solar Power and Storage Battery Installation Subsidy” | For single-family homes or multi-family residences in the prefecture, the installation of both solar power and storage batteries in homes that ensure seismic performance. Applications must be made by the individual, and construction can only begin after grant approval. | Solar Power: 70,000 JPY/kW Storage Battery: 150,000 JPY/unit |
Phase 1: May 11, 2026, to June 30, 2026 Phase 2: September 7, 2026, to 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” (FY2025 Supplement) | Newly introducing home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on an initial effective capacity of 34,500 JPY per 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 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 the structure; applications cannot be made for the installation of storage batteries alone. Solar panels are not included as eligible facilities. | Storage Battery: 96,000 JPY/unit | Ends as soon as the budget cap is reached. Please check the official site for application status. |
| Kanagawa Prefecture “FY2026 Kanagawa Prefecture Self-Consumption Renewable Energy Installation Subsidy” | Corporations and individuals filing blue returns (individual homes are not eligible). Solar power must have a generation output of 10 kW or more, for business facilities, and equipment that does not receive FIT or FIP certification, etc. | Solar Power: 80,000 JPY/kW, etc. Storage System: 50,000 JPY/kWh (up to 5,000,000 JPY) |
Recruitment ended on September 3, 2026 (application amount reached the budget amount). |
In Miura City, the principle is that construction cannot begin before the city’s grant decision, and for Kanagawa Prefecture’s housing subsidies, the condition is that construction must start after receiving the “grant decision”. If construction begins beforehand, it may be excluded from eligibility. Additionally, for Miura City’s subsidies, it is a condition that the equipment does not receive FIT or FIP certification and consumes more than 30% of the electricity generated for self-consumption. The possibility of combining city and prefectural subsidies needs to be confirmed for each system. It is not guaranteed that a grant will be awarded upon application, so please confirm before contracting and starting construction.
Kakeru Koumuten Co., Ltd. will provide guidance on eligibility conditions and business requirements for each system after confirming them.
Miura City “Accelerated Measures Subsidy for Project Costs” (Solar Power Generation Equipment and Storage Batteries)
In Miura City, subsidies are provided for those who install solar power generation equipment or storage systems on their own residential or business properties. The condition is that there are no outstanding municipal taxes, and equipment that does not receive FIT or FIP certification and consumes more than 30% of the electricity generated for self-consumption is eligible.
The subsidy amount for households is 70,000 yen per kW for solar power generation (the equipment output is rounded down to the nearest whole kW), and for storage batteries, it is one-third of the storage system and construction costs (excluding tax) with a maximum of 141,000 yen/kWh. Storage batteries are eligible only when installed simultaneously with solar power, and installations of storage batteries alone are not eligible.
Applications will be accepted from May 1, 2026, to January 15, 2027, and will end on a first-come, first-served basis once the budget is reached. The budget amount is 10,569,000 yen, and as of October 2, 2026, the application amount is 6,432,000 yen. Pre-construction before the city’s grant decision is generally not allowed, so it is important to confirm the timing of construction and the order of applications before contracting.
👉 Click here for the official Miura City page
National Subsidy “DR Home Storage Battery Project (Support for the Introduction of Home Storage Systems for DR Resources)”
The national government has been implementing the “DR Home Storage Battery Project” to support the installation of home storage batteries.
This program targets those who are introducing new storage systems of registered products that can be utilized for demand response (DR), and for the fiscal year 2025 supplementary budget, 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 also conditions such as that contracts or orders made before the grant decision are not eligible.
However, the fiscal year 2025 supplementary budget reached its application budget on May 29, 2026, and the public offering has ended (the previous fiscal year’s supplementary budget also ended on July 2, 2025). Applications are currently not possible, so please check the official site for future public offerings.
Currently, there are no confirmed subsidies from the national government specifically for the installation of solar panels on existing homes.
👉 Click here for the official DR Home Storage Battery Project website
Kanagawa Prefecture “Reiwa 8 Subsidy for Residential Solar Power Generation and Storage Battery Installation Costs”
In Kanagawa Prefecture, subsidies are provided for those who install both “solar panels” and “storage batteries” together in their homes.
The subsidy amounts are 70,000 yen per kW of solar power generation output and 150,000 yen per storage system.
For example, if you install a 4kW solar panel and one storage battery, the subsidy amount would be calculated as 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 ineligible, and the application must be made by the individual (applications by contractors on behalf are not allowed). The eligible homes must also ensure seismic performance. Please check each subsidy program for compatibility with other subsidy systems, as this may vary.
For Reiwa 8, the first application period (May 11 – June 30) and the second application period (September 7 – September 30, first-come-first-served) have been conducted, and the second period is now closed. For future applications, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Kanagawa Prefecture “Reiwa 8 Subsidy for Self-Consumption Type Renewable Energy Installation Costs” (for businesses)
Kanagawa Prefecture is also implementing subsidies for businesses that install “self-consumption type” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners filing blue returns, and installations in individual homes are 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 of solar power generation and 50,000 yen per kWh for the accompanying storage system (with a maximum of 5 million yen).
As of Reiwa 8, the application amount has reached the budget limit, and applications were closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings in Miura City should check the official page of Kanagawa Prefecture for the next application period.
👉 Click here for details
Solar Panel Installation and 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 (kilowatts). Batteries are compared based on the amount of electricity they can store, represented in kWh (kilowatt-hours).
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 yen to 1,200,000 yen for 3-5 kW, and 1,200,000 yen to 1,900,000 yen for 6-10 kW. (These are approximate amounts and may vary based on wiring length, scaffold 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) are specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also confirm whether it is a type that controls the battery together. |
| 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 clamping). |
| 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. |
| 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 | Extent of support for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roof work and exterior painting are done simultaneously, check that the same scope and quantity are not double counted. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal 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 Simulation for Solar Power Generation
With the simulator above,
you can obtain an approximate 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 an approximate estimate and profit simulation!
*The simulation results are approximate. 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 using catch type hardware gripping the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY *Due to the grant 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 |
| Approximately 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that grants are available, and I would like to know how much can be provided. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels based on the drawings!
The layout diagram shows the arrangement when solar panels are 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 grant amount, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Miura City, Kanagawa Prefecture
There are many solar panel installation contractors available in Miura City, Kanagawa Prefecture, and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and storage battery installation work, let’s confirm the following 4 points.
● Have extensive knowledge not only about solar panels but also about roofs
● Check for warranties and after-sales maintenance
● Obtain estimates from multiple contractors (3 companies as a guideline)
● Confirm whether they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable contractor.
Knowledge about roofs as well as solar panels
Improper installation of solar panels can be caused by a lack of knowledge and verification regarding roofs and waterproofing.
While knowledge about solar panels is certainly important, understanding the roof and waterproofing at the installation site of the solar panels is also crucial.
⚠︎Examples of troubles caused by insufficient checks on roofs and waterproofing
・Solar panels installed on a deteriorated roof causing leaks
・Solar panels installed on a roof with a short lifespan, requiring reinstallation within a few years
・Incorrect treatment due to misjudging the type of waterproofing, leading to 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 Check Before Installing Solar Panels” in this article
Check for warranties and after-sales maintenance
When choosing a solar installation contractor, let’s confirm the presence of warranties. It is important to check not only the duration of the warranty but also the scope, exclusions, and cost conditions.
While the solar panels and storage batteries come with a manufacturer’s warranty, also check for the presence of a workmanship warranty in case leaks occur after installation!
For contractors that offer a workmanship warranty, if leaks occur after installation, they may cover the repairs under the warranty, provided it is 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, we can detect abnormalities early, making it easier to prevent major repairs or failures!
Kakeru Koumuten Co., Ltd. provides a rain leak warranty as a workmanship guarantee for solar panel installations. (The warranty for solar panel installation is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty unless a roof renovation is performed.)
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 work 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”
“Warranty and after-service”
and make detailed comparisons to make your judgment! If the rank of auxiliary materials is low or if processes 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 Kanagawa Prefecture’s housing subsidies, where contractors cannot apply on behalf of the client, it is reassuring to have a contractor who can support 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 the flow will go through a review before the grant is provided! (The flow of procedures varies by system)
▶ Go to “Possible Subsidies and Grants in Miura City” within this article
Benefits of Introducing Solar Power Equipment
The benefits of introducing solar panels are summarized in the following 5 points!
Benefit 1: Economic Benefits
The biggest benefit of introducing solar panels is the economic advantage!
The selling price of electricity has decreased compared to 10 years ago, but by consuming the generated electricity, you can reduce the amount of electricity purchased from the utility company and gain benefits!
As electricity prices rise, the ability to cover your consumption with solar power becomes attractive!
If you plan to use the generated electricity at night, installing a storage battery is essential!
For residential use (under 10kW), the selling price (FIT) from certifications after October 2025 is set at “24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year.” The same price will apply for the 2026 fiscal year. After the 5th year, it is often more advantageous to use it at home (self-consumption) rather than selling it, making the combination with a storage battery a viable option.
👉 Ministry of the Environment | For purchase prices and periods, 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 through subsidies is a significant advantage!
In the case of Miura City, there may be subsidies available from the city and Kanagawa Prefecture, so please check the latest application status.
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 on the roof or rooftop, the panels block direct sunlight to the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
(Note: This does not improve the insulation performance of the building itself.)
Benefit 5: Electricity can be used even during power outages!!
If a storage battery is installed, it is possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation capability, you may be able to use electricity from a dedicated outlet during daytime generation.
(Note: 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 maintenance cost that is particularly easy to overlook is the roof where the solar panels are installed.
If you perform roof remodeling 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 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 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 fixing brackets to the roofing material or substrate with screws, waterproofing of the fixed parts is crucial.
If the method involves making holes in the roof, there will inevitably be a risk of leaks.
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 the brackets, 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, one option may be to replace it with a lighter roof if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply the case that “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 based on total roof output
When installing solar panels on the roof, it is important to know how much electricity can be generated in a limited area, and the more electricity generated, the better!
Solar panels vary in size and output depending on the manufacturer.
For example, 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 the orientation, slope, and shading of the roof.
How to Choose 2: Compare based on degradation rate of solar panels
Solar panels have a degradation rate, and their output gradually decreases after 10 years and 20 years.
The degree of output reduction after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or electricity generation amount.
By considering the degradation rate as well as the initial output, you can choose solar panels without regrets!
How to Choose 3: Compare based on 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 offer a 10-year warranty, so it varies!
Longer warranties are better, so be sure to check the warranty period and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Miura City
We have compiled common questions from customers considering the installation of solar panels and storage batteries in Miura City. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Miura 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 for different capacities are published on the solar panel and storage battery installation pricing page. We will create a layout diagram based on the drawings and site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Miura City?
As of October 6, 2026, Miura City’s “Priority Measures Acceleration Project Subsidy” (for households: 70,000 yen/kW for solar power and one-third of the cost with a maximum of 141,000 yen/kWh for storage batteries) is available on a first-come, first-served basis (as of October 2, 2026, the application amount was about 60% of the budget). Kanagawa Prefecture’s 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 period of fiscal year 2026, and the national DR household storage battery project has ended its public recruitment.
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 after the construction is completed?
In many programs, procedures are required before construction. Miura City’s subsidy states that “preliminary work cannot begin before the city’s grant decision,” and Kanagawa Prefecture’s subsidy requires “construction to begin after the grant decision,” meaning that if you install it beforehand, you may be excluded from eligibility.
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 the panels varies by construction method, and when securing brackets to the roofing material or substrate, waterproofing treatment for the fixed parts is essential.
Kakeru Koumuten 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 replacement if deterioration is advanced.
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 10 to 20 years after installation, the cost of removing and reinstalling the solar panels will be incurred separately. If the remaining lifespan of the roof is short, renovating to a highly durable roofing material before installation may reduce total costs.
Please consult us on how to proceed with the installation after confirming the condition of the roof during the on-site survey!
Is it better to install a storage battery together with 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 in Kanagawa Prefecture requires the simultaneous installation of solar panels and storage batteries, and the subsidy in Miura City is also only applicable when the storage battery is installed at the same time as the solar panels (installation of the storage battery alone is not eligible). You can compare “solar panels only” and “solar panels + storage battery” 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 on-site survey, and provide you with the installation capacity and power generation simulation.
Miura City has a wide range of locations, including northern plateaus, central hilly areas, and coastal residential areas, and the shadows cast by neighboring houses, trees, and elevation differences vary from house to house. 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 roof work is performed simultaneously or depending on the shape of the roof and installation capacity.
Please note that additional time is required for applications for subsidies and to the power company, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (under 10 kW), the rate 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 the initial costs 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 DM and visits customers who wish to have inspections. We can also clean solar panels with a special brush if the power generation decreases due to dirt.
Since it is difficult to check areas on the roof by yourself, please feel free to consult us if you have any concerns.
Can you also handle renovations of roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten 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 all in one go. The removed panels can be stored in our own warehouse.
For costs, please refer to the solar panel removal and water heater removal pricing page.
If you are looking for a solar panel installation company in Miura City, please consult Kakeru Koumuten
Our company handles a wide range of exterior renovations, including solar panels, roofing work, and exterior wall work in Miura City, Kanagawa Prefecture.
We have received requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received positive feedback from numerous customers.
We continue to update our construction achievements 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 cover method for exterior walls.
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 temporary measures without setting up scaffolding, as long as safety can be ensured, so please consult with 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 optimal 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 for exterior work compared to other companies!
We welcome competitive quotes because we are confident!
Estimates are completely free, and if you find our company lacking compared to others, feel free to decline!
Characteristics of Miura City, Kanagawa Prefecture, and Points for Solar Construction
Miura City is located at the southern tip of the Miura Peninsula, which separates Tokyo Bay and Sagami Bay. According to official city materials, the area is approximately 31 km², and the coastline, which features sandy beaches, rocky shores, and inlets, is about 42.9 km long.
Below are the characteristics of Miura City and points to consider when installing solar panels and storage batteries. (Tap to open)
View the characteristics of Miura City and points for solar construction
■ A city surrounded by the sea. Check installation conditions for homes near the sea
The appearance of Miura City (official city materials) states that Miura City is located at the southern tip of the Miura Peninsula, which separates Tokyo Bay and Sagami Bay, with a coastline of about 42.9 km. In areas close to the sea, the installation conditions for salt damage areas set by manufacturers vary by model. We will check the installation location and model conditions together during the estimate.
■ A region with strong winds. Check the fixing method of the panels and the mounting frame
According to official documents from the same city, Miura City is also known for strong winds. When installing panels on the roof, it is important to securely fasten them with appropriate fittings for the roofing material and ensure waterproofing treatment at the fastening points. In locations prone to wind effects, it is also necessary to check the specifications of the mounting frame and the fastening methods.
■ Plateau and Hilly Areas. Check Shadows for Each House
The same document states that the northern part of the city is the Miyata Plateau, while the central part is the Hikihashi Hills (approximately 80m above sea level). The locations of residences vary widely, including plateaus, hilly areas, and coastal regions, and the way shadows are cast by surrounding buildings, trees, and elevation differences differs from house to house.
At Kakeru Koumuten, we create layout diagrams based on the blueprints and the actual site conditions, allowing you to confirm through a power generation simulation.
■ Average Annual Temperature 16.2℃, Annual Precipitation Approximately 1,000 to 2,000mm
According to the city’s official documents, the average annual temperature in Miura City is 16.2℃, characterized by warm winters and relatively low summer temperatures. The annual precipitation is approximately 1,000 to 2,000mm. Since there are periods of heavy rain, it is crucial to ensure waterproofing treatment at the fastening points when installing on the roof.
■ City Subsidies are First-Come, First-Served. Applications Before Starting Work
Miura City’s Priority Measures Acceleration Project Subsidy (Official City Site) will be accepted on a first-come, first-served basis from May 1, 2026, to January 15, 2027, and will end once the budget is reached. In principle, pre-commencement before the city’s grant decision is not allowed, so it is important to confirm the timing of the work and the order of applications before signing the contract.
■ Check the Roof Condition According to the Age of the Building
For residences that have been built for several years, it is important to check the condition of the roofing material 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 reinstalling solar panels.
■ Be Cautious of Dirt from Sea Breeze, Salt, Dust, and Fallen Leaves
If dirt such as dust and fallen leaves accumulates on the roof, it may affect power generation. Kakeru Koumuten can also handle cleaning solar panels with specialized brushes and rain gutter cleaning.
Our company is based in Kanagawa Prefecture and has undertaken many exterior construction and solar projects in Miura 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 urgent issues!
Service Area in Miura City, Kanagawa Prefecture
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and all of Tokyo.
List of Areas in Miura City, Kanagawa Prefecture
Onoe-cho, Miura City / Kaigai-cho, Miura City / Misaki-hikari-cho, Miura City / Sakae-cho, Miura City / Shiraishi-cho, Miura City / Shiroyama-cho, Miura City / Suwa-cho, Miura City / Tenjin-cho, Miura City / Hatsuse-cho Irie, Miura City / Hatsuse-cho Koenbo, Miura City / Hatsuse-cho Shimomiya, Miura City / Hatsuse-cho Mito, Miura City / Hatsuse-cho Wada, Miura City / Hara-cho, Miura City / Harumi-cho, Miura City / Higashioka-cho, Miura City / Misaki, Miura City / Misaki-cho Koajiro, Miura City / Misaki-cho Jogashima, Miura City / Misaki-cho Rokuai, Miura City / Misaki-cho Moriso, Miura City / Minamishitoura-cho Kaneda, Miura City / Minamishitoura-cho Kamimiya, Miura City / Minamishitoura-cho Kikuna, Miura City / Minamishitoura-cho Bishamon, Miura City / Minamishitoura-cho Matsuwa, Miura City / Miyakawa-cho, Miura City / Mukogasaki-cho, Miura City
・Leave your exterior wall painting in Miura City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
・Leave your roof renovation in Miura City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
・Leave your exterior renovation in Miura City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
・Kakeru Koumuten Co., Ltd.施工実績
・Kakeru Koumuten Co., Ltd. After Maintenance
・Kakeru Koumuten Co., Ltd.施工メニュー・料金表
・Kakeru Koumuten Co., Ltd. Staff Blog & Announcements
・Explaining the Importance of Comparing Estimates!
・Top 12 Solar Power Generation Manufacturers! Features and Selection Points!
・What are the installation costs for solar power generation? Tips to Reduce Costs!
・What are the best locations for installing solar power generation? Points for Selecting Installation Locations!
・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!
