Leave the installation of solar panels in Zushi City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
For Solar Panel and Battery Installation in
Zushi City,
Kakeru Koumuten is at your service!
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
As a company strong in roofing work, we are entrusted with solar panel and battery installation considering roofs and waterproofing!
“How to Choose a Solar Panel Contractor in Zushi City”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Zushi City”
We will also explain the above three points!
Installing solar panels carries risks such as “the occurrence of leaks” and other troubles.
To ensure a satisfactory solar panel installation, we recommend obtaining estimates from about three companies!
Table of Contents (Tap to Open/Close)
- Reasons Kakeru Koumuten is Chosen for Solar Panel Installation in Zushi City
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Zushi 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 Contractor in Zushi City
- Benefits of Introducing Solar Equipment
- Points to Note When Introducing Solar Power Generation
- How to Choose Solar Panels
- Frequently Asked Questions About Solar and Storage Battery Installation in Zushi City
- If You’re Looking for a Solar Panel Installation Contractor in Zushi City, Contact Kakeru Koumuten
- Characteristics of Zushi City and Points for Solar Installation
- Service Area in Zushi City
Reasons Kakeru Koumuten is Chosen for Solar Panel Installation in Zushi City
Regarding why we are entrusted with solar panel installation by customers in Zushi City,
“Our strengths in solar panel installation that cannot be imitated by other companies”
have received high praise from many customers.
so we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome inquiries for estimates from any number of companies!
1. We Also Handle Exterior Renovations Beyond Solar Panel Installation!
Problems such as leaks that occur with solar panel installations may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if one is knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside their expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance issues and troubles after installation!
Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent troubles after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has 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 Ownership of Scaffolding Materials
To ensure safety during work on the roof, we own the scaffolding materials necessary for temporary scaffolding based on construction conditions and can assemble scaffolding in-house.
By not outsourcing scaffolding work and using our own scaffolding team, we can also cut costs related to scaffolding construction.
We own scaffolding materials for approximately 50 houses!
Even in cases where there are height differences on the site, our in-house scaffolding team will plan the scaffolding according to the local conditions.
Storage of Materials in Our Large Warehouse
We store roofing materials and paints, and we can also store removed solar panels.
By ordering a large quantity of materials at once, we canpurchase materials at a lower cost!
Additionally, we always have a stock of roofing materials, allowing us torespond quickly in emergencies!
Sorting and Transporting Waste Materials In-House
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut waste disposal costs.
Exterior Renovation Dedicated Showroom
In the showroom, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and see how they are installed on roofing materials!
Simulations for potential earnings and installation costs when introducing solar panels are also available!
Since roofing and exterior wall work often accompany renovations, we also provide 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 a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof renovations at a reduced cost.
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 possible.
We can provide consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry licenses and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal workers and painting specialists, giving us confidence in our construction techniques.
We are capable of handling large-scale roof projects such as those for factories!
5. Warranty and Aftercare Maintenance
In addition to the manufacturer’s warranty for solar panel installation, 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, a roof renovation may be required to provide the warranty. The construction warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare maintenance 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.
If you cannot access the roof at high altitudes, we can utilize a drone to assist!
During leak investigations, we can also conduct inspections using a thermal imaging camera.
If the power generation of the solar panels decreases due to dirt, we can provide cleaning services using specialized brushes.
We will respond according to the customer’s wishes.
7. Human Resource Development
To improve skills, we create various roof models and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training so that each staff member can handle various cases.
8. Creation of Easy-to-Understand Materials and Simulations
Kakeru Koumuten provides “estimates,” “layout diagrams,” and “power generation simulations”, as well as “solar installation guidebooks” and “profit and loss simulations” that take into account loan interest rates and electricity costs.
Profit and loss simulations can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar installations will receive easy-to-understand materials that include points to consider and disadvantages!
We encourage you to obtain comparative estimates and compare them with other companies’ plans!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 or 30 years.
Confirming “Is it okay to install directly on the current roof?” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | The fixing method varies depending on the roofing materials such as slate, tiles, metal roofs, and flat roofs (rooftop waterproofing). If the remaining lifespan of the roofing material is short, we may suggest a roof renovation first. |
| 2. Condition of Substrate and Waterproof Sheet | If the sheathing or roofing (waterproof sheet) under the roofing material is damaged, it 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 check it with a power generation simulation. |
| 4. Shape of the Roof and Usable Area | The number of panels that can be installed (installation capacity) is determined by the shape and size of the roof. Since the number of panels that can be installed varies depending on the panel size, 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 fixing or using brackets to secure the roofing material. The fixing method varies by technique, so please confirm the waterproofing treatment method for the fixed parts during the estimate. |
| 6. Weight of the Roof | The roof will become heavier due to the panels being installed. After investigating the existing roof, substrate, and load-bearing capacity, switching to lighter roofing materials may also be an option if necessary. |
| 7. 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. |
| 8. Ease of Scaffolding Setup and Delivery Routes | If there is a height difference on the site, careful planning for scaffolding and delivery routes for equipment and materials may be necessary. The width of the front road and any steps on the site will also be checked during the site survey. |
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) | Waterproof treatment of fixing parts, cracks or deterioration of slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suited to the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be methods to replace with lighter roofing materials before installation. |
| Metal Roof (Horizontal and Vertical) | Fixed with catch-type brackets that grip the roof material (depends on the combination of roof material and brackets) | Whether the roof material and brackets are compatible, installation conditions from the roof material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a framework | Type and deterioration status of the waterproof layer, waterproofing around the framework. Consider in conjunction with the timing of waterproofing work. |
If you perform roof renovations 10 to 20 years after installation, there will be additional costs for removing and reinstalling solar panels. If the roof is deteriorating, it may be more cost-effective in the long run to renovate to a highly durable roofing material before installation.
Kakeru Koumuten is strong in roofing work and can also handle the removal and reinstallation of solar panels in-house, so please consult us according to the condition of your roof!
▶ Click here for roof renovations in Zushi City
PotentialSubsidies and Grants in Zushi City, Kanagawa Prefecture
If you are introducing solar panels or storage batteries in Zushi City, there is a possibility that you may be eligible for programs from the “National Government,” “Kanagawa Prefecture,” and “Zushi 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 |
|---|---|---|---|
| Zushi City “Key Measures Acceleration Project Subsidy (Home Self-Consumption Solar Power Generation Equipment & Combined Storage Battery (Self-Owned))” | Equipment owned by the applicant installed in residential properties within Zushi City. Must consume 30% or more of generated power for self-consumption and not obtain FIT/FIP certification. Storage batteries must be installed simultaneously with solar power (storage batteries alone are not eligible). No delinquency in municipal taxes. In principle, work cannot commence before grant approval. Performance reports due by February 15, 2027 | Solar Power: 70,000 JPY per kW (rounded down for less than 1 kW) Storage Battery: One-third of the total cost of the storage system and construction (storage system capped at 141,000 JPY/kWh) |
May 1, 2026 – January 15, 2027 (first-come, first-served) Application temporarily suspended after reaching budget limit on July 31, 2026, and reopened on October 5 at 9 AM. As of 9 AM on October 5, applications amount to 70.0% of the budget of 24,562,000 JPY May be combined with Kanagawa Prefecture subsidies. Cannot be combined with the city’s carbon-neutral promotion subsidy |
| Zushi City “Reiwa 8 Fiscal Year Renewable Energy, Energy Conservation, and Energy Storage Equipment Installation Subsidy” (Carbon Neutral Promotion Subsidy) | Individuals installing renewable energy, energy conservation, or energy storage equipment in residential properties within the city. Applications for solar power generation equipment, stationary storage batteries, and home fuel cells have ended due to reaching the budget limit | (Applications for solar power and storage batteries are currently unavailable due to closed applications) | As of the September 9, 2026 update on the city’s official page, applications amount to 99.8% of the budget of 7,000,000 JPY, and solar power and storage batteries are no longer accepting applications |
| Kanagawa Prefecture “Reiwa 8 Fiscal Year Kanagawa Prefecture Residential Solar Power Generation & Storage Battery Installation Subsidy” | Must install both solar power generation and storage systems in residential properties (with earthquake resistance). Applications must be submitted by the individual, and work can only commence after grant approval | Solar Power: 70,000 JPY/kW Storage Battery: 150,000 JPY per unit |
Phase 1: May 11, 2026 – June 30, 2026 Phase 2: Starts September 7, 2026 (first-come, first-served) Applications reached the budget limit on September 7, 2026, and acceptance has been closed. Future applications will be announced on the prefecture’s official page |
| National “DR Home Storage Battery Project” (Reiwa 7 Fiscal Year Supplement) | Newly install 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% & maximum 600,000 JPY per application) | As of May 29, 2026, the budget has been reached, and public recruitment has ended (the official site states there are no plans to reopen applications, and currently, applications cannot be submitted) |
| National “Mirai Eco Housing 2026 Project” (Renovation) | Storage batteries are one of the eligible facilities, but 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/unit | Ends as soon as the budget limit is reached. As of October 5, 2026, the application amount for renovations is displayed as 8% of the budget on the official website. Please check the application status on the official website. |
| 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 must have a generation capacity of 10kW or more, for business facilities, and equipment not certified under FIT/FIP, etc. | Solar Power: 80,000 JPY/kW, etc. Storage System: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Application period ends on September 3, 2026 (when the application amount reaches the budget amount) |
The Zushi City Key Measures Acceleration Project Subsidy is on a first-come, first-served basis, and applications will be suspended once the budget limit is reached (suspended once on July 31, 2026, and resumed on October 5). Additionally, in principle, work cannot begin before the grant decision. The housing subsidies from Kanagawa Prefecture also require that construction begins after receiving the “grant decision,” and starting work beforehand will make you ineligible. The city’s carbon neutrality promotion subsidy cannot be combined, and the eligibility for combination varies by program. It is not guaranteed that you will receive the subsidy just by applying, so please confirm before contracting or starting work.
Kakeru Koumuten will guide you on eligibility conditions and application periods for each program after confirming them.
National Subsidy “DR Home Storage Battery Project (Support Project for Home Storage System Introduction for DR Resource Implementation)”
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 registered storage systems that can be utilized for demand response (DR), and in the fiscal year 2025 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 conditions such as being ineligible for items contracted or ordered before the grant decision.
However, the fiscal year 2025 supplementary application amount reached the budget on May 29, 2026, and the public recruitment has ended. The official website also states that there are no plans to reopen the public recruitment, and applications cannot be made at this time. Please check the official website for future public recruitment.
Furthermore, there are currently no subsidies available from the national government specifically for the installation of solar panels on existing homes.
👉 Here is the official website for the DR Home Storage Battery Project
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation & Storage Battery Introduction Subsidy”
Kanagawa Prefecture provides subsidies for those who introduce both “solar panels” and “storage batteries” to their residences.
The details of the subsidy are as follows: 70,000 yen per 1 kW of solar power generation output, and 150,000 yen per storage system.
For example, if you introduce a 4 kW solar panel and one storage battery, the calculation for the subsidy amount would be 4 kW × 70,000 yen + 150,000 yen = 430,000 yen.
The eligibility is for houses that ensure seismic performance, and the storage system must be a registered product. Additionally, if construction begins before the grant decision, it will not be eligible, and the application must be made by the individual (applications by the construction contractor on behalf of the individual are not allowed). It is noted on the official page of Zushi City that the Zushi City Priority Measures Acceleration Project Subsidy can be combined with Kanagawa Prefecture’s subsidies, so please check the conditions for combination before signing the contract.
In the 2026 fiscal year, the first phase (May 11 – June 30) and the second phase (starting September 7, first-come-first-served) were accepted. The second phase has closed on September 7, 2026, as the application amount reached the budget amount. For future recruitment, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Kanagawa Prefecture “2026 Fiscal Year Kanagawa Prefecture Subsidy for Introduction of Self-Consumption Type Renewable Energy” (for businesses)
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated from solar panels.
Eligible applicants are corporations or individual business owners who file blue returns, and individual residential installations are not eligible.
Solar power generation must have an output of 10 kW or more, supply electricity to business facilities within the prefecture, and not be a facility certified under FIT or FIP.
The subsidy amount is 80,000 yen per 1 kW of solar power generation, and 50,000 yen per 1 kWh for the accompanying storage system (with a maximum of 5 million yen).
In the 2026 fiscal year, the application amount reached the budget amount, so the recruitment was closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings in Zushi City should check the official page of Kanagawa Prefecture for the next recruitment.
👉 Click here for details
Zushi City “Priority Measures Acceleration Project Subsidy (Residential Self-Consumption Type Solar Power Generation Equipment and Accompanying Storage Battery (Self-Owned))”
Zushi City is implementing the “Priority Measures Acceleration Project Subsidy” for those who introduce self-owned solar power generation equipment and storage batteries in residential homes within the city.
◎Subsidy Amount◎
● Solar power generation equipment: 70,000 yen per 1 kW (amounts less than 1 kW are rounded down)
●Storage Battery: One-third of the total cost of the storage system and installation (the maximum for the storage system is 141,000 JPY/kWh)
The storage battery is eligible only when installed simultaneously with solar power generation equipment; installation of the battery alone is not eligible.
Eligibility is limited to self-owned equipment installed in residential properties within Zushi City, with conditions including consuming more than 30% of the generated electricity for personal use, not obtaining FIT/FIP certification, having no outstanding municipal taxes, and not being a member of organized crime groups. In principle, starting work before the grant decision is prohibited, but if there are unavoidable reasons, it may be eligible if reported in the application. Performance reports must be submitted by February 15, 2027.
The application period is from May 1, 2026, to January 15, 2027, and it is on a first-come, first-served basis. Applications were temporarily suspended after reaching the budget limit on July 31, 2026, and reopened at 9 AM on October 5. As of 9 AM on October 5, the application amount was 17,203,000 JPY (70.0%) against the budget of 24,562,000 JPY, as published on the city’s official page. This cannot be combined with the city’s carbon neutrality promotion subsidy, but it may be combined with Kanagawa Prefecture’s subsidies.
For detailed requirements and application methods, please check the official page of Zushi City.
👉 Click here for Zushi City’s official page
Zushi City “Reiwa 8 Year Renewable Energy, Energy Saving, and Energy Storage Equipment Installation Subsidy” (Carbon Neutrality Promotion Subsidy)
Zushi City also offers subsidies for those installing renewable energy, energy-saving, and energy storage equipment in residential properties within the city, but solar power generation equipment, stationary storage batteries, and home fuel cells have reached the budget limit and are no longer accepting applications. As of the update on September 9, 2026, the city’s official page states that the application amount is 99.8% against the budget of 7,000,000 JPY. Please check the city’s official page for future application status.
👉 Click here for Zushi City’s official page
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | Click here for costs related to Solar Panel Removal and Hot Water Heater Dismantling
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and storage batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs.”
Even for the same “Complete Solar Panel Installation,” the amount can vary greatly depending on the installation capacity, equipment grade, and roof condition.
Understanding Installation Capacity (kW) and Storage Battery Capacity (kWh)
The installation capacity of solar panels is determined by “Output of One Panel (W) × Number of Panels”, with the unit being kW (kilowatts). Storage batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hours).
The amount of kW that can be installed on a roof varies for each house depending 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 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 range, existing roofing materials, panel layout, etc.)
▶ Service Menu | Click here for costs related to Solar Panel Installation and Storage Battery Installation
Items to Check in the Estimate (Cost Confirmation)
When comparing estimates, it is common to compare different capacities and equipment by only looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW) should be specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also check if it is a type that controls the battery together. |
| 3. Battery | Manufacturer, model number, capacity (kWh), range of use during power outages (entire house or specific circuits), installation location. |
| 4. Mounting Frame and Hardware | Name of hardware suitable for roofing material and method of securing (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 fixed points, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | Extent of support for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roof work and exterior painting are done simultaneously, check that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters or old panels and disposal costs for waste materials are included. |
| 10. Tax Classification and Warranty | Whether it is tax-inclusive or tax-exclusive, conditions under which additional costs may arise, details and duration of manufacturer warranty and workmanship warranty. |
If the capacity differs, both the amount 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 get 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 battery, you can get an approximate estimate and profit simulation!
*The simulation results are approximate. Actual profits will vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Voices
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Case Studies of Solar Panel Installation
| 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 Manufacturing/Aluminum Catch-Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed using catch-type hardware to grip the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY ※Due to the grant, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) ※The grant amount and recovery estimate are based on the system and calculations at the time of construction and may differ under the current system. |
| Construction Period |
| About 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that grants are available, and I would like to know how much 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 Zushi City
There are many solar panel installation contractors available in Zushi City, and you may be unsure which one to choose.
For this reason, when requesting solar panel installation and battery installation work, let’s confirm the following 4 points.
● Not only knowledge of solar power but also extensive knowledge about roofs
● Confirm the existence of warranties and aftercare services
● Obtain estimates from multiple contractors (3 companies is a guideline)
● Check if they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable contractor.
Knowledge of roofs as well as solar panels
Defective 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 verification of roofs and waterproofing
・Solar panels were installed on a deteriorated roof, leading to leaks
・Solar panels were installed on a roof with a short lifespan, requiring remodeling and removal of the solar panels within a few years
・Misjudgment of 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 Verification Before Installing Solar Panels” in this article
Confirm the existence of warranties and aftercare services
When choosing a solar installation contractor, let’s confirm the existence of warranties. It is important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
Solar panels and batteries come with manufacturer warranties, but also check for the existence of installation warranties in case leaks occur after installation!
For contractors that offer installation warranties, 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 aftercare services separate from warranties, so be sure to check if the contractor you are considering has aftercare services.
Since abnormalities or damages on the roof can be in hidden areas, you may not notice them yourself.
By conducting inspections of hidden areas during aftercare maintenance, you can more easily detect abnormalities early and prevent major repairs or failures!
At Kakeru Koumuten Co., Ltd., the installation of solar panels comes with a leak warranty as part of the workmanship warranty. (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 without performing a roof renovation.)
We also conduct aftercare maintenance and send out annual DM!
After checking the DM, if you wish, we will visit for aftercare maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting the installation of solar panels, let’s obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs may vary, and warranties and after-services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the estimate items”
“Type of solar panel”
“Warranties and after-services”
let’s compare them in detail and make a judgment! If the rank of auxiliary materials is low or if processes are skipped, costs can be reduced, so avoid judging solely based on price!
▶ Go to “Breakdown of installation capacity, equipment, and construction costs” in this article
Check if they provide support for subsidy applications
There may be subsidies available for the installation of solar panels and storage batteries, but if the order of procedures is incorrect or if there are deficiencies in the documents, there is a possibility that the grant will not be awarded.
For systems like Kanagawa Prefecture’s housing subsidies, where contractors cannot apply on behalf of the client and personal application is required, it is reassuring to have a contractor that supports the preparation of necessary documents and the flow of procedures.
Let’s 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 completion of construction, a performance report must be submitted, and the grant will be awarded after review! (The flow of procedures varies by system)
▶ Go to “Subsidies and grants that may be applicable in Zushi City” in this article
Benefits of Introducing Solar Equipment
The benefits of introducing solar panels are the following 5 points!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
The selling price of electricity has decreased compared to 10 years ago, but by consuming the electricity generated, 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!
Furthermore, the selling price (FIT) for residential use (under 10kW) will be set at “24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year” for certifications after October 2025, and the same price will apply for the 2026 fiscal year. After the 5th year, it is likely to be 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 and Energy | For purchase prices and periods, click here
Advantage 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 through subsidies is a significant advantage!
In the case of Zushi City, there is a possibility of being eligible for subsidies from the city and Kanagawa Prefecture.
Advantage 3 Environmentally friendly!
Solar power generation has low carbon dioxide emissions and can reduce dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (However, devices like power conditioners may produce operational noise.)
Advantage 4 Heat insulation effects are 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 of the roof, providing expected heat insulation effects!
（This does not improve the insulation performance of the building itself）
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it is possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation capabilities, you may be able to use electricity from a dedicated outlet during daytime generation.
（The devices, output, and duration that can be used during a power outage vary depending on the model and wiring method）
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1 Maintenance costs can be incurred
A particularly overlooked maintenance cost is for the roof where solar panels are installed.
If you perform roof renovations 10 to 20 years later, there will be costs for removing and 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, regular inspections of the equipment, repairs or replacements of the power conditioner, and costs for updating due to the deterioration of the storage battery will also be incurred.
It would be reassuring to request a simulation considering maintenance costs before introducing solar panels!
Point 2 The risk of leaks increases depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix brackets to the roofing material or substrate with screws, waterproofing of the fixed parts is crucial.
In methods that involve making holes in the roof, the risk of leaks inevitably arises.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, one option is to replace the roofing material with a metal roof and fix the solar panels using the catch method. (The catch method has compatibility conditions between the roofing material and brackets, and it cannot be used with all metal roofs)
Catch-type base hardware for horizontal metal roofs
Note 3: The roof will become heavier
Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load capacity, replacing it with a lighter roof may also be an option if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply a matter of “This manufacturer has the best solar panels”; it is important to choose solar panels that are suitable for your life plan and building!
Here are some points to consider when comparing solar panels!
How to Choose 1: Compare by Total Output of the Roof
When installing solar panels on the roof, it is important to know how much electricity can be generated in a limited area, and generating more electricity is always better!
Solar panels vary in size and output depending on the manufacturer.
A panel with an output of 350W and a panel with an output of 400W may seem 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 numbers of panels that can be installed on the same roof due to size differences.
400W×15 panels = 6kW (total output of the roof)
350W×20 panels = 7kW (total output of the roof)
As shown above, even if the output of a single panel is lower, the total output of the roof may be higher!
It is important to consider the total output of the roof rather than the output of a single panel!
*The above is a calculation of total output (kW). The actual power generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
How to Choose 2: Compare by Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases over 10 or 20 years.
The degree of output reduction after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or power generation itself.
Choosing solar panels without considering only the initial output but also the degradation rate will lead to a more satisfactory choice!
How to Choose 3: Compare by Warranty Period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
Regarding the output warranty, 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 Zushi City
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Zushi City. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Zushi 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.
For cost estimates by capacity, please refer to our solar panel and storage battery installation pricing page. We will create a layout diagram from the drawings and site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Zushi City?
As of October 6, 2026, the Zushi City Priority Measures Acceleration Project Subsidy (70,000 yen per kW for solar power, one-third of the total for storage battery systems and installation costs) has reached its budget limit and was temporarily suspended, but applications reopened on October 5, 2026. However, it is on a first-come, first-served basis, and as of 9 AM on October 5, the application amount was 70.0% of the budget amount. The city’s carbon neutrality promotion subsidy for solar power and storage batteries has ended. The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power and 150,000 yen/unit for storage batteries) reached its budget limit on September 7 for the second phase of fiscal year 2026, and the national DR household storage battery project 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?
Both the Zushi City subsidy and the Kanagawa Prefecture subsidy require procedures to be completed before construction. The Zushi City Priority Measures Acceleration Project Subsidy generally does not allow work to begin before the grant decision, and the prefectural subsidy also requires “work to begin after the grant decision,” so starting work beforehand will make you ineligible.
The order of procedures varies by program, so please confirm before signing a contract or starting work.
Can solar panels be installed on a slate roof? I’m worried about leaks.
It is possible to install on a slate roof, but it is necessary to check the condition of the roofing material and substrate. The method of securing the panels varies by construction method, and if the method involves securing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a company specializing in exterior renovations with strong expertise 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.
My roof is old. Should I do a roof renovation first?
The condition of the roof will determine this. If a roof renovation is needed after 10 to 20 years, the cost of removing and reinstalling solar panels will be incurred separately. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
Is it better to install a storage battery together with solar panels?
For those who want to use generated electricity at night or prepare for power outages, simultaneous installation is recommended. The selling price of electricity will be 8.3 yen/kWh after the fifth year, making it more advantageous to use it in your home rather than selling it.
Additionally, the subsidy from Kanagawa Prefecture requires the simultaneous introduction of solar panels and storage batteries, and the subsidy for the Zushi City priority measures acceleration project also applies when the storage battery is installed at the same time as the solar power generation equipment; installation of the storage battery alone is not eligible. You can compare “solar only” and “solar + storage battery” in 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 will vary 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 Zushi City, there are areas close to hilly mountains and forests, as well as near the sea and rivers, so the shading from surrounding buildings and trees and the installable capacity will differ for each 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 panel 4.3 kW + storage battery), it took about 3 days. The duration may vary depending on whether roof work is performed simultaneously and the shape and installation capacity of the roof.
Please note that there will be an additional period for applications for subsidies and power companies, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (under 10 kW), from the certification after October 2025, the first four years will be 24 yen/kWh, and from the fifth to the tenth year it will be 8.3 yen/kWh, and the same price will apply for the 2026 fiscal year.
The idea is to recover initial costs more quickly in the first four years and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that takes into account loan interest rates and electricity prices.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-maintenance notices via DM and visits for inspections upon request from customers. We can also clean solar panels with a special brush if the power generation has decreased 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 ourselves, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them in a consistent manner. The removed panels can be stored in our own warehouse.
For information on costs, please see the solar panel removal and hot water heater removal pricing page.
If you are looking for a solar panel installation contractor in Zushi City, please consult Kakeru Koumuten
Our company handles many exterior renovations, including solar panels, roofing work, and exterior wall work in Zushi City.
We have received requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low cost”, and we have received positive feedback from numerous customers.
We continue to update our construction performance records 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 re-roofing but also partial roof repairs, exterior painting, and exterior cover methods.
We are also happy to handle small jobs like partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide emergency measures without setting up scaffolding, as long as safety can be ensured, so please consult 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 by other companies in terms of cost, quality, and organization for exterior work!
We welcome competitive quotes because we are confident!
Estimates are completely free, and if our company is found to be inferior to others, you are free to decline!
Features of Zushi City and Points for Solar Work
Zushi City is located at the base of the Miura Peninsula in Kanagawa Prefecture, adjacent to Yokohama City, Kamakura City, Hayama Town, and Yokosuka City, with a compact area of approximately 17.28 square kilometers where hilly mountains and the sea are in close proximity. We have summarized the characteristics of Zushi City’s terrain and points to be careful of when installing solar panels and storage batteries below. (Tap to open)
View the features of Zushi City and points for solar work
■ The terrain surrounded by hills on three sides requires attention to tree shadows, fallen leaves, scaffolding, and delivery routes
Zushi City is surrounded on three sides by hilly mountains, with Jimbuji Mountain as the main peak, and it is reported that the proportion of greenery in the city area is about 60%, with forests spreading right next to residential areas. In sites close to forests and trees, care must be taken regarding the shadow cast and the decrease in power generation due to fallen leaves and dirt. Additionally, if the site is near hills and has slopes or elevation differences, careful planning for scaffolding and the transportation routes for equipment and materials may be necessary. Kakeru Koumuten Co., Ltd. responds on-site with its own scaffolding team and owned scaffolding materials, and can also handle solar panel cleaning with specialized brushes and rain gutter cleaning.
■ For coastal areas facing Zushi Bay, confirm installation locations and equipment specifications in advance
Zushi City faces Zushi Bay, which has a coastline of 4.16 kilometers. When installing in locations close to the sea, it is important to confirm in advance whether the panels, power conditioners, batteries, etc., meet the manufacturer’s installation conditions (such as whether they are in areas subject to salt damage specifications). If you want to use electricity during a power outage, please consider installing a battery.
■ For sites near rivers or low-lying areas, also check the placement of batteries and equipment
The main river system in the city is the Tanegashima River, which merges with Ikego River and Kuki River to flow into Sagami Bay. For sites close to rivers, it is important to plan by checking the surrounding environment of the installation locations for batteries, distribution boards, power conditioners, etc. (such as whether it is a place where water tends to accumulate). Please check the information about your area using hazard maps and consult us about the installation location.
■ Because the city is close to both mountains and the sea, we check the roof and site individually through on-site surveys
In Zushi City, where the conditions around sites vary, such as those near mountains, the sea, or rivers, the types of roofs, years of construction, and sunlight exposure differ from house to house. At Kakeru Koumuten Co., Ltd., we will confirm the type and condition of the roof and the situation of the site before installation, and propose methods for fixing, waterproofing arrangements, and scaffolding plans.
■ The annual sunshine hours in neighboring Yokohama is about 2,018 hours
According to the Japan Meteorological Agency’s average values (1991-2020), the annual sunshine hours in Yokohama City, adjacent to Zushi City, is about 2,018 hours. Monthly, August (about 206 hours) has the most, while June during the rainy season (about 136 hours) has the least.
Power generation varies by season, so conducting an annual power generation simulation and selecting battery capacity to match the times of high electricity usage is key.
Our company is based in Kanagawa Prefecture and handles many exterior construction and solar projects in Zushi City.
We are happy to respond to partial roof repairs such as roof overlay work, roof replacement, and leak repairs, as well as other repairs! Please feel free to consult us about any sudden troubles!
Service Area in Zushi City
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo Metropolis.
List of Areas in Zushi City
Zushi City Ikeko / Zushi City Kotsubo / Zushi City Sakurayama / Zushi City Shinjuku / Zushi City Zushi / Zushi City Numama / Zushi City Hisaki / Zushi City Yamanone
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・Kakeru Koumuten’s construction achievements
・Kakeru Koumuten’s aftercare services
・Kakeru Koumuten’s construction menu and price list
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・Explaining the importance of comparative estimates and key points!
・Top 12 solar power manufacturers! Features and selection tips included!
・What are the installation costs for solar power? Comprehensive tips to reduce costs!
・What are the best locations for solar power installation? Key points for site selection included!
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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!
