Leave the installation of solar panels in Chuo Ward, Sagamihara City to Kakeru Koumuten Co., Ltd.!
For solar panel and battery installation in
Chuo Ward, Sagamihara City,
Kakeru Koumuten is at your service!
Kakeru Koumuten is a specialized exterior renovation company headquartered in Aoba Ward, Yokohama City.
As a company strong in roofing work, we are entrusted withsolar panel and battery installation considering roofing and waterproofing!
“How to Choose a Solar Panel Contractor in Chuo Ward”
“Costs for Solar Panel and 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 obtainingthree 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
- Potential 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 Installation Company 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 Are Looking for a Solar Panel Installation Company in Chuo Ward, Contact Kakeru Koumuten
- Characteristics of Chuo Ward, Sagamihara City and Points for Solar Installation
- Service Area of Chuo Ward, Sagamihara City
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Chuo Ward, Sagamihara City
Regarding 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 strengths in solar panel installation that cannot be imitated by other companies, which have received high praise from many customers.
so we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome multiple estimates!
1. We Also Handle Exterior Renovations Other Than Solar Panel Installation!
Issues such as leaks that occur during solar panel installation may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if you are knowledgeable about solar panels, there may be cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance and issues 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 issues after solar panel installation!
2.Equipment Specialized for 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 Scaffolding Materials
To ensure safety during work on the roof, we own the scaffolding materials necessary for temporary scaffolding according to construction conditions and can assemble scaffolding in-house.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs for scaffolding work.
We own scaffolding materials for approximately 50 single-family homes!
Even in residential areas of Chuo Ward, where administration, commerce, and housing gather, our in-house scaffolding team will plan scaffolding according 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, you can purchase materials at a lower cost!
Additionally, we always have a stock of roofing materials, so we can respond quickly in emergencies!
In-house sorting and transportation of waste materials
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut down on 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 attached to 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 projects, 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 maintaining a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof renovations at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the same person will manage sales and construction oversight, smooth communication is ensured.
We can provide consistent in-house construction from temporary scaffolding installation to exterior wall painting and roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry licenses and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal workers and painting specialists on staff, giving us confidence in our construction techniques.
We can also handle large-scale roofing projects such as those for factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty 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, we may not be able to provide a warranty unless a roof renovation is performed. The construction warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare 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 roofing troubles and situations.
If you cannot access the roof due to height, we can utilize drones to assist!
During leak investigations, we can also conduct surveys using a thermal imaging camera.
If the power generation of your solar panels decreases due to dirt, we can provide cleaning with a specialized brush.
We will respond according to your preferences.
7. Human Resource Development
To improve skills, we create various roofing 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 not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar construction guidebook” and a “profit and loss simulation” that takes into account loan interest rates and electricity costs.
The profit and loss simulation can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar construction will receive materials that clearly summarize important points 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 to 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 (roof waterproofing). If the remaining lifespan of the roofing material is short, we may suggest roof renovation first. |
| 2. Condition of 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 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 confirm whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The fixing method varies by technique, so please check the waterproofing treatment method for the fixing 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, replacing with lighter roofing materials may be an option if necessary. |
| 7. Installation Location of Equipment and Wiring | We will check the installation locations for the power conditioner and storage battery, as well as the wiring route to the distribution board. The length of the wiring also affects the cost. |
Fixing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (methods such as fixing brackets with screws to the roofing material and substrate) | Waterproofing treatment of the fixing parts, cracks or deterioration of the slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suitable for the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of the tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be methods to replace with lightweight roofing materials before installation. |
| Metal Roof (Horizontal and Vertical) | Fixed with catch-type brackets that grip the roofing material (depends on the combination of roofing material and brackets) | Whether the roofing material and brackets are compatible, installation conditions from the roofing material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a frame | Type and deterioration status of the waterproof layer, waterproofing around the frame. Consider in conjunction with the timing of waterproofing work. |
If you renovate the roof 10 to 20 years after installation, there will be additional costs for removing and reinstalling solar panels. If the roof is deteriorating, renovating to a highly durable roofing material before installation may help reduce costs in the long run.
Kakeru Koumuten 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!
▶ For information on roof renovations in Chuo Ward, Sagamihara City, click here
PossibleSubsidies and Grants
If you introduce solar panels or storage batteries in Chuo Ward, there is a possibility that the systems from “the national government,” “Kanagawa Prefecture,” and “Sagami-hara City” may apply.
The following information is based on the official pages of each system 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 required, applicable to both new and existing), ZEH, etc. Application after project completion, and in case of many applications, lottery | Solar: 80,000 yen Storage battery or V2H: 200,000 yen each ZEH: 300,000 yen (LCCM housing adds 100,000 yen) |
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 Generation Equipment Installation Subsidy” | Businesses registered in advance with the city that install solar power generation 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 yen/kW (up to 5kW), an additional 30,000 yen/kW for contractors within the city Storage battery: One-third of eligible expenses (up to 510,000 yen) |
May 1, 2026 – January 29, 2027 (must arrive) |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and 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 yen/kW Storage battery: 150,000 yen/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) | Newly introducing home storage systems that can be utilized for DR (demand response) with registered products | Calculated based on a standard amount of 34,500 yen per initial effective capacity of 1kWh (subsidy rate within 3/10, maximum 600,000 yen per application) | As of May 29, 2026, the budget has been reached, and the public recruitment has ended (currently, applications cannot be made) |
| 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 yen/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 1/3 (maximum 1,000,000 yen) | May 15, 2026 – October 30, 2026 (Eligible businesses that submitted their plans by September 30, 2026, can apply) |
| Kanagawa Prefecture “2026 Kanagawa Prefecture Subsidy for Self-Consumption Type Renewable Energy Introduction Costs” | Corporations and individual business operators filing blue returns (individual residences are not eligible). Solar power must have a generation capacity of 10 kW or more, for business facilities, and equipment not certified under FIT/FIP. | Solar power: 80,000 yen/kW, etc. Storage systems: 50,000 yen/kWh (maximum 5,000,000 yen) |
Application period ended on September 3, 2026 (when the application amount reached the budget amount) |
For housing subsidies in Kanagawa Prefecture, it is a condition that construction begins only after receiving the “grant decision”, and the grant will be provided after a performance report and review following the completion of the work. On the other hand, the incentive program in Sagamihara City allows for applications after project completion, with fixed application periods and installation completion dates, and it is conducted by lottery. The order of procedures varies by system, and applying does not guarantee a grant, so please confirm before contracting and starting work.
Kakeru Koumuten Co., Ltd. will guide you on the eligibility conditions and business requirements for each system after confirming them.
Sagamihara City “2026 Housing Smart Energy Equipment Introduction Incentive”
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 yen for solar power generation systems, and 200,000 yen 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 yen for ZEH (an additional 100,000 yen for LCCM housing). The planned number of cases for 2026 is 450 for solar power and 470 for storage batteries and V2H, with half of the applications accepted in each period.
Applications are to be made after the project is completed. In case of a large number of applicants, a lottery will be held, and applications can be submitted by mail (must arrive) or at the counter.
The first application period for 2026 (September 1 – 30) 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 systems, it may not be possible to combine with the city’s incentive, 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 Sagamihara City page
Sagamihara City “2026 Housing Zero Initial Cost Solar Power Generation Equipment Introduction Subsidy”
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, known as “zero initial cost.” Generally, after about 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 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 the Introduction of Home Storage Systems for DR Resource Implementation)”
The national government has been implementing the “DR Home Storage Battery Project” to support the installation of home storage batteries.
The target is those who are introducing new registered products of storage systems that can be utilized for demand response (DR), and in the fiscal year 2025 supplementary budget, the subsidy amount is determined based on a standard amount of 34,500 yen per initial effective capacity of 1 kWh, with a subsidy rate of up to 30% and a maximum of 600,000 yen per application. There are also conditions such as that contracts or orders made before the grant decision are not eligible.
However, the fiscal year 2025 supplementary budget reached the budget limit for grant applications on May 29, 2026, and the public recruitment has ended (the previous fiscal year 2024 supplementary budget also ended public recruitment on July 2, 2025). Applications are currently not possible, so please check the official site for future public recruitment.
Additionally, there are currently no subsidies confirmed for the installation of solar panels for existing homes.
👉 Click here for the official site of the DR Home Storage Battery Project
Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Subsidy for Residential Solar Power Generation and Storage Battery Installation Costs”
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 for solar power generation 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 would 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 starts before the grant decision, it will not be eligible, and the application must be made by the individual (applications by contractors on behalf are not allowed). The combination with municipal incentives may vary by system, so please confirm.
In fiscal year 2026, the first phase (May 11 to June 30) and the second phase (September 7 to September 30, first-come-first-served) were accepted, and the second phase 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 Energy-Saving Equipment Installation Support for Small and Medium-Sized Enterprises” (for businesses)
In Sagamihara City, subsidies are being implemented for small and medium-sized businesses with offices in the city to support the introduction of energy-saving equipment and renewable energy facilities (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), and there are special measures for 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 Self-Consumption Type Renewable Energy Introduction Subsidy” (for businesses)
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners filing blue returns, and individual residential installations are not eligible.
Solar power generation must have an output of 10 kW or more and supply electricity to business facilities within the prefecture, and must 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).
For Reiwa 8, the application amount reached the budget amount, and applications were 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 the next application period.
👉 Click here for details
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | For Costs of Solar Panel Installation and Battery Installation, Click Here
⇧Service Menu | For Costs of Solar Panel Removal and Water Heater Removal, Click Here
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and batteries should be checked separately as “Equipment Costs (Equipment Price)” and “Construction Costs”.
Even for the same “Complete Solar Panel Installation,” the amount can vary significantly depending on the installation capacity, equipment grade, and roof condition.
Understanding Installation Capacity (kW) and Battery Capacity (kWh)
The installation capacity of solar panels is determined by “Output of One Panel (W) × Number of Panels”, with the unit being kW (kilowatts). Batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hours).
The amount of kW that can be installed on a roof varies for each house based on the roof’s shape, orientation, and size. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panels as approximately 800,000 yen to 1,200,000 yen for 3-5 kW, and 1,200,000 yen to 1,900,000 yen for 6-10 kW. (These are only approximate amounts and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Service Menu | For Costs of Solar Panel Installation and Battery Installation, Click Here
Items to Confirm in the Estimate (Cost Confirmation)
When comparing estimates, it is common to compare different capacities and equipment. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW). |
| 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 the roofing material and method of securing it (whether it is a method that drills holes or a method that clamps and secures). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, presence of a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed parts, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | 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 roof work and exterior painting are done simultaneously, check that the same scope and quantity are not double-counted. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters and old panels, as well as disposal costs for waste materials, are included. |
| 10. Tax Classification and Warranty | Whether prices are tax-inclusive or tax-exclusive, conditions under which additional costs may arise, details and duration of manufacturer warranty and workmanship warranty. |
If the capacities differ, both the price and power generation will change. Kakeru Koumuten Co., Ltd. welcome comparisons, so if you bring estimates from other companies, we will explain the differences for each item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can obtain a rough 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 obtain a rough estimate and profit simulation!
*The simulation results are approximate. Actual profits may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Testimonials
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Case Studies of Solar Panel Installation
| Work Details |
| Solar Panel Installation Battery Installation |
| Existing Roofing Material |
| Horizontal Metal Roof (Super Galtect) |
| Installation Capacity |
| Solar Panel: 4.3kW Battery: 5kWh range |
| Base Mounting Hardware Used |
| Niigata Manufacturing / Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed using catch type hardware gripping the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY ※Due to the subsidy being granted, the actual burden amount is approximately 1,000,000 JPY Expected recovery period for construction costs: about 8 to 9 years (self-consumption) ※The subsidy amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| About 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that subsidies are available, and I would like to know how much will be granted. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels from the drawings!
The layout diagram shows the arrangement of solar panels when placed on the roof.
Since we can also determine the installation capacity, it allows for power generation simulations and financial simulations.
We have also understood the expected amount of subsidies that will be granted, and we explained this 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, be sure to check the following four 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 (three companies as a guideline)
● Check if they provide support for subsidy applications
By confirming the above four points, you will be able to choose a reliable contractor.
Knowledge about roofs as well as solar panels
Improper installation of solar panels can sometimes 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 installed on a severely deteriorated roof causing leaks
・Solar panels installed on a roof with a short lifespan, requiring remodeling to detach and reattach the solar panels within a few years
・Misjudging the type of waterproofing and applying incorrect treatment, leading to leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows for installation that avoids unnecessary expenses and unforeseen troubles.
▶ Go to “Roof Verification Before Installing Solar Panels” in this article
Confirm the presence of warranties and aftercare maintenance
When choosing a solar installation contractor, be sure to check for warranties. It is important to confirm not only the duration of the warranty but also the scope of coverage, exclusions, and cost conditions.
While 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, they may cover the repairs under the warranty, provided it is within the warranty period and conditions.
Additionally, some contractors offer after-sales service separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Changes or damage on the roof may occur in areas that are not visible, so there is a possibility that customers may not notice them themselves.
By conducting inspections during after-sales maintenance, we can easily prevent major repairs or failures by detecting abnormalities early!
Kakeru Koumuten Co., Ltd. provides a leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovations are performed.)
We also conduct after-sales maintenance and send out annual DM!
Please check the DM, and if you wish, we will visit for after-sales maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting solar panel installation, be sure to obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs may vary, and warranties and after-sales services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request from your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the items in the estimate”
“Type of solar panel”
“Warranties and after-sales services”
and make detailed comparisons to make your judgment! If the rank of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price!
▶ Go to “Breakdown of Installation Capacity and Equipment/Construction Costs” in this article
Check if they provide support for subsidy applications
There may be subsidies available for solar panel installations and battery installations, but if the order of procedures is incorrect or if there are deficiencies in the documents, the grant may not be awarded.
For systems like the Kanagawa Prefecture housing subsidy, 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.
Complete the procedures specified for each system (for the prefectural housing subsidy, this means obtaining grant approval) 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 awarded after a review! (The flow of procedures varies by system)
▶ To “Subsidies and Grants That May Be Applicable in Chuo Ward” in this Article
Benefits of Introducing Solar Power Systems
The benefits of installing solar panels are summarized in the following five points!
Benefit 1: Economic Benefits
The biggest advantage of installing solar panels is the economic benefit!
Although the selling price of electricity has decreased compared to ten years ago, you can benefit by reducing the amount of electricity you buy from the utility company by consuming the electricity you generate!
As electricity prices rise, the ability to cover your consumption with solar power becomes increasingly attractive!
If you plan to use the generated electricity at night, installing a battery storage system is essential!
For residential systems (less than 10 kW), the selling price (FIT) will be set at “24 yen/kWh for the first four years, and 8.3 yen/kWh from the fifth to the tenth year” for certifications after October 2025, and the same price will apply in the 2026 fiscal year. After the fifth year, it is generally more advantageous to use the electricity at home (self-consumption), making the combination with battery storage a viable option.
👉 Ministry of Economy, Trade and Industry | For purchase prices, periods, etc., click here
Benefit 2: Subsidies Can Be Utilized!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the requirements, 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 or Kanagawa Prefecture’s 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 like power conditioners may have operational noise.)
Benefit 4: Heat Insulation Effects Can Be Expected!!
By installing them on the roof or rooftop, the panels block direct sunlight from hitting the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
(Note that this does not improve the building’s insulation performance itself.)
Benefit 5: Electricity can be used even during power outages!!
If a storage battery is installed, it becomes possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with an autonomous operation function, you may be able to use electricity from a dedicated outlet during daytime generation.
(Note that the devices, output, and duration that can be used during a power outage vary depending on the model and wiring method.)
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1: Maintenance costs can be incurred
A 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 reinstalling the solar panels.
If the existing roof is deteriorating, it is reassuring to renovate it with durable roofing materials before installing solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.
It would be reassuring to consider maintenance costs in simulations before introducing solar panels!
Point 2: The risk of leaks increases depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware to the roofing material or substrate with screws, waterproofing of the fixed parts is crucial.
In methods that involve making holes in the roof, there will inevitably be a risk of leaks.
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 a catch method. (The catch method has compatibility conditions between the roofing material and hardware, and it cannot be used with all metal roofs.)
Catch-type base metal fittings for horizontal metal roofs
Note 3: The roof will become heavier
Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load capacity, switching to a lightweight roof may be one 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!
Choosing Method 1: Compare based on 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 come in various sizes and outputs depending on the manufacturer.
For example, a 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
However, if the size of the panels does not fit well on the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” resulting in different 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 amount (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
Choosing Method 2: Compare based on degradation rate of solar panels
Solar panels have a degradation rate, and their output gradually decreases over 10 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!
Choosing Method 3: Compare based on warranty period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
Regarding output warranties, some manufacturers offer a 30-year warranty while others offer a 10-year warranty, so it varies!
Longer warranties are better, so be sure to check the warranty period and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in 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 case study (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
Guidelines for costs by capacity are published on the solar panel and storage battery installation pricing page. We will create a layout diagram from the drawings and on-site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Chuo Ward?
As of October 6, 2026, Sagamihara City’s “Reiwa 8 Housing 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, 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 refer to the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies even after the construction is completed?
For many programs, procedures are required before construction. The Kanagawa Prefecture subsidy requires “commencement of construction after grant decision,” and if you install it beforehand, you will be ineligible. On the other hand, the Sagamihara City incentive allows applications after project completion (lottery), but there are specific periods for application and completion dates.
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 when fixing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a specialist 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?
It depends on the condition of the roof. If a roof renovation is needed after 10 to 20 years of installation, the cost for removing and reinstalling solar panels will be incurred separately. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
Is it better to install a storage battery together with solar panels?
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, Kanagawa Prefecture’s subsidy requires the simultaneous introduction of solar panels and storage batteries, and the incentive from Sagamihara City mandates the interconnection with a solar power generation system when targeting storage batteries or V2H. You can compare “solar only” and “solar + storage battery” through a financial simulation.
How many kW can be installed on my roof? Is it okay for north-facing roofs or roofs with shadows?
The capacity that can be installed varies depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create a layout diagram from the drawings and site survey, and provide you with the installation capacity and power generation simulation.
Chuo 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 will the construction period be?
In the above construction example (solar panels 4.3 kW + storage battery), it took about 3 days. The duration may vary if roof work is done simultaneously or depending on the shape and installation capacity of the roof.
Additionally, please note that separate time is required for applications for subsidies and power companies, so consult us early.
What is the current selling price (FIT)?
For residential use (under 10 kW), the selling price for 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 applied in 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 considers loan interest rates and electricity costs.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-maintenance notices via DM and visits customers who request inspections. We can also clean solar panels with a specialized brush if the power generation has decreased due to dirt.
It can be difficult to check areas on the roof by yourself, so please feel free to consult us if you have any concerns.
Can you renovate a roof that already has solar panels installed?
Yes, we can. Kakeru Koumuten can remove and reinstall solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them consistently. The removed panels can be stored in our own warehouse.
For information on costs, please visit the solar panel removal 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 many exterior renovations, including solar panels, roof work, and exterior wall work in Chuo Ward, Sagamihara City.
We have received requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received great feedback from numerous customers.
We continue to update our construction performance each year, and we will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, including roof overlay work, roof replacement work, partial roof repairs, exterior painting, and exterior cover methods, all by our own team.
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 recommended solar panels”, “I want to keep costs down as much as possible”, “I just want an estimate for now”, we will provide the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and will propose the best construction plan!
We are confident that we will not be outdone by other companies in terms of cost, quality, and organization for exterior work!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if our company is inferior to others, you are free to decline!
Characteristics of Chuo Ward, Sagamihara City and Points for Solar Work
Chuo Ward, 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, and there are green terraces along the Sagami River and farmland on the plateau.
We have summarized the regional 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, Sagamihara City and points for solar work
■ A central area of the city where administration, commerce, housing, and industry gather
Profile of Chuo Ward (Sagamihara City Official) states that Chuo Ward covers an area of approximately 36.9 square kilometers, accounting for 11.2% of the city area, and is home to administrative agencies including the city hall. The area around Sagamihara Station has developed as the city’s central commercial district, gathering functions of commerce, administration, and housing, while also having an industrial concentration along the railway and main roads.
The type of housing and building density varies by region. At Kakeru Koumuten, we will check the shape and orientation of the roof, as well as the shadows cast by surrounding buildings on-site, and provide explanations using layout diagrams and power generation simulations.
■ Check for shadows from surrounding buildings for residential areas near the station
In areas where commercial facilities and apartment buildings are concentrated, the times when shadows from surrounding buildings fall on the roof can affect power generation. It is reassuring to confirm the movement of shadows due to seasons and times of day through power generation simulations.
■ For homes near green terraces and farmland, be cautious of fallen leaves and dirt
The same profile indicates that the Sagami River flows through the southern part of Chuo Ward, which features green terraces and farmland spreading across the plateau. While areas close to greenery are attractive, roofs near trees are prone to accumulating fallen leaves and dirt, 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 roof condition according to the age of the building
For homes 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 state of the roof, installing them simultaneously with roof renovations can help reduce future costs for removing and reinstalling solar panels.
■ Different subsidy systems for business buildings such as factories and stores
When installing solar panels on business buildings such as factories, warehouses, stores, and offices, there is a different subsidy system than for households. Subsidies for small and medium-sized businesses in Sagamihara City are accepted until October 30, 2026, and there are conditions regarding eligible businesses and equipment.
■ Annual sunshine hours in Yokohama are approximately 2,018 hours
According to the Japan Meteorological Agency’s average values (1991-2020), 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 sunshine hours, while June during the rainy season has the least.
Power generation varies by season, so conducting annual power generation simulations and selecting battery capacity to match peak electricity usage times are key points.
Our company is based in Kanagawa Prefecture and has handled many exterior construction and solar power 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 about any sudden troubles!
Service Area in Chuo Ward, Sagamihara City
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and Tokyo Metropolis.
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, Shimokuzawa / 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
・Leave your exterior wall painting in Sagamihara City Chuo Ward to Kakeru Koumuten!
・Leave your roof renovation in Sagamihara City Chuo Ward to Kakeru Koumuten!
・Leave your exterior renovation in Sagamihara City Chuo Ward to Kakeru Koumuten!
・Kakeru Koumuten Co., Ltd. construction achievements
・Kakeru Koumuten Co., Ltd. after maintenance
・Kakeru Koumuten Co., Ltd. construction menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・12 major manufacturers of solar power generation! Introducing features and selection points!
・What are the installation costs for solar power generation? Thorough explanation of tips to reduce costs!
・What are the suitable locations for installing solar power generation? Introducing key points for site selection!
・Here is the introduction to solar power generation estimates!
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contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
