Leave Your Solar Panel Installation Work in Miyamae, Kawasaki City to Kakeru Koumuten Co., Ltd.!
For solar panel and battery installation in
Miyamae Ward, Kawasaki City,
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 Miyamae Ward”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Miyamae Ward”
We will also explain the above three points!
Installing solar panels carries risks such as“the occurrence of leaks” and other troubles.
To ensure you have no regrets about your solar panel installation, we recommend gettingcomparative estimates from about three companies!
Table of Contents (tap to open/close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Miyamae Ward, Kawasaki City
- Roof Inspection Before Installing Solar Panels
- Subsidies and Grants That May Be Available in Miyamae Ward
- 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 Miyamae Ward, Kawasaki City
- 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 Miyamae Ward
- If You’re Looking for a Solar Panel Installation Company in Miyamae Ward, Contact Kakeru Koumuten
- Characteristics of Miyamae Ward, Kawasaki City and Points for Solar Construction
- Service Area in Miyamae Ward, Kawasaki City
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Miyamae Ward, Kawasaki City
The reasons why our company is entrusted with solar panel installation by customers in Miyamae Ward, Kawasaki City include
one reason being that “Kakeru Koumuten has a base in Kanagawa Prefecture”,
and we have “strengths in solar panel installation that cannot be imitated by other companies”, which has 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!
Troubles such as leaks that occur during solar panel installation may be caused by insufficient checks of 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.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has organized the following warehouses and material storage areas to provide low-cost, high-quality solar and exterior renovation work.
We have established five bases centered around 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 scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs on scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
Even in the residential areas of Miyamae Ward, which spread across hilly terrain, our own scaffolding team will plan the scaffolding to suit 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 roofing materials in stock, so we canrespond quickly in emergencies!
Sorting and transporting waste materials in-house
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut waste disposal costs.
Exterior remodeling 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!
Simulations for potential earnings and installation costs when introducing solar panels are also available!
Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that illustrate 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 roofing renovations at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the same person will manage sales and construction oversight, smooth communication is ensured.
We can perform everything from temporary scaffolding installation to exterior wall painting and roofing renovations with our own team!
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 specialists on staff, ensuring confidence in our construction techniques.
We are capable of handling large-scale roofing projects such as those for factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation, we also provide 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, a roof renovation may be required to provide the warranty. 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 every year, and we send out annual notification DM.
If you have any questions about the warranty, please click on the image above!
6. Flexible and Prompt Response
Our company is equipped to handle various roof troubles and situations.
Even if we cannot access the roof at high altitudes, we can respond using a drone!
During leakage investigations, we can also conduct surveys 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
We create various roof models for skill enhancement and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training to ensure that each staff member can handle various cases.
8. Creation of Clear Materials and Simulations
At Kakeru Koumuten, we provide not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar installation guidebook” and a “profit and loss simulation” that takes into account loan interest rates and electricity costs.
The profit and loss simulation can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar installations will find the materials easy to understand, 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 to 30 years.
Confirming whether it is safe to install them directly on the current roof is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, specializing in roofing, 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 will 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, will affect power generation. We will 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 based on their size, so we will compare the overall output of the roof. |
| 5. Fixing method and waterproofing details | We will confirm whether the method involves drilling holes in the roofing material or securing it with brackets. The fixing method varies by technique, so please check the waterproofing treatment of the fixing 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 will check the installation locations for the power conditioner and storage batteries, as well as the wiring route to the distribution board. The length of the wiring will also affect costs. |
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 with screws to the roof material and substrate) | Waterproofing treatment of fixing parts, cracks or deterioration of slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suitable for the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be methods to replace with lightweight roofing materials before installation. |
| Metal Roof (Horizontal and Vertical) | Fixed with catch-type brackets that grip the roof material (depends on the combination of roof material and brackets) | Whether the roof material and brackets are compatible, installation conditions from the roof material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a 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 removing and reinstalling solar panels. If the roof is deteriorating, renovating to high-durability roofing materials before installation may help reduce costs in the long run.
Kakeru Koumuten Co., Ltd. specializes in roofing work and can also handle the removal and reinstallation of solar panels in-house, so please consult us according to the condition of your roof!
▶ Click here for roof renovations in Miyamae Ward, Kawasaki City
Potential Subsidies and Grants inMiyamae Ward, Kawasaki City, Kanagawa Prefecture
When introducing solar panels and storage batteries in Miyamae Ward, there is a possibility of being eligible for programs from the “National Government,” “Kanagawa Prefecture,” and “Kawasaki City.”
The following information is based on the official pages of each program as of October 6, 2026. The application status may change depending on the budget, 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 |
|---|---|---|---|
| Kawasaki City “Reiwa 8 Year Solar Power Generation Equipment Installation Subsidy” (for individual residences) | Individuals residing (or planning to reside) in homes within the city. Projects started before receiving the grant decision notice are not eligible. Can be combined with national and Kanagawa Prefecture subsidies. | Solar Power (non-FIT): 70,000 JPY/kW (maximum 280,000 JPY per case) Solar Power (FIT applicable): 40,000 JPY per case Storage Battery: 100,000 JPY/kWh (non-FIT interconnection maximum 700,000 JPY per case, FIT applicable interconnection maximum 300,000 JPY per case) |
April 24, 2026 – December 28, 2026 Early termination possible depending on budget status (as of September 30, 2026, 49% of the total budget has been executed according to the official page). |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Introduction Subsidy” | Must install both solar power generation and storage batteries in a residence within the prefecture. Applications must be made by the individual, and construction must begin after the grant decision. | Solar Power: 70,000 JPY/kW Storage Battery: 150,000 JPY per unit |
Phase 1: May 11, 2026 – June 30, 2026 Phase 2: September 7, 2026 – September 30, 2026 (first-come, first-served) Phase 2 has reached its application deadline. Please check the prefecture’s official page for future recruitment. |
| National “DR Home Storage Battery Project” (Reiwa 7 Year Supplement) | Newly introduce home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on an initial effective capacity of 1 kWh at 34,500 JPY (subsidy rate within 30% and maximum 600,000 JPY per application). | As of May 29, 2026, the budget has been reached, and the 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 JPY per household | Ends as soon as the budget limit is reached. Please check the official site for application status. |
| Kawasaki City “Eco Support Subsidy for Local Businesses” (Reiwa 8 Year) | Small and medium-sized businesses with (or newly establishing) a business location within the city (individual residences are not eligible). Solar power generation must be less than 50 kW, and for 10 kW or more, it must be for self-consumption only. | One-third of eligible expenses (maximum 2,000,000 JPY) If solar power generation is included, an additional 10,000 JPY per kW (maximum 200,000 JPY) will be added. |
April 1, 2026 – January 12, 2027 Applications will close once the budget limit is reached (as of September 29, 2026, the budget execution rate is approximately 70% according to the official page). |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Renewable Energy Introduction Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). Solar power systems must have a generation capacity of 10kW or more, facilities for business use, and equipment not certified under FIT/FIP, etc. | Solar power: 80,000 JPY/kW, etc. Storage systems: 50,000 JPY/kWh (up to 5,000,000 JPY) |
Application period ended on September 3, 2026 (when the application amount reached the budget amount) |
Kawasaki City’s subsidies do not cover projects that started before receiving the “Notice of Grant Decision”. Kanagawa Prefecture’s residential subsidies also require construction to begin after receiving the “Grant Decision”, and grants will be provided after a performance report and review following project completion. The order of procedures varies by program, and applying does not guarantee a grant, so please confirm before contracting or starting work.
At Kakeru Koumuten, we will guide you on eligibility conditions and business requirements for each program after confirming them.
Kawasaki City “Reiwa 8 Fiscal Year Solar Power Generation Equipment Installation Subsidy”
Kawasaki City provides subsidies for individuals installing solar power generation equipment and storage batteries in residential properties within the city. Residents of Miyamae Ward are also eligible.
The subsidy amount for individual residences is 70,000 JPY per kW for solar power generation (not applicable for FIT), with a maximum limit of 280,000 JPY per case, and 100,000 JPY per kWh for storage batteries. The maximum limit for storage batteries is 700,000 JPY per case when interconnected without FIT, and 300,000 JPY per case when interconnected with FIT, while selling solar power under FIT is treated as 40,000 JPY per case. There are also options for ZEH/ZEH Oriented at 250,000 JPY per unit and ZEH+ at 400,000 JPY per unit.
For example, if installing a 4kW solar panel without FIT, the calculation for the solar subsidy would be 4kW × 70,000 JPY = 280,000 JPY (equal to the maximum limit).
Projects started before receiving the Grant Decision Notice are not eligible. It is also possible to combine this with other subsidies implemented by the national government and Kanagawa Prefecture. There are menus available for management associations and owners of condominiums, but simultaneous application for subsidies for charging facilities for electric vehicles is a condition.
The application period for the Reiwa 8 fiscal year is from April 24, 2026, to December 28, 2026, and may end early depending on budget conditions. For detailed eligibility conditions and application methods, please check Kawasaki City’s official page.
👉 Click here for Kawasaki City’s official page
National Subsidy “DR Home Storage Battery Project (Support Project for Introducing 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 individuals introducing registered storage systems that can be utilized for demand response (DR), and in the Reiwa 7 fiscal year supplementary project, the subsidy amount was determined based on a standard amount of 34,500 JPY per initial effective capacity of 1kWh, with a subsidy rate of up to 30% and a maximum of 600,000 JPY per application. There are also conditions such as projects contracted or ordered before the Grant Decision are not eligible.
However, the supplementary budget for Reiwa 7 reached the application amount on May 29, 2026, and the public recruitment has ended (the previous year’s Reiwa 6 supplementary budget also ended on July 2, 2025). Applications are currently not accepted, so please check the official website for future public recruitment.
Additionally, there are currently no subsidies confirmed from the national government specifically for the installation of solar panels on existing homes.
👉 Here is the official site for the DR Home Battery Project
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Installation Subsidy”
In Kanagawa Prefecture, subsidies are provided for those who install both “solar panels” and “storage batteries” 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 excluded, and the application must be made by the individual (applications by contractors on behalf are not allowed). It is also possible to combine this with subsidies from Kawasaki City.
For Reiwa 8, the first period (May 11 to June 30) and the second period (September 7 to September 30, first-come-first-served) have been accepted, and the second period has reached its application deadline. Please check the official page of Kanagawa Prefecture for future recruitment.
👉 Here is the official page of Kanagawa Prefecture
Kawasaki City “Eco Support Subsidy for Local Businesses” (for businesses)
Kawasaki City is implementing a subsidy for businesses aimed at small and medium-sized enterprises that have (or will establish) a business location in the city, supporting the introduction of renewable energy such as solar power generation equipment.
Eligible applicants include small and medium-sized enterprises, educational institutions (with fewer than 100 employees), medical corporations (with fewer than 300 employees), and social welfare corporations (with fewer than 100 employees), while individual residential installations are not eligible. Solar power generation must be less than 50kW, and for systems over 10kW, they must be for self-consumption. If storage batteries or V2H are also installed, they are eligible as well.
The subsidy amount is one-third of the eligible expenses (up to 2,000,000 yen), and if solar power generation is included, an additional 10,000 yen per kW (up to 200,000 yen) will be added.
The application period for Reiwa 8 is from April 1, 2026, to January 12, 2027, and applications will close once the budget limit is reached.
Businesses considering the installation of solar panels in stores, offices, or factories within Miyamae Ward should check the conditions for eligible businesses and equipment on the official page of Kawasaki City.
👉 Here is the official page of Kawasaki City
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Subsidy for Self-Consumption Type Renewable Energy Introduction” (for businesses)
In Kanagawa Prefecture, there are also subsidies for businesses introducing “self-consumption type” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners filing blue returns, and individual residential installations are not eligible.
Conditions include solar power generation with an output of 10 kW or more, supplying electricity to business facilities within the prefecture, and being equipment that is not 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).
The application for Reiwa 8 Year has closed on September 3, 2026, as the application amount reached the budget limit.
Businesses considering the installation of solar panels on commercial buildings in Miyamae Ward should check the official Kanagawa Prefecture page for the next recruitment.
👉 Click here for details
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | For Costs of Solar Panel Removal and Water Heater Dismantling, Click Here
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and storage batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs”.
Even for the same “Complete Solar Panel Installation,” the amount can vary significantly depending on the installation capacity, the grade of the equipment, and the condition of the roof.
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). Storage 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 shape, orientation, and size of the roof. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panels at an estimated cost of 800,000 JPY to 1,200,000 JPY for 3-5 kW, and 1,200,000 JPY to 1,900,000 JPY for 6-10 kW. (These are just estimates and can vary based on wiring length, scaffolding area, existing roofing materials, panel layout, etc.)
▶ Service Menu | For Costs of Solar Panel Installation and Storage Battery Installation, Click Here
Items to Confirm in the Estimate (Cost Verification)
When comparing estimates, it is common to compare different capacities and equipment by only looking at the amounts. Please check if the following items are clearly stated in the estimates from each company!
| 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 check if it is a type that controls the battery together. |
| 3. Storage Battery | Manufacturer, model number, capacity (kWh), range usable during a power outage (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 is a method that drills holes or a method that grips and secures). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, presence of a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed parts, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | Extent of support for applications to the power company, certification application for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roofing work and exterior painting are done simultaneously, check that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters and old panels, as well as disposal costs for waste materials, are included. |
| 10. Tax Classification and Warranty | Whether prices are tax-inclusive or tax-exclusive, conditions under which additional costs may arise, details and duration of manufacturer warranty and workmanship warranty. |
If the capacities differ, both the price and power generation will change. Kakeru Koumuten Co., Ltd. warmly welcomes competitive estimates, so if you bring estimates from other companies, we will explain the differences for each item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can obtain an estimated quote 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 obtain an estimated quote and profit simulation!
*The simulation results are estimates. Actual profits may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection and 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 |
| Base Mounting Hardware Used |
| Niigata Manufactured / Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed by catching the horizontal metal roof with catch type hardware (Catch Method) |
| Price Range |
| 2.2 million yen to 2.3 million yen *Due to the grant being provided, the actual burden amount is approximately 1 million yen Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The grant amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| Approximately 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that grants are available, and I would like to know how much will be provided. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels from the drawings!
The layout diagram shows the arrangement of solar panels when placed on the roof.
Since we can also determine the installation capacity, it allows for power generation simulations and financial simulations.
We have also understood the expected grant amount, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Miyamae Ward, Kawasaki City
There are many solar panel installation contractors that serve Miyamae Ward, Kawasaki City, and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and storage battery installation work, let’s check the following four points.
● Have extensive knowledge not only about solar panels but also about roofs
● Confirm the existence of warranties and aftercare maintenance
● Obtain estimates from multiple contractors (three companies is a guideline)
● Check if they provide support for subsidy applications
By confirming the above four points, you will be able to choose a reliable contractor.
Have knowledge not only about solar panels but also about roofs
Defective installation of solar panels can sometimes be caused by a lack of knowledge and confirmation 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 were installed on a severely deteriorated roof, leading to leaks
・Solar panels were installed on a roof with a short lifespan, necessitating renovations to detach and reattach the solar panels within a few years
・Misjudging the type of waterproofing led to incorrect treatment and subsequent leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows you to avoid unnecessary expenses and unforeseen troubles.
▶ Go to “Roof Check Before Installing Solar Panels” in this article
Confirm the existence of warranties and aftercare maintenance
When choosing a solar installation contractor, let’s confirm the existence of warranties. It is important to check not only the number of years but also the scope of coverage, disclaimers, and cost conditions.
While the solar panels and storage batteries come with a manufacturer’s warranty, it is also important to check the existence of a workmanship warranty in case leaks occur after installation!
For contractors that offer a workmanship warranty, if leaks occur after installation, they may be able to respond under the warranty if it falls within the warranty period and conditions.
Additionally, some contractors offer after-sales services separate from warranties, so make sure to check if the contractor you are considering has after-sales services.
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 during after-sales maintenance, we can easily prevent major repairs or failures by discovering issues early!
Kakeru Koumuten Co., Ltd. provides a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty without performing roof renovations.)
We also conduct after-sales maintenance and send out DM every year!
Please check the DM, and if you wish, we will come to perform after-sales maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting solar panel installation, be sure to obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs and warranties or after-sales services may vary.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request services from your preferred contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates, please check the following:
“Check the items in the estimate”
“Type of solar panel”
“Warranties and after-sales services”
Make sure to compare these details carefully! If the quality of the auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price!
▶ Go to “Breakdown of Installation Capacity and Equipment/Construction Costs” in this article
Check if they provide support for subsidy applications
Subsidies may be 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 Kanagawa Prefecture’s residential subsidies, where contractors cannot apply on behalf of the client, it is reassuring to have a contractor who can assist with the preparation of necessary documents and the flow of procedures.
Make sure to complete the procedures specified for each system (for the prefectural residential subsidy, this means obtaining a grant decision) before proceeding with the construction!
For the prefectural residential subsidy, after the construction is completed, a performance report must be submitted, and the subsidy will be granted after a review! (The flow of procedures varies by system)
▶ To “Subsidies and Grants That May Be Applicable in Miyamae Ward” in this Article
Benefits of Introducing Solar Power Equipment
The benefits of introducing solar panels are summarized in the following 5 points!
Benefit 1: Economic Advantage
The biggest advantage of introducing solar panels is the economic benefit!
While the selling price of electricity has decreased compared to 10 years ago, you can benefit by reducing the electricity you buy from the power company through self-consumption of the generated electricity!
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 tends to be more advantageous to use it at home (self-consumption), 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: Subsidies Can Be Utilized!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the conditions, you may be able to utilize subsidies!
Reducing the actual burden amount through subsidies is a significant advantage!
In the case of Miyamae Ward, there may be subsidies available for solar power installation costs from Kawasaki City and Kanagawa Prefecture.
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, equipment such as power conditioners may have operational noise.)
Benefit 4: Heat Insulation Effect Expected!!
By installing 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 shielding 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 capabilities, 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 can be incurred
A maintenance cost that is particularly easy to overlook is the roof where solar panels are installed.
If you perform roof renovations 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 renovate it with durable roofing materials before installing solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.
It 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 when using screws or other fasteners to secure the roofing material and substrate, waterproofing of the fixed parts becomes crucial.
If the method involves 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 securing the solar panels using the catch method is also an option. (The catch method has compatibility conditions between the roofing material and fasteners, and it cannot be used with all metal roofs.)
Foundation Brackets for Horizontal Metal Roofs
Note 3: The Roof Becomes Heavier
Installing solar panels will add weight to the roof. It is important to investigate the existing roof, substrate, and load-bearing capacity, and if necessary, consider replacing it with a lighter roof.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply a matter of “This manufacturer has the best solar panels”; it is important to choose solar panels that are suitable for your life plan and building!
Here are some points to consider when comparing solar panels!
Choosing Method 1: Compare Based on Total Roof Output
When installing solar panels on the roof, it is crucial to consider how much electricity can be generated in the limited area, and the more electricity generated, the better!
Solar panels come in various sizes and outputs 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 panels does not fit well on the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” resulting in different installation capacities on the same roof due to the size difference.
400W × 15 panels = 6kW (Total roof output)
350W × 20 panels = 7kW (Total roof output)
As shown above, even if the output of a single panel is lower, the total output of the roof may be higher!
It is important to consider the total output of the roof rather than the output of a single panel!
*The above calculations are for total output (kW). The actual electricity generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
Choosing Method 2: Compare Based on Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases over 10 or 20 years.
The degree of output reduction after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or electricity generation itself.
Choosing solar panels by considering the degradation rate as well as the initial output will help avoid regrets!
Choosing Method 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 provide a 10-year warranty, so it varies!
It’s always better to have a longer warranty, so let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Miyamae Ward
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Miyamae Ward. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Miyamae Ward, Kawasaki City?
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 available on our solar panel installation and storage battery installation pricing page. We will create a layout diagram from the drawings and site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Miyamae Ward?
As of October 6, 2026, Kawasaki City has the “Reiwa 8 Fiscal Year Solar Power Generation Equipment Installation Subsidy” (for individual residences; solar power is 70,000 yen/kW; maximum 280,000 yen per case, etc.), which is accepting applications until December 28, 2026 (there is a possibility of early termination depending on budget status). The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power and 150,000 yen per unit for storage batteries) is approaching the application deadline for the second term of Reiwa 8, and the national DR household storage battery program has ended its public recruitment.
Since the application status may change, please check the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies after the construction is completed?
For many programs, procedures are required before construction. Both Kawasaki City and Kanagawa Prefecture subsidies require “commencement of construction after the grant decision,” and if you start before receiving the grant decision notification, you will be ineligible.
The order of procedures varies by program, so please confirm before signing a contract or starting construction.
Can solar panels be installed on slate roofs? I’m worried about leaks.
It is possible to install on slate roofs, 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 is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation, and if deterioration is advanced, we can also propose methods such as roof overlay (cover method) or replacement before installation.
The roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. If a roof renovation is needed after 10 to 20 years, the cost for removing and reinstalling solar panels will be incurred separately. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
Is it better to install a storage battery together with solar panels?
For those who want to use 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 subsidies in Kanagawa Prefecture require the simultaneous introduction of solar panels and storage batteries, and there are subsidy options for storage batteries in Kawasaki City. You can compare “solar panels only” and “solar panels + storage batteries” through a financial simulation.
How many kW can be installed on my roof? Is it okay for north-facing roofs or roofs with shadows?
The capacity that can be installed varies depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create a layout diagram from the drawings and site survey, and provide you with the installation capacity and power generation simulation.
In Miyamae Ward, many residential areas are hilly, 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 is the construction period?
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 done simultaneously or depending on the roof shape and installation capacity.
Please note that there is a separate period required for applications for subsidies and power companies, so please consult us early.
What is the current selling price (FIT)?
For residential use (under 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 it 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 provides a financial simulation that takes into account loan interest rates and electricity costs.
Can you provide maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-service maintenance notices via DM and visits customers who request inspections. We can also clean solar panels using a specialized brush if the power generation decreases due to dirt.
Since the roof is a place that is difficult to check by yourself, please feel free to consult us if you have any concerns.
Can you also renovate roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten can remove and reinstall solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them, all in one process. The removed panels can be stored in our warehouse.
For information on costs, please see the solar panel removal and water heater removal pricing page.
If you are looking for a solar panel installation contractor in Miyamae Ward, consult Kakeru Koumuten
Our company handles a wide range of exterior renovations, including solar panel installations, roof work, and exterior wall work in Kawasaki City, Miyamae Ward.
We receive requests from many customers, including renovation companies and real estate agencies, who have contacted us!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received positive feedback from many customers.
We continue to update our number of completed projects each 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 complete roof replacements but also partial roof repairs, exterior painting, and exterior cover methods.
We are also happy to assist with small jobs like partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide temporary fixes 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 the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always take the customer’s perspective and propose the best construction plans!
We are confident that we will not be outdone by other companies in terms of cost, quality, and organization for exterior work!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if you find that our company is inferior to others, feel free to decline!
Characteristics of Miyamae Ward, Kawasaki City, and Points for Solar Work
Miyamae Ward is located in the northwest part of Kawasaki City. It has developed as a suburban residential area centered along the Den-en-toshi Line, with residential areas spread across hilly terrain.
We have summarized the terrain and housing conditions in Miyamae Ward and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Miyamae Ward, Kawasaki City, and points for solar work
■ In hilly residential areas, checking the roof orientation and shadows is important
Current Situation and Main Issues in Miyamae Ward, Kawasaki City states that many areas in Miyamae Ward are hilly, characterized by a terrain with many slopes (data published in October 2008).
In residential areas on hilly terrain, even within the same block, the orientation and height of roofs, as well as the shadows cast by neighboring houses, trees, and retaining walls, vary from house to house. Since solar panels generate less electricity when shaded, Kakeru Koumuten creates layout diagrams based on blueprints and the actual site conditions, allowing you to confirm through power generation simulations.
■ Responding to Sloped and Uneven Sites with Our Own Scaffolding
For sites facing slopes or residential areas with narrow front roads, careful planning for scaffolding and equipment delivery is necessary. Kakeru Koumuten will respond according to the site using our own scaffolding team and scaffolding materials.
■ Check Roof Conditions According to the Age of Suburban Homes
The same data indicates that Miyamae Ward has developed as a suburban residential area centered around the Den-en-toshi Line and various stations. For homes that have aged since construction, it is important to check the condition of roofing materials and substrates before installing solar panels. Depending on the roof’s condition, installing them simultaneously with roof renovations can help reduce future costs for removing and reinstalling solar panels.
■ Homes Near Parks and Green Spaces Should Be Cautious of Leaves and Dirt
The same data mentions that Miyamae Ward has environmental resources such as the Hirase River, Yagami River, and Arima River, as well as Ikuta Green Space, Suga Green Space, and Higashi Takane Forest Park. While areas close to greenery are attractive, roofs near trees are prone to accumulating leaves and dirt on the panels, which can lead to decreased power generation. Kakeru Koumuten can also provide solar panel cleaning with specialized brushes and rain gutter cleaning.
■ Yokohama’s Annual Sunshine Duration is About 2,018 Hours
According to the Japan Meteorological Agency’s average values (1991-2020), Yokohama’s annual sunshine duration is about 2,018 hours (this value is not for Miyamae Ward, but for an observation point in eastern Kanagawa Prefecture). August has the most sunshine, while June during the rainy season has the least.
Power generation varies by season, so conducting annual power generation simulations and selecting battery capacity to match peak electricity usage times are key points.
■ Separate Subsidy Programs for Commercial Buildings Such as Stores and Offices
When installing solar panels on commercial buildings such as stores, offices, or factories, there are separate subsidy programs from those for households. The Kawasaki City Eco Support Subsidy for local businesses is accepting applications until January 12, 2027, and will end once the budget cap is reached, with specific conditions for eligible businesses and equipment.
Our company is based in Kanagawa Prefecture and has undertaken many exterior construction and solar projects in Miyamae Ward, Kawasaki 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 Miyamae Ward, Kawasaki City
Kakeru Koumuten accepts requests across all of Kanagawa Prefecture and Tokyo.
List of Areas in Miyamae Ward, Kawasaki City
Arima, Miyamae Ward / Inuzuka, Miyamae Ward / Kajigaya, Miyamae Ward / Keyaki-daira, Miyamae Ward / Odai, Miyamae Ward / Goshoduka, Miyamae Ward / Saginuma, Miyamae Ward / Shio Midai, Miyamae Ward / Kamikihoncho, Miyamae Ward / Kamiki, Miyamae Ward / Shirahata-dai, Miyamae Ward / Sugaoka, Miyamae Ward / Suga, Miyamae Ward / Hira, Miyamae Ward / Dobashi, Miyamae Ward / Minami-no-dai, Miyamae Ward / Nishinogawa, Miyamae Ward / Nogawadai, Miyamae Ward / Nogawa Honcho, Miyamae Ward / Hatsuyama, Miyamae Ward / Higashi Arima, Miyamae Ward / Masugane, Miyamae Ward / Mizusawa, Miyamae Ward / Minami Nogawa, Miyamae Ward / Miyazaki, Miyamae Ward / Miyamae-daira, Miyamae Ward
・Trust Kakeru Koumuten for exterior wall painting in Miyamae Ward, Kawasaki!
・Trust Kakeru Koumuten for roof renovations in Miyamae Ward, Kawasaki!
・Trust Kakeru Koumuten for exterior renovations in Miyamae Ward, Kawasaki!
・Trust Kakeru Koumuten for leak repairs in Miyamae Ward, Kawasaki!
・Trust Kakeru Koumuten for waterproofing work in Miyamae Ward, Kawasaki!
・Kakeru Koumuten Co., Ltd. construction achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. construction menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・Top 12 solar power generation manufacturers! Features and selection tips included!
・What are the installation costs for solar power generation? Comprehensive tips to reduce costs!
・What are the best locations for solar power generation installation? Key points for site selection included!
・Here is the introduction for 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!
