Leave the installation of solar panels in Chuo Ward, Sagamihara City to Kakeru Koumuten Co., Ltd.!
For
Solar Panel and Storage Battery Installation in
Chuo Ward, Sagamihara 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 with solar panel and storage battery installations considering roofs and waterproofing!
“How to Choose a Solar Panel Contractor in Chuo Ward”
“Costs for Solar Panel and Storage Battery Installation”
“Subsidies Available for Solar System Installation in Chuo 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 a satisfactory solar panel installation, we recommend obtaining three or so estimates!
Table of Contents (Tap to Open/Close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Chuo Ward, Sagamihara City
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Chuo 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 Installer in Chuo Ward, Sagamihara 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 Chuo Ward
- If You’re Looking for a Solar Panel Installer in Chuo Ward, Contact Kakeru Koumuten
- Characteristics of Chuo Ward, Sagamihara City and Key Points for Solar Installation
- Service Area in Chuo Ward, Sagamihara City
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Chuo Ward, Sagamihara City
Here are the reasons why our company is entrusted with solar panel installation by customers in Chuo Ward, Sagamihara City:
One reason is that Kakeru Koumuten has a base in Kanagawa Prefecture,
and we have unique strengths in solar panel installation that cannot be replicated by other companies. We have received high praise from many customers.
We would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome multiple estimates!
1. We Also Handle Exterior Renovations Beyond Solar Panel Installation!
Troubles such as leaks that occur during solar panel installation may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if you are knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have knowledge about the roof to avoid maintenance and troubles after installation!
Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent troubles after solar panel installation!
2.Equipment Specialized 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 necessary scaffolding materials for temporary scaffolding based on construction conditions, allowing us to 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 residential areas of Chuo Ward, where administration, commerce, and housing gather, our scaffolding team plans scaffolding tailored to the site.
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!
Separation and transportation of waste materials in-house
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By separating and recycling waste materials, we can significantly cut waste disposal costs.
Exterior renovation dedicated showroom
In the showroom, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and see how they are installed on the roofing materials!
It is also possible to simulate the revenue and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that show the structure, allowing for detailed explanations!
3.All Work Performed by Our Own Team
One of Kakeru Koumuten’s major strengths is all work performed by our own team.
From inquiry to completion, everything is handled by Kakeru Koumuten in a consistent manner, allowing for high-quality roofing renovations at reduced costs.
Additionally, one representative will handle everything from the estimate to the completion of the work.
Since the person in charge does not change, whether it is the sales representative or the construction management representative, smooth communication is possible.
We can perform consistent in-house work from temporary scaffolding installation to exterior wall painting and roofing renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry permits and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians on staff, and we are confident in our construction skills.
We are capable of handling large-scale roofing work for factories and other facilities!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty, our solar panel installation work comes with our own workmanship warranty (leakage warranty)!
(The workmanship warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovation is performed. The workmanship warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare maintenance is available annually, 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 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 inspections using a thermal imaging camera.
If the power generation of the solar panels decreases due to dirt, we can also perform cleaning with a specialized brush.
We will respond according to the customer’s wishes.
7. Human Resource Development
To improve skills, we create various roof models and conduct practical training.
Since the construction methods change 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 Clear Materials and Simulations
At Kakeru Koumuten Co., Ltd., we provide not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar installation guidebook” and a “financial simulation” that takes into account loan interest rates and electricity costs.
The financial simulation can project cumulative income and expenses over 20 to 30 years.
Even customers who are not familiar with solar installations will find our materials easy to understand, including important points and potential drawbacks!
We encourage you to obtain comparative estimates and review plans from other companies!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 to 30 years.
Confirming whether it is safe to install them on the current roof is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten Co., Ltd., which specializes in roofing work, has summarized the items to check before installation.
| 1. Type of roofing material and age | The method of securing the panels varies depending on the roofing material, such as slate, tiles, metal roofs, or flat roofs (roof waterproofing). If the remaining lifespan of the roofing material is short, we may suggest a roof renovation first. |
| 2. Condition of the substrate and waterproof sheet | If the sheathing or roofing (waterproof sheet) beneath the roofing material is damaged, it can affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 3. Orientation, slope, and shadows of the roof | The orientation and slope of the roof surface, as well as shadows from neighboring houses, trees, and utility poles, can affect power generation. We can create a layout diagram from the drawings and the site, and you can confirm this with the power generation simulation. |
| 4. Shape of the roof and available installation area | The number of panels that can be installed (installation capacity) is determined by the shape and size of the roof. The number of panels that can be installed varies depending on their size, so we will compare based on the total output of the roof. |
| 5. Method of securing and waterproofing details | We will confirm whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The method of securing varies by technique, so please check the waterproofing treatment for the fastening points 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. |
Securing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets to the roof material and substrate with screws) | Waterproof treatment of fixing parts, cracks or deterioration of slate, condition of the substrate. If deterioration is significant, 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 secure 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, additional costs for removing and reinstalling solar panels will apply. If the roof is deteriorating, renovating to a highly durable roofing material before installation may help reduce costs in the long run.
Kakeru Koumuten Co., Ltd. specializes in roofing work and can also handle the removal and reinstallation of solar panels in-house, so please consult us according to the condition of your roof!
▶ Click here for roof renovations in Chuo Ward, Sagamihara City
PotentialSubsidies and Grants
If you are introducing solar panels or storage batteries in Chuo Ward, you may be eligible for programs from “the national government,” “Kanagawa Prefecture,” and “Sagami-hara City.”
The following information is based on the official pages of each program as of October 6, 2026. The application status may change depending on the budget and recruitment period, so please check the latest information before contracting or starting work.
Eligibility Conditions and Application Timing for Subsidy Programs
| Program | Main Eligibility Conditions | Subsidy Amount | Application Period & Status |
|---|---|---|---|
| Sagamihara City “Reiwa 8 Year Residential Smart Energy Equipment Installation Subsidy” | Solar power generation systems, storage batteries, V2H (connection with solar power generation system is mandatory, applicable to both new and existing), ZEH, etc. Application after project completion, and in case of many applications, lottery | Solar: 80,000 JPY Storage battery or V2H: 200,000 JPY each ZEH: 300,000 JPY (LCCM housing adds 100,000 JPY) |
Phase 1: September 1-30, 2026 (Application closed) Phase 2: February 1-26, 2027 (must arrive) (for installations completed between October 1, 2026, and February 26, 2027) |
| Sagamihara City “Reiwa 8 Year Zero Initial Cost Solar Power Equipment Installation Subsidy” | Businesses registered in advance with the city that install solar power equipment in homes for zero initial cost (lease or power sales). Equipment is generally transferred free of charge after about 10 years | Solar: 70,000 JPY/kW (up to 5 kW), an additional 30,000 JPY/kW for contractors within the city Storage battery: One-third of eligible expenses (maximum 510,000 JPY) |
May 1, 2026 – January 29, 2027 (must arrive) |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation & Storage Battery Installation Subsidy” | Installation of both solar power generation and storage batteries in residential properties within the prefecture. Applications must be made by the individual, and construction can begin after the grant decision | Solar: 70,000 JPY/kW Storage battery: 150,000 JPY/unit |
Phase 1: May 11 – June 30, 2026 Phase 2: September 7 – 30, 2026 (first-come, first-served) Phase 2 has reached its application deadline. Please check the prefecture’s official page for future applications |
| National “DR Home Storage Battery Project” (Reiwa 7 Year Supplement) | New installation of home storage systems that can be used for DR (demand response) with registered products | Calculated based on a standard amount of 34,500 JPY per initial effective capacity of 1 kWh (subsidy rate within 3/10, maximum 600,000 JPY per application) | As of May 29, 2026, the budget has been reached, and applications are closed (currently not accepting applications) |
| National “Mirai Eco Housing 2026 Project” (Renovation) | Storage batteries are one of the eligible facilities, but they must be combined with essential works such as insulation renovation of windows (openings) and 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. Please check the official site for application status |
| Sagamihara City “Reiwa 8 Year Small and Medium-sized Business Energy-saving Equipment Installation Support Subsidy” | Small and medium-sized enterprises with a business office in the city (individual residences are not eligible). Submission of a global warming countermeasure plan is required, and there are special measures for solar power generation and storage batteries. | Subsidy rate within one-third (maximum 1,000,000 JPY) | From May 15, 2026, to October 30, 2026 (Eligible businesses that submitted their plans by September 30, 2026, can apply) |
| Kanagawa Prefecture “Subsidy for Introduction of Self-Consumption Type Renewable Energy for FY2026” | Corporations and individual business owners filing blue returns (individual residences are not eligible). Solar power must have a generation capacity of 10 kW or more, be for business facilities, and not be equipment certified under FIT/FIP. | Solar power: 80,000 JPY/kW, etc. Storage systems: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Application period ended on September 3, 2026 (when the application amount reached the budget amount) |
For Kanagawa Prefecture’s housing subsidies, it is a condition that construction starts only after receiving the “grant decision”, and grants are provided after completion of the work and performance reporting and review. On the other hand, the incentive program in Sagamihara City allows for applications after project completion, with a defined range for the application period and installation completion date, and it will be conducted by lottery. The order of procedures varies by program, and applying does not guarantee a grant, so please confirm before contracting and starting work.
At Kakeru Koumuten, we will guide you on the eligibility conditions and business requirements for each program after confirming them.
Sagamihara City “Incentive for Introduction of Residential Smart Energy Equipment for FY2026”
Sagamihara City provides incentives for those who introduce residential solar power generation systems, stationary lithium-ion storage batteries, V2H, ZEH, etc. Residents of Chuo Ward may also be eligible for the city’s program.
The amount of the incentive is 80,000 JPY for solar power generation systems, and 200,000 JPY each for storage batteries or V2H (storage batteries and V2H must be interconnected with the solar power generation system, regardless of whether they are newly installed or existing), and 300,000 JPY for ZEH (an additional 100,000 JPY for LCCM housing). The planned number of cases for FY2026 is 450 for solar power and 470 for storage batteries and V2H, with half of the applications accepted in each period.
Applications must be made after the project is completed. If there are many applicants, a lottery will be held, and applications are accepted by mail (must arrive) or at the counter.
The first application period for FY2026 (from September 1 to 30, 2026) has ended. The second period is from February 1 to 26, 2027 (must arrive), targeting equipment with installation completion dates from October 1, 2026, to February 26, 2027. Depending on national and prefectural subsidy programs, it may not be possible to combine with the city’s incentives, so please confirm before applying. For detailed eligibility conditions and application methods, please check the official page of Sagamihara City.
👉 Click here for the official page of Sagamihara City
Sagamihara City “Subsidy for Introduction of Zero Initial Cost Solar Power Generation Equipment for FY2026”
Sagamihara City also provides subsidies for a method where businesses bear the initial costs to install solar power generation equipment in residences, allowing homeowners to use it through leasing or electricity sales with “zero initial cost.” After approximately 10 years, the equipment is transferred free of charge.
The subsidy amount for solar power generation equipment is 70,000 yen per kW (up to 5 kW), and for contractors within the city, an additional 30,000 yen per kW is added. The subsidy for storage batteries is one-third of the eligible expenses (up to 510,000 yen). The target is for projects conducted by businesses registered in advance with the city, and the application period is from May 1, 2026, to January 29, 2027 (must arrive by this date).
👉 Click here for the official page of Sagamihara City
National Subsidy “DR Home Storage Battery Project (Support Project for Home Storage System Installation for DR Resource Introduction)”
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 newly introducing registered products’ storage systems that can be utilized for demand response (DR). In the fiscal year 2025 supplementary budget, the subsidy amount is determined based on a standard amount of 34,500 yen per 1 kWh of initial effective capacity, with a subsidy rate of up to 30% and a maximum of 600,000 yen per application. There are also conditions such as exclusion of items contracted or ordered before the grant decision.
However, the fiscal year 2025 supplementary budget application amount reached the budget on May 29, 2026, and the public recruitment has ended (the previous fiscal year’s supplementary budget also ended on July 2, 2025). Applications are currently not accepted, so please check the official site for future recruitment.
Currently, there are no subsidies confirmed for the installation of solar panels for existing homes.
👉 Click here for the official site of the DR Home Storage Battery Project
Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Installation Subsidy”
Kanagawa Prefecture provides subsidies for those who install both “solar panels” and “storage batteries” in their homes.
The subsidy details are 70,000 yen per kW of solar power generation output and 150,000 yen per storage system.
For example, if you install a 4 kW solar panel and one storage battery, the subsidy amount calculation will be 4 kW × 70,000 yen + 150,000 yen = 430,000 yen.
Conditions include that the storage system must be a registered product, if construction begins before the grant decision, it will be excluded, and the application must be made by the individual (proxy applications by contractors are not allowed). The possibility of combining with city incentive funds may vary by program, so please confirm.
In fiscal year 2026, the first period (May 11 to June 30) and the second period (September 7 to September 30, first-come-first-served) were accepted, and the second period has reached its application deadline. For future recruitment, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Sagami-hara City “Fiscal Year 2026 Subsidy for Small and Medium-sized Enterprises Energy-saving Equipment Installation Support” (for businesses)
In Sagamihara City, subsidies are provided for small and medium-sized businesses with offices in the city to support the introduction of energy-saving equipment and renewable energy systems (including solar power generation and storage batteries) for businesses.
Eligible businesses must meet conditions such as having no delinquency in citizen tax or fixed asset tax and submitting a global warming countermeasure plan. Individual residential installations are not eligible.
The subsidy rate is up to one-third (with a maximum of 1,000,000 yen). Special measures apply to solar power and storage batteries.
The application period is from May 15, 2026, to October 30, 2026, and businesses that submit their plans by September 30, 2026, can apply.
Businesses considering the installation of solar panels in stores, offices, or factories within Chuo Ward should check the eligibility conditions for businesses and equipment on the official Sagamihara City page.
👉 Click here for the official Sagamihara City page
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Subsidy for Self-Consumption Type Renewable Energy Introduction” (for businesses)
Kanagawa Prefecture is also providing subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated by solar panels.
Eligible entities are corporations or individual business owners filing 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 equipment certified under FIT or FIP.
The subsidy amount is 80,000 yen per kW for solar power generation and 50,000 yen per kWh for the accompanying storage system (with a maximum of 5,000,000 yen).
As the application amount reached the budget amount for Reiwa 8, the recruitment was closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings within Chuo Ward should check the official Kanagawa Prefecture page for information on the next recruitment.
👉 Click here for details
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | For Costs Related to Solar Panel Installation and Battery Installation, Click Here
⇧Service Menu | For Costs Related to Solar Panel Removal and Water Heater Removal, Click Here
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs.”
Even for the same “Complete Solar Panel Installation,” the amount can vary greatly depending on the installation capacity, equipment grade, and roof condition.
Considerations for Installation Capacity (kW) and Battery Capacity (kWh)
The installation capacity of solar panels is determined by “Output of One Panel (W) × Number of Panels”, with the unit being kW (kilowatts). Batteries are compared based on the amount of electricity they can store, represented in kWh (kilowatt-hours).
The amount of kW that can be installed on a roof varies for each house based on the roof’s shape, orientation, and size. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panels priced at approximately 800,000 JPY to 1,200,000 JPY for 3 to 5 kW, and 1,200,000 JPY to 1,900,000 JPY for 6 to 10 kW. (These are just estimated amounts and may vary based on factors such as wiring length, scaffold range, existing roofing materials, and panel layout.)
▶ Installation Menu | Costs for Solar Panel Installation and Battery Installation
Items to Check in the Quotation (Cost Confirmation)
When comparing prices in multiple quotations, it is common to compare different capacities and equipment. Please check if the following items are clearly stated in each company’s quotation!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, and total installation capacity (kW) should be specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, and 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), and 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 clamps and secures). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, and whether there is a monitor to check the power generation amount. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed parts, and whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | How much support is included for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If it is simultaneous with roof work or exterior painting, check that the same scope and quantity are not double-counted. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters or old panels, and disposal costs for waste materials are included. |
| 10. Tax Classification and Warranty | Whether the price is tax-inclusive or tax-exclusive, conditions under which additional costs may arise, and details and duration of manufacturer and workmanship warranties. |
If the capacities are different, the amounts and power generation will also change. Kakeru Koumuten Co., Ltd. welcome comparisons, so if you bring quotations from other companies, we will explain the differences item by item!
Self-Quotation and Profit and Loss Simulator for Solar Power Generation
With the simulator above,
you can get an estimated quote and income 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 income simulation!
*The simulation results are estimates. Actual income may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Feedback
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Case Studies of Solar Panel Installations
| 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 being provided, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The grant amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| Approximately 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the introduction 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 Chuo Ward, Sagamihara City
There are many solar panel installation contractors available in Chuo Ward, Sagamihara City, and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and storage battery installation work, make sure to check the following 4 points.
● Have extensive knowledge not only about solar panels but also about roofs
● Confirm the presence of warranties and aftercare maintenance
● Obtain estimates from multiple contractors (3 companies as a guideline)
● Check if they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable contractor.
Knowledge about roofs as well as solar panels
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 installed on a severely deteriorated roof causing leaks
・Solar panels installed on a roof with a short lifespan, requiring reinstallation within a few years
・Incorrect treatment due to misjudgment of the type of waterproofing, resulting in leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows you to avoid unnecessary expenses and unexpected troubles.
▶ Go to “Roof Check Before Installing Solar Panels” in this article
Confirm the presence of warranties and aftercare maintenance
When choosing a solar installation contractor, make sure to check for warranties. It is important to confirm not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
While the solar panels and storage batteries come with manufacturer warranties, also check for the presence of a workmanship warranty in case leaks occur after installation!
For contractors that offer a workmanship warranty, if leaks occur after installation and are within the warranty period and conditions, they may cover the repairs under the warranty.
Additionally, some contractors offer after-sales service separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Changes or damages 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 of these hidden areas during after-sales maintenance, it becomes easier to detect issues early, preventing larger repairs or breakdowns!
Kakeru Koumuten Co., Ltd. provides a leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, a roof renovation may be required to provide the warranty.)
We also conduct after-sales maintenance and send out annual direct mail!
Please check the DM, and if you wish, we will visit you for after-sales maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting the installation of solar panels, be sure to obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs may vary, and warranties and after-sales services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request services from your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the items in the estimate”
“Type of solar panels”
“Warranties and after-sales services”
and make a detailed comparison to make your judgment! 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, Equipment, and 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 the Kanagawa Prefecture housing subsidy, where applications cannot be submitted by the contractor and must be done by the individual, it is reassuring to have a contractor that supports the preparation of necessary documents and the flow of procedures.
Complete the procedures specified for each system (for the prefectural housing subsidy, this means obtaining a grant decision) before proceeding with the construction!
For the prefectural housing subsidy, after the construction is completed, a performance report must be submitted, and the grant will be provided after a review! (The flow of procedures varies by system)
▶ To “Subsidies and Grants That May Be Applicable in Chuo Ward” within this Article
Benefits of Introducing Solar Power Systems
The benefits of introducing solar panels are summarized in the following 5 points!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
Although the selling price of electricity has decreased compared to ten years ago, you can benefit by reducing the amount of electricity purchased from the utility company by consuming the generated power yourself!
As electricity costs rise, the ability to cover your consumption with solar power becomes increasingly attractive!
If you plan to use the generated power at night, installing a storage battery is essential!
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 in the 2026 fiscal year. After the 5th year, it is often more advantageous to use the power at home (self-consumption), making the combination with storage batteries a viable option.
👉 For purchase prices, periods, etc., visit the Agency for Natural Resources and Energy
Benefit 2: Utilization of Subsidies!
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 Chuo Ward, you may be eligible for the Sagamihara City Residential Smart Energy Equipment Installation Subsidy and Kanagawa Prefecture subsidies.
Benefit 3: Environmentally Friendly!
Solar power generation has low carbon dioxide emissions and reduces dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (However, devices such as power conditioners may have operational noise.)
Benefit 4: Heat Insulation Effect Expected!!
By installing panels on the roof or rooftop, they block direct sunlight from hitting the roof.
Especially in summer, this can help reduce the temperature rise of the roof, providing a heat insulation effect!
(Note that this does not improve the building’s insulation performance itself.)
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it is possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation capability, you may be able to use electricity from a dedicated outlet during daytime generation.
(Note that the devices, output, and duration that can be used during a power outage vary depending on the model and wiring method.)
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1 Maintenance costs are incurred
A particularly 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 deteriorated, 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 consider maintenance costs in the simulation before introducing solar panels!
Point 2 The risk of leaks increases depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware to the roofing material and substrate with screws, waterproofing of the fixed parts is crucial.
In methods that involve making holes in the roof, the risk of leaks inevitably arises.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, replacing the roofing material with a metal roof and fixing the solar panels using the catch method is also an option. (The catch method has compatibility conditions between the roofing material and hardware, and it cannot be used with all metal roofs.)
Catch-type base metal fittings for horizontal metal roofs
Note 3: The roof will become heavier
Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load-bearing capacity, one option may be to replace it with a lighter roof if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply 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 based on total roof output
When installing solar panels on the roof, it is important to consider how much power can be generated in a limited area, and it is always better to generate more power!
The size and output of solar panels vary by manufacturer.
For example, a 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
However, if the size of the panel does not fit well on the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” leading to different installation capacities on the same roof due to the size difference.
400W × 15 panels = 6kW (total output of the roof)
350W × 20 panels = 7kW (total output of the roof)
As shown above, even if the output of a single panel is lower, the total output of the roof may be higher!
It is important to consider the total output of the roof rather than the output of a single panel!
*The above calculations are for total output (kW). The actual power generation amount (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
How to Choose 2: Compare based on degradation rate of solar panels
Solar panels have a degradation rate, and their output gradually decreases over 10 years and 20 years.
The degree of output reduction after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or power generation amount.
By considering the degradation rate along with the initial output, you can choose solar panels without regrets!
How to Choose 3: Compare based on warranty period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
For output warranties, some manufacturers offer a 30-year warranty, while others provide a 10-year warranty, so it varies widely!
A longer warranty is always better, 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 Chuo Ward
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Chuo Ward. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Sagamihara City, Chuo Ward?
The cost varies depending on the installation capacity, equipment, and roof condition. In the above construction example (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
For cost estimates by capacity, please refer to the 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 Chuo Ward?
As of October 6, 2026, Sagamihara City’s “Reiwa 8 Year Residential Smart Energy Equipment Subsidy” (80,000 yen for solar power, 200,000 yen each for storage batteries or V2H, etc.) has completed the first application period, and the second period is scheduled for February 1 to 26, 2027 (must arrive by this date) (lottery). 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 period of Reiwa 8, and the national DR household storage battery project has ended its public recruitment.
Since the application status may change, please check the subsidies and grants section and consult with us before signing a contract.
Can I apply for subsidies after the construction is completed?
For many programs, procedures are required before construction. The Kanagawa Prefecture subsidy requires “construction to start after the grant decision,” and if you install it beforehand, you will be excluded. On the other hand, the Sagamihara City incentive allows applications after project completion (lottery), but there are specific ranges for the application period and installation completion date.
The order of procedures varies by program, so please confirm before signing the contract and starting construction.
Can solar panels be installed on a slate roof? I’m worried about leaks.
It is possible to install on a slate roof, but it is necessary to check the condition of the roofing material and substrate. The fixing method varies by construction method, and for methods that fix brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten Co., Ltd. is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation and suggest methods such as roof overlay (cover method) or complete replacement if deterioration is progressing.
My roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. If a roof renovation is needed after 10 to 20 years of installation, there will be additional costs for removing and reinstalling solar panels. If the remaining lifespan of the roof is short, renovating to high-durability roofing materials before installation may help reduce total costs.
Please consult us about the installation process after checking the condition of the roof through a site survey!
Should I install a storage battery together with the solar panels?
If you want to use the generated electricity at night or prepare for power outages, simultaneous installation is recommended. The selling price for electricity will be 8.3 yen/kWh after the fifth year, making it more advantageous to use it in your home rather than selling it.
Additionally, the subsidy from Kanagawa Prefecture requires the simultaneous introduction of solar panels and storage batteries, and the incentive from Sagamihara City requires interconnection with the solar power generation system when targeting storage batteries or V2H. You can compare “solar only” and “solar + storage battery” in a financial simulation.
How many kW can I install on my roof? Is it okay for north-facing or shaded roofs?
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.
Central Ward has areas like around Sagamihara Station where commercial facilities and residences are clustered, and the shading from surrounding buildings and trees varies 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 (4.3 kW solar panel + storage battery), it took about 3 days. The duration may vary if roofing work is done simultaneously or depending on the shape of the roof and installation capacity.
Please note that there will be additional time required for applications for subsidies and electric companies, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (less than 10 kW), the selling price from certifications after October 2025 will be 24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year, with the same price applying for the 2026 fiscal year.
The idea is to recover initial costs quickly in the first 4 years and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that takes into account loan interest rates and electricity costs.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-maintenance DM notifications and visits for inspections upon request from customers. We can also clean solar panels using a special brush if the power generation is reduced due to dirt.
The roof is a part that is difficult to check by yourself, so please feel free to consult us if you have any concerns.
Can you also handle renovations for roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten Co., Ltd. can detach and reattach solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them all consistently. The removed panels can be stored in our own warehouse.
For costs, please refer to the solar panel detachment and water heater removal pricing page.
If you are looking for a solar panel installation contractor in Chuo Ward, please consult Kakeru Koumuten
Our company handles a wide range of exterior renovations, including solar panels, roofing work, and exterior wall work in Chuo Ward, Sagamihara City.
We have received requests from many customers, including renovation companies and real estate agencies, who have contacted us!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received great feedback from many customers.
We continue to update our construction performance each year and will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, not only roof overlay work and re-roofing but also partial roof repairs, exterior painting, and exterior wall cover methods.
We are also happy to handle small jobs such as partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide emergency measures without setting up scaffolding, as long as safety can be ensured, so please consult us!
“I want to know about recommended solar panels”, “I want to keep costs down as much as possible”, “I just want an estimate for now”, we will provide the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and will propose the optimal construction plan!
We are confident that we will not be outdone in terms of cost, quality, and planning for exterior work compared to other companies!
We are confident, so we welcome competitive estimates!
Estimates are completely free, and if our company is found to be inferior to others, you are free to decline!
Characteristics of Chuo Ward, Sagamihara City and Points for Solar Work
Chuo Ward in Sagamihara City is a district located in the center of Sagamihara City, where administrative institutions such as the city hall are concentrated. The area around Sagamihara Station has developed as the city’s central commercial area, with green terraces along the Sagami River and farmland on the plateau also spreading out.
We have summarized the characteristics of Chuo Ward and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Chuo Ward in Sagamihara City and points for solar construction
■ A city center where administration, commerce, housing, and industry gather
Profile of Chuo Ward (Sagamiara City Official) states that the area of Chuo Ward is approximately 36.9 square kilometers, accounting for 11.2% of the city area, and it is home to administrative institutions including the city hall. The area around Sagamihara Station has developed as the city’s central commercial area, gathering functions of commerce, administration, and housing, while also having an industrial cluster along the railway and main roads.
The types of housing and building density vary by region. At Kakeru Koumuten, we will check the shape and orientation of the roof and the shadows cast by surrounding buildings on-site, and explain using layout diagrams and power generation simulations.
■ For residences near the station, check for shadows from surrounding buildings
In areas where commercial facilities and apartment buildings are concentrated, the timing of shadows cast by surrounding buildings on the roof can affect power generation. It is reassuring to confirm the movement of shadows by season and time of day through power generation simulations.
■ For residences near green terraces and farmland on the plateau, be cautious of fallen leaves and dirt
The same profile indicates that the Sagami River flows through the southern part of Chuo Ward, and there are green terraces and farmland spreading on the plateau. While areas close to greenery are attractive, roofs near trees are prone to accumulation of fallen leaves and dirt on the panels, which can lead to a decrease in power generation. Kakeru Koumuten can also handle solar panel cleaning with specialized brushes and rain gutter cleaning.
■ Check the condition of the roof according to the age of the building
For residences that have been built for several years, it is important to check the condition of the roofing materials and substrate before installing solar panels. Depending on the condition of the roof, installing them simultaneously with roof renovations can reduce future costs for removing and re-installing solar panels.
■ Different subsidy systems for business buildings such as factories and stores
When installing on business buildings such as factories, warehouses, stores, and offices, there are subsidy systems separate from those for households. The subsidies for small and medium-sized businesses in Sagamihara City are accepted until October 30, 2026, and there are conditions for eligible businesses and equipment.
■ Yokohama’s annual sunshine hours are approximately 2,018 hours
Meteorological Agency’s average values (1991-2020) indicate that Yokohama’s annual sunshine hours are approximately 2,018 hours (this is not the value for Chuo Ward, but for observation points within the prefecture). August has the most hours, while June during the rainy season has the least.
Power generation varies by season, so conducting power generation simulations throughout the year and selecting the capacity of storage batteries to match peak electricity usage times is essential.
Our company is based in Kanagawa Prefecture and handles many exterior construction and solar projects in Chuo Ward, Sagamihara 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 Chuo Ward, Sagamihara City
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and Tokyo.
List of Areas in Chuo Ward, Sagamihara City
Sagamihara City, Chuo Ward, Aioi / Sagamihara City, Chuo Ward, Aoba / Sagamihara City, Chuo Ward, Ohnodai / Sagamihara City, Chuo Ward, Koyama / Sagamihara City, Chuo Ward, Kanumadai / Sagamihara City, Chuo Ward, Kamimizo / Sagamihara City, Chuo Ward, Kamiyabe / Sagamihara City, Chuo Ward, Kyowa / Sagamihara City, Chuo Ward, Koyocho / Sagamihara City, Chuo Ward, Komachido / Sagamihara City, Chuo Ward, Sagamihara / Sagamihara City, Chuo Ward, Shimonukazawa / Sagamihara City, Chuo Ward, Suigodana / Sagamihara City, Chuo Ward, Susukinocho / Sagamihara City, Chuo Ward, Seishin / Sagamihara City, Chuo Ward, Takane / Sagamihara City, Chuo Ward, Tana / Sagamihara City, Chuo Ward, Tanashioda / Sagamihara City, Chuo Ward, Chuo / Sagamihara City, Chuo Ward, Chiyoda / Sagamihara City, Chuo Ward, Namiki / Sagamihara City, Chuo Ward, Hikarigaoka / Sagamihara City, Chuo Ward, Hikawacho / Sagamihara City, Chuo Ward, Higashibuchinobe / Sagamihara City, Chuo Ward, Fujimi / Sagamihara City, Chuo Ward, Fuchinobehoncho / Sagamihara City, Chuo Ward, Fuchinobe / Sagamihara City, Chuo Ward, Hoshigaoka / Sagamihara City, Chuo Ward, Matsugaoka / Sagamihara City, Chuo Ward, Midorigaoka / Sagamihara City, Chuo Ward, Minamihashimoto / Sagamihara City, Chuo Ward, Miyashita Honcho / Sagamihara City, Chuo Ward, Miyashita / Sagamihara City, Chuo Ward, Yasa / Sagamihara City, Chuo Ward, Yabe Shinmachi / Sagamihara City, Chuo Ward, Yabe Shinden / Sagamihara City, Chuo Ward, Yabe / Sagamihara City, Chuo Ward, Yoko Daito / Sagamihara City, Chuo Ward, Yokoyama / Sagamihara City, Chuo Ward, Yuno Daito
・Trust Kakeru Koumuten for exterior wall painting in Sagamihara City, Chuo Ward!
・Trust Kakeru Koumuten for roof renovations in Sagamihara City, Chuo Ward!
・Trust Kakeru Koumuten for exterior renovations in Sagamihara City, Chuo Ward!
・Kakeru Koumuten Co., Ltd. project achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. service menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・Top 12 solar power generation manufacturers! Features and selection tips included!
・What are the installation costs for solar power generation? Comprehensive tips to reduce costs!
・What are the best locations for solar power installation? Key points for site selection included!
・Find out more about solar power generation estimates here!
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contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
