Leave the installation of solar panels in Odawara City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
For Solar Panel and Battery Installation in
Odawara City,
trust Kakeru Koumuten!
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
As a company strong in roofing work, we are entrusted withsolar panel installation and battery work considering roofing and waterproofing!
“How to Choose a Solar Panel Contractor in Odawara City”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Odawara City”
We will also explain the above three points!
Installing solar panels carries risks such as“the occurrence of leaks” and other troubles.
To ensure a satisfactory solar panel installation, we recommend obtainingquotes from about three companies!
Table of Contents (Tap to Open/Close)
- Reasons Kakeru Koumuten is Chosen for Solar Panel Installation in Odawara City
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Odawara City
- Price List for Solar Panel and Storage Battery Installation
- Breakdown of Installation Capacity, Equipment, and Construction Costs
- Self-Estimate and Profit Simulation for Solar Power Generation
- Customer Testimonials
- Case Studies of Solar Panel Installations
- How to Choose a Solar Panel Installation Company in Odawara 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 Odawara City
- If You Are Looking for a Solar Panel Installation Company in Odawara City, Contact Kakeru Koumuten
- Characteristics of Odawara City and Key Points for Solar Installation
- Service Area in Odawara City
Reasons Kakeru Koumuten is Chosen for Solar Panel Installation in Odawara City
Regarding why our company is entrusted with solar panel installation by customers in Odawara City,
“Our Unique Strengths in Solar Panel Installation That Cannot Be Imitated by Other Companies”
have received high praise from many customers.
Because we are confident, we welcome estimates from any number of companies!
1. We Also Handle Exterior Renovations Beyond Solar Panel Installation!
Issues such as leaks that occur with solar panel installation may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if one is knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside their expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance and troubles after installation!
Kakeru Koumuten is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent issues after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten has prepared the following warehouses and material storage areas to provide low-cost, high-quality solar and exterior renovation work.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house Ownership of Scaffolding Materials
To ensure safety during work on the roof, we own the scaffolding materials necessary for temporary scaffolding based on construction conditions and can assemble scaffolding in-house.
By not outsourcing scaffolding work and using our own scaffolding team, we can also cut costs related to scaffolding work.
We own scaffolding materials for approximately 50 single-family homes!
Even if there are height differences on the site, our in-house scaffolding team will plan the scaffolding according to the local conditions.
Storage of Materials in Our Large Warehouse
We store roofing materials and paints, and we can also store removed solar panels.
By ordering a large quantity of materials at once, we canpurchase materials at a lower cost!
Additionally, we always have a stock of roofing materials, allowing us torespond quickly in emergencies!
Sorting and Transporting Waste Materials In-House
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut waste disposal costs.
Exterior Renovation Dedicated Showroom
In the showroom, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and see how they are installed on roofing materials!
We can also provide simulations of potential earnings and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany renovations, we also have samples of roofing materials and models that explain the structure, allowing us to provide detailed explanations!
3.All Work Performed by Our Own Team
One of Kakeru Koumuten’s major strengths is its complete in-house construction.
By having a consistent system from inquiry to project completion, Kakeru Koumuten can keep costs down while providing high-quality roof renovations.
Additionally, one representative will handle everything from the estimate to the completion of the work.
Since the担当者 does not change, communication can proceed smoothly.
We can provide consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry licenses and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians, and we are confident in our construction techniques.
We can also handle large-scale roof projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation work, we also provide our own construction warranty (leakage warranty)!
(The construction warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovations are performed. The construction warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary based on the warranty details.)
Aftercare is available annually, and we send out notification DM every 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 inspections using a thermal imaging camera.
In cases where the power generation of solar panels decreases due to dirt, we can provide cleaning services using specialized brushes.
We will respond according to the customer’s wishes.
7. Human Resource Development
To improve skills, we create various roof models and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training so that each staff member can handle various cases.
8. Creation of Easy-to-Understand Materials and Simulations
Kakeru Koumuten provides not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar construction guidebook” and “profit and loss simulations” that take into account loan interest rates and electricity costs.
Profit and loss simulations can be created for projected cumulative profits and losses over 20 to 30 years.
Even customers who are not familiar with solar construction will receive easy-to-understand materials that include points to consider and disadvantages!
We encourage you to obtain comparative estimates and review plans from other companies!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 or 30 years.
Confirming “Is it okay to install directly on the current roof?” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | The fixing method varies depending on the roofing materials, such as slate, tiles, metal roofs, and flat roofs (rooftop waterproofing). If the remaining lifespan of the roofing material is short, we may suggest a roof renovation first. |
| 2. Condition of Substrate and Waterproof Sheet | If the sheathing boards or roofing (waterproof sheet) under the roofing material are damaged, it will affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 3. Orientation, Slope, and Shadows of the Roof | The orientation and slope of the roof surface, as well as shadows from neighboring houses, trees, and utility poles, will affect the power generation. We can create a layout diagram from the drawings and on-site, and you can check it with a power generation simulation. |
| 4. Shape of the Roof and Usable Area | The shape and size of the roof determine the number of panels that can be installed (installation capacity). The number of panels that can be installed varies depending on the size of the panels, so 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 fixed parts during the estimate. |
| 6. Weight of the Roof | As panels are added, the roof will become heavier. After investigating the existing roof, substrate, and load-bearing capacity, switching to lighter roofing materials may be an option if necessary. |
| 7. Installation Location of Equipment and Wiring | We will check the installation location of the power conditioner and storage battery, as well as the wiring route to the distribution board. The length of the wiring will also affect costs. |
| 8. Ease of Scaffolding Setup and Delivery Routes | If there are elevation differences on the site, planning for scaffolding and the delivery routes for equipment and materials may require some ingenuity. We will also check the width of the front road and any steps on the site during the on-site survey. |
Fixing Methods and Verification Points by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets to the roof material and substrate with screws) | Waterproof treatment of fixing parts, cracks or deterioration of slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suitable for the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be methods to replace with lighter roofing materials before installation. |
| Metal Roof (Horizontal/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 plan to renovate the roof 10 to 20 years after installation, additional costs for removing and reinstalling solar panels will apply. If the roof is deteriorating, it may be more cost-effective in the long run to renovate to a highly durable roofing material before installation.
Kakeru Koumuten 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 Odawara City
Potential Subsidies and Grants inOdawara City, Kanagawa Prefecture
If you are introducing solar panels or storage batteries in Odawara City, you may be eligible for programs from “the national government,” “Kanagawa Prefecture,” and “Odawara City.”
The following information is based on the official pages of each program as of October 6, 2026. The acceptance status may change based on the budget, so please check the latest information before contracting or starting work.
Eligibility Conditions and Application Period for Subsidy Programs
| Program | Main Eligibility Conditions | Subsidy Amount | Application Period & Status |
|---|---|---|---|
| Odawara City “Reiwa 8 Fiscal Year Key Measures Acceleration Project Subsidy (Residential Self-Consumption Solar Power Generation Equipment (Owned) & Storage Battery)” | Equipment owned and installed in residential properties within Odawara City. Self-consumption rate over 30%. The storage battery must be installed simultaneously with solar power and have a capacity of 20kWh or less. No delinquency on city taxes. Ordering, contracting, or construction before grant decision is not allowed. | Solar Power: 70,000 yen per kW of output (calculated based on the lower output of the panel and power conditioner) Storage Battery: One-third of eligible expenses or the lower amount calculated at 51,600 yen per kWh |
Applications are accepted from May 12, 2026, to December 18, 2026 (as of the update on September 25, 2026, there is no indication of closure on the city’s official page) Cannot be combined with national subsidies. Combining with prefectural subsidies requires individual confirmation. |
| Odawara City “Reiwa 8 Fiscal Year Global Warming Countermeasure Promotion Project Subsidy” (Fixed Menu) | Individuals introducing storage batteries, V2H, fuel cells, electric vehicles, ZEH, etc., in residential properties within the city. The storage battery must be installed with or simultaneously with solar power generation equipment. Application before construction is mandatory. | Storage Battery: 50,000 yen per case V2H: 50,000 yen per case ZEH: 100,000 yen per case, etc. |
The application deadline is January 31, 2027, but as of the update on September 25, 2026, the city’s official page states that applications for storage batteries and ZEH have reached the recruitment limit and are closed (1 case remaining for V2H). |
| Kanagawa Prefecture “Reiwa 8 Fiscal Year Kanagawa Prefecture Residential Solar Power Generation & Storage Battery Installation Subsidy” | Installation of solar power generation and storage systems together in residential properties within the prefecture (with earthquake resistance). Applications must be made by the individual, and construction can begin after grant approval. | Solar Power: 70,000 yen per kW Storage Battery: 150,000 yen per unit |
Phase 1: May 11, 2026, to June 30, 2026 Phase 2: Starts September 7, 2026 (first-come, first-served) As of September 7, 2026, the application amount reached the budget limit, and acceptance has been closed. Please check the prefecture’s official page for future recruitment. |
| National “DR Household Storage Battery Project” (Reiwa 7 Fiscal Year Supplement) | New installation of registered household storage systems that can be utilized for DR (demand response). | Calculated based on an initial effective capacity of 34,500 yen per kWh (subsidy rate within 30% and a maximum of 600,000 yen per application). | As of May 29, 2026, the budget has been reached, and public recruitment has ended (the official site states that there are no plans to reopen public recruitment, and applications are currently not possible). |
| 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 the structure; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities. | Storage Battery: 96,000 yen per unit | Budget will end once the limit is reached. As of October 5, 2026, the application amount for renovations is displayed as 8% of the budget on the official website. Please check the reception status on the official site. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Type Renewable Energy Introduction Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). Solar power must have a generation capacity of 10kW or more, facilities for business use, and equipment not certified under FIT/FIP, etc. | Solar power: 80,000 JPY/kW, etc. Storage system: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Recruitment ended on September 3, 2026 (application amount reached the budget amount) |
In Odawara City, none of the subsidies allow for ordering, contracting, or construction to be carried out before receiving the grant decision. The Kanagawa Prefecture subsidy for housing also requires that construction begins after receiving the “grant decision,” and starting work beforehand will make it ineligible. Additionally, the city’s key measure acceleration project subsidy cannot be combined with national subsidies, and the eligibility for combination varies by system. It is not guaranteed that applying will result in a grant, so please confirm before contracting and starting work.
Kakeru Koumuten will provide guidance on eligibility conditions and application periods for each system after confirming them.
National Subsidy “DR Home Storage Battery Project (Support Project for Introducing Home Storage Systems for DR Resources)”
The government has been implementing the “DR Home Storage Battery Project” to support the installation of home storage batteries.
This program targets those who are introducing newly registered storage systems that can be utilized for demand response (DR), and in the supplementary budget for the fiscal year 2026, the subsidy amount is determined based on a standard amount of 34,500 JPY per initial effective capacity of 1kWh, with a subsidy rate of up to 30% and a maximum of 600,000 JPY per application. There are also conditions such as contracts and orders made before the grant decision being ineligible.
However, the supplementary budget for fiscal year 2026 reached the budget amount for grant applications on May 29, 2026, and the public recruitment has ended. The official website also states that there are no plans to resume public recruitment, and applications are currently not possible. Please check the official website 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 “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Introduction Subsidy”
Kanagawa Prefecture provides subsidies for those who introduce both “solar panels” and “storage batteries” to their homes.
The subsidy details are 70,000 JPY per 1kW of solar power generation, and 150,000 JPY per storage system.
For example, if you introduce a 4kW solar panel and one storage battery, the calculation for the subsidy amount would be 4kW × 70,000 JPY + 150,000 JPY = 430,000 JPY.
The target is residential buildings that ensure seismic performance, and the energy storage system must be a registered product. If construction begins before the grant decision is made, it will be excluded from eligibility, and the application must be made by the individual (applications by contractors on behalf of the individual are not allowed). It is noted on the official page of Odawara City that the subsidy for the acceleration of key measures can be combined with Kanagawa Prefecture’s subsidies, so please confirm the conditions for combination before signing a contract.
For the fiscal year Reiwa 8, the first phase (May 11 to June 30) and the second phase (starting September 7, first come, first served) were accepted, and the second phase was closed on September 7, 2026, when the application amount reached the budget amount. For subsequent recruitment, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Kanagawa Prefecture “Reiwa 8 Fiscal Year Kanagawa Prefecture Subsidy for Introduction of Self-Consumption Type Renewable Energy (for Businesses)”
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners who file blue returns, and the introduction to individual residences is not eligible.
Conditions include that the solar power generation must have an output of 10kW or more and supply electricity to business facilities within the prefecture, and it must not be a facility certified under FIT or FIP.
The subsidy amount is 80,000 yen per kW for solar power generation and 50,000 yen per kWh (up to 5 million yen) for the energy storage system installed together.
For the fiscal year Reiwa 8, the application amount reached the budget amount, so recruitment was closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings in Odawara City should check the official page of Kanagawa Prefecture for the next recruitment.
👉 Click here for details
Odawara City “Reiwa 8 Fiscal Year Key Measures Acceleration Project Subsidy (Household Self-Consumption Type Solar Power Generation Equipment (Self-Owned) and Storage Battery)”
Odawara City is implementing the “Key Measures Acceleration Project Subsidy” for those who introduce self-owned solar power generation equipment and storage batteries to residences within the city.
◎Subsidy Amount◎
● Solar Power Generation Equipment: 70,000 yen per kW of output
● Storage Battery: One-third of the eligible expenses or the lower amount calculated at 51,600 yen per kWh
The subsidy for solar power generation equipment is calculated by multiplying 70,000 yen by the lower value of the output of the panel and the power conditioner. For example, if the lower value is 4kW, the calculation for the solar subsidy would be 4kW × 70,000 yen = 280,000 yen.
The target is self-owned equipment installed in residential properties within Odawara City, with the condition that the self-consumption rate of generated electricity exceeds 30%. The storage battery must be below 20kWh in capacity and installed simultaneously with the solar power generation equipment. It is also required that there are no delinquent city taxes and that the applicant is not a member of organized crime. Additionally, orders, contracts, and construction cannot be carried out before receiving the subsidy grant decision.
The application period is from May 12, 2026, to December 18, 2026, and the city’s official page (updated on September 25, 2026) indicates that applications are currently being accepted. It cannot be combined with national subsidies, and combining it with Kanagawa Prefecture subsidies requires individual confirmation.
For detailed requirements and application methods, please check the official page of Odawara City.
👉 Click here for the official page of Odawara City
Odawara City “Reiwa 8 Fiscal Year Global Warming Countermeasures Promotion Project Subsidy” (Fixed Amount Menu)
Odawara City is also implementing fixed amount subsidies for those who introduce storage batteries, V2H, fuel cells (Enefarm), electric vehicles, ZEH, etc., in residential properties within the city. The subsidy is 50,000 yen per case for storage batteries, 50,000 yen per case for V2H, and 100,000 yen per case for ZEH, with application before construction being mandatory. For storage batteries, it is required that solar power generation equipment is already installed or installed simultaneously.
The application deadline is January 31, 2027, but the city’s official page updated on September 25, 2026, indicates that applications for storage batteries and ZEH have reached the limit and are now closed, with only 1 case remaining for V2H. Please check the city’s official page for future application status.
👉 Click here for the official page of Odawara City
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | Click here for costs related to Solar Panel Removal and Hot Water Heater Dismantling
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and storage batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs”.
Even for the same “Complete Solar Panel Installation,” the amount can vary greatly depending on the installation capacity, equipment grade, and roof condition.
Understanding Installation Capacity (kW) and 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 (kilowatt). Storage batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hour).
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 JPY to 1,200,000 JPY for 3-5 kW, and 1,200,000 JPY to 1,900,000 JPY for 6-10 kW. (These are just estimated amounts and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Service Menu | Click here for costs related to Solar Panel Installation and Storage Battery Installation
Items to Confirm in the Estimate (Cost Verification)
When comparing estimates, it is common to compare different capacities and equipment by only looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW) should be specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also check if it is a type that controls the battery as a unit. |
| 3. Battery | Manufacturer, model number, capacity (kWh), range of use during power outages (whole house or specific circuits), installation location. |
| 4. Mounting Frame and Hardware | Name of the hardware suitable for the roofing material and the method of securing it (whether it involves drilling holes or clamping). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, presence of a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed points, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | Extent of support for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roofing work and exterior painting are done simultaneously, confirm that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters or old panels and the disposal costs of 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 and workmanship warranties. |
If the capacity differs, both the price and power generation will change. Kakeru Koumuten Co., Ltd. welcome competitive estimates, so if you bring estimates from other companies, we will explain the differences by item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can obtain an estimated quote and a profit simulation for up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the battery, you can get an estimated quote and profit simulation!
*The simulation results are estimates. Actual profits may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Voices
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Case Studies of Solar Panel 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, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) ※The grant amount and recovery estimate are based on the system and calculations at the time of construction and may differ under the current system. |
| Construction Period |
| About 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the 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 understood the expected amount of the grant, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Odawara City
There are many solar panel installation contractors available in Odawara City, and you may be unsure which one to choose.
For this reason,when requesting the installation of solar panels or storage batteries, please check the following four points.
● Having extensive knowledge not only about solar power but also about roofs
● Confirming the existence of warranties and aftercare services
● Obtaining estimates from multiple contractors (three companies is a guideline)
● Checking if they provide support for subsidy applications
By confirming the above four points, you will be able to choose a reliable contractor.
Having knowledge about roofs in addition to solar panels
Defective 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
・Installing solar panels on a deteriorated roof, leading to leaks
・Installing solar panels on a roof with a short lifespan, necessitating renovations to detach and reattach the solar panels within a few years
・Misjudging the type of waterproofing and applying incorrect treatment, 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 Verification Before Installing Solar Panels” in this article
Confirming the existence of warranties and aftercare services
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 scope of coverage, exclusions, and cost conditions.
While the solar panels and storage batteries come with manufacturer warranties, it is also essential to check for the existence of a workmanship warranty in case leaks occur after installation!
If the contractor provides a workmanship warranty, they may cover any leaks that occur after installation within the warranty period and conditions.
Additionally, some contractors offer aftercare services separate from warranties, so be sure to check if the contractor you are considering has aftercare services.
Since abnormalities or damages on the roof may not be visible, you might not notice them yourself.
By conducting inspections during aftercare, you can detect abnormalities early, making it easier to prevent major repairs or failures!
Kakeru Koumuten Co., Ltd. offers a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovations are performed.)
We also provide aftercare maintenance, sending out annual direct mail (DM)!
If you check the DM and wish to proceed, we will visit for aftercare maintenance!
Obtain estimates from multiple contractors (3 companies is a guideline)
When requesting solar panel installation, let’s obtain estimates from multiple contractors.
Even with the same manufacturer and the same work content, costs and warranties or after-sales services may vary.
Additionally, obtaining multiple estimates makes price negotiations easier.
To request your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the estimate items”
“Type of solar panels”
“Warranties and after-sales services”
let’s carefully compare and make a judgment! If the rank of auxiliary materials is low or if processes are skipped, costs can be reduced, so avoid judging solely based on price!
▶ Go to “Breakdown of installation capacity, equipment, and construction costs” in this article
Check if they provide support for subsidy applications
There may be subsidies available for solar panel installations and battery installations, but if the order of procedures is incorrect or if there are deficiencies in the documents, there is a possibility that the subsidy will not be granted.
For systems like Kanagawa Prefecture’s housing subsidies, where proxy applications by contractors are not allowed, and personal applications are required, it is reassuring to have a contractor that supports the preparation of necessary documents and the flow of procedures.
Let’s complete the procedures set by the system (for the prefectural housing subsidy, this means obtaining a grant decision) before proceeding with the construction!
For the prefectural housing subsidy, after the construction is completed, a performance report must be submitted, and the flow will be to undergo review before the grant is provided! (The flow of procedures varies by system)
▶ Go to “Subsidies and grants that may be applicable in Odawara City” in this article
Benefits of Introducing Solar Equipment
The benefits of introducing solar panels are as follows!
Benefit 1 Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
The selling price of electricity has decreased compared to ten years ago, but by consuming the electricity generated, you can reduce the amount of electricity purchased from the utility company and gain benefits!
As electricity prices rise, the ability to cover your consumption with solar power becomes attractive!
If you plan to use the generated electricity at night, installing a storage battery is essential!
Furthermore, the selling price (FIT) for residential use (under 10kW) will be set at “24 yen/kWh for the first 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 for the fiscal year 2026. After the fifth year, it is often more advantageous to use it at home (self-consume) rather than sell it, making the combination with a storage battery a viable option.
👉 Ministry of the Environment and Energy | For purchase prices and periods, click here
Advantage 2 Subsidies can be utilized!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the conditions, you may be able to utilize subsidies!
The reduction in the actual burden amount due to subsidies is a significant advantage!
In the case of Odawara City, there is a possibility of being eligible for subsidies from the city and Kanagawa Prefecture.
Advantage 3 Environmentally friendly!
Solar power generation has low carbon dioxide emissions and can reduce dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (There is operational noise from devices like power conditioners)
Advantage 4 Heat insulation effects can be expected!!
By installing on the roof or rooftop, the panels block direct sunlight to the roof.
Especially in summer, it can help reduce the temperature of the roof, providing expected heat insulation effects!
（This does not improve the insulation performance of the building itself）
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it is possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation functionality, you may be able to use electricity from a dedicated outlet during daytime generation.
（The devices, output, and duration that can be used during a power outage vary depending on the model and wiring method）
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1 Maintenance costs can be incurred
A particularly overlooked maintenance cost is for the roof where solar panels are installed.
If you perform roof remodeling 10 to 20 years later, there will be costs for removing and reinstalling the solar panels.
If the existing roof is deteriorated, it is reassuring to remodel it with durable roofing materials before installing solar panels!
Additionally, regular inspections of the equipment, repair or replacement of the power conditioner, and costs for updating due to the deterioration of the storage battery will also be incurred.
It would be reassuring to consider maintenance costs in simulations before introducing solar panels!
Point 2 The risk of leaks may increase depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware with screws to the roofing material or substrate, waterproofing of the fixed parts is crucial.
In methods that create 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 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, replacing it with a lighter roof may also be an option if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply a matter of “this manufacturer has the best solar panels”; it is important to choose solar panels that are suitable for your life plan and building!
Here are some points to consider when comparing solar panels!
Choosing Method 1: Compare by Total Output of the Roof
When installing solar panels on the roof, it is important to know how much power can be generated in a limited area, and the more power generated, the better!
Solar panels vary in size and output depending on the manufacturer.
A panel with an output of 350W and a panel with an output of 400W may seem at first glance that the higher output panel is better.
However, if the size of the panel does not fit well with the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” leading to 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 the 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 by 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.
Choosing solar panels without considering the degradation rate can lead to regrets later!
Choosing Method 3: Compare by Warranty Period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
Regarding output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
It’s always better to have a longer warranty, so let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Odawara City
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Odawara City. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Odawara City?
The cost varies depending on the installation capacity, equipment, and condition of the roof. In the above construction example (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
Guidelines for costs by capacity are published on the solar panel installation 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 Odawara City?
As of October 6, 2026, the Odawara City Priority Measures Acceleration Project Subsidy (70,000 yen per kW for solar power, one-third of the cost for storage batteries, etc.) is accepting applications until December 18, 2026, and cannot be combined with national subsidies. The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power and 150,000 yen per unit for storage batteries) reached its budget limit on September 7 for the second phase of fiscal year 2026, and the national DR home storage battery project has ended its public recruitment.
Since the application status may change, please refer to the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies after the construction is completed?
Both the Odawara City subsidy and the Kanagawa Prefecture subsidy require procedures to be completed before construction. The city subsidy does not allow ordering, contracting, or construction before the grant decision, and the prefectural subsidy also requires “construction to commence after the grant decision,” so starting work beforehand will make you ineligible.
The order of procedures varies by program, so please confirm before signing a contract or starting 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 first. The method of securing the panels varies by installation method, and if using a method that secures brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation, and if deterioration is advanced, we can also propose methods such as roof overlay (cover method) or replacement before installation.
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, the cost for removing and reinstalling solar panels will be incurred separately. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
Is it better to install a storage battery together with solar panels?
For those who want to use the generated electricity at night or prepare for power outages, simultaneous installation is recommended. Since the selling price of electricity will be 8.3 yen/kWh after the fifth year, it is often 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 subsidy for the Odawara City priority measures acceleration project also targets storage batteries with a capacity of 20kWh or less that are installed at the same time as solar power generation equipment. 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.
Odawara City has residential areas in flatlands, as well as locations near mountains and hills, and facing Sagami Bay, so the amount of shadow from surrounding buildings and trees and the installable capacity will differ for each house. You can check the expected power generation through the power generation simulation.
How long will the construction period be?
In the above construction example (solar panel 4.3kW + storage battery), it took about 3 days. The duration may vary if roof work is done simultaneously or depending on the shape of the roof and installation capacity.
Please note that there will be an additional period for applying for subsidies and to the power company, so please consult us early.
What is the current selling price (FIT)?
For residential use (under 10kW), from the certification after October 2025, the first 4 years will be 24 yen/kWh, and from the 5th to the 10th year it will be 8.3 yen/kWh, and the same price will apply for the 2026 fiscal year.
The idea is to recover the initial costs more quickly in the first four years, and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that takes into account loan interest rates and electricity 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 with a dedicated brush if the power generation is reduced due to dirt.
Since it is difficult to check areas on the roof by yourself, please feel free to consult us if you have any concerns.
Can you also renovate roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten can remove and reinstall solar panels ourselves, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them in a consistent manner. The removed panels can be stored in our own warehouse.
For information on costs, please see the solar panel removal and water heater removal pricing page.
If you are looking for a solar panel installation company in Odawara City, please consult Kakeru Koumuten
Our company handles a wide range of exterior renovations in Odawara City, including solar panel installations, roofing work, and exterior wall work.
We have received many requests from customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received positive feedback from numerous customers.
We continue to update our annual construction achievements and will strive to improve quality to satisfy even more customers in the future.
Our company is capable of performing all exterior renovations, not only roof overlay work and re-roofing but also partial roof repairs, exterior painting, and cover installations for exterior walls.
We are also happy to assist with small jobs like partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide 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 optimal solutions for your specific requests.
We will never propose unnecessary work focused on 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 efficiency in exterior construction!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if we are found to be inferior to other companies, you are free to decline!
Characteristics of Odawara City and Points for Solar Construction
Odawara City is described as having mountains connected to the Hakone mountain range in the west, hilly areas called the Soga Hills in the east, the Ashigara Plain where the Sakawa River flows in the center, and facing Sagami Bay in the south, making it a city with a diverse topography of mountains, hills, plains, and sea. We have summarized the characteristics of each area in Odawara City and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Odawara City and points for solar construction
■ The Ashigara Plain along the Sakawa River requires checking the shadows of surrounding buildings and installation capacity for each house
In the center of the city, the Sakawa River flows north and south, and the Ashigara Plain spreads out. In residential areas of the plain, the shadows cast by adjacent buildings and the number of panels that can be installed on the roof (installation capacity) vary from house to house. At Kakeru Koumuten, we create layout diagrams based on blueprints and the actual site conditions, and you can confirm this through our power generation simulation.
■ Sites near the mountainous west and the Soga Hills in the east require attention to tree shadows, fallen leaves, scaffolding, and delivery routes
The city’s weather page mentions that fruit tree cultivation, such as oranges and plums, is practiced in the hilly areas. In sites close to mountains, hills, and trees, it is important to pay attention to the shadows cast and the reduction in power generation due to fallen leaves and dirt. Additionally, for sloped or uneven sites, careful planning of scaffolding and delivery routes for equipment and materials may be necessary. Kakeru Koumuten responds to site conditions with our own scaffolding team and owned scaffolding materials, and we can also handle solar panel cleaning with dedicated brushes and rain gutter cleaning.
■ Coastal areas facing Sagami Bay require prior confirmation of installation locations and equipment specifications
The southern part faces Sagami Bay. When installing in locations close to the sea, it is essential to confirm in advance whether the panels, power conditioners, and storage batteries meet the manufacturer’s installation conditions (such as whether they are in a salt damage-prone area). Please consult us regarding the placement of equipment, taking into account the surrounding environment and information about your residential area available on hazard maps. If you wish to use electricity during power outages, consider installing a storage battery.
■ In a city with varied terrain from mountains to the sea, we confirm roofs and sites individually through on-site surveys
In Odawara City, where the conditions of sites differ between mountains, hills, plains, and coastal areas, the types of roofs, their ages, and surrounding environments vary from house to house. At Kakeru Koumuten, we check the type and condition of the roof and the site conditions before installation, and we propose methods for fixing, waterproofing, and scaffolding planning.
■ Odawara’s annual sunshine hours are about 1,945 hours, and annual precipitation is about 2,000mm
According to the Japan Meteorological Agency’s average values (1991-2020), Odawara’s annual sunshine hours are about 1,945 hours. Monthly, August (about 202 hours) has the most, while June (about 131 hours) and October (about 131 hours) have the least. Additionally, the city’s official page states that the average annual temperature is around 16 degrees, with annual rainfall around 2,000mm, and winters are warmer than Tokyo, with rare snowfall.
Power generation varies with the seasons and weather, so conducting an annual power generation simulation and selecting the capacity of storage batteries to match peak electricity usage times are key points. Since this area also experiences significant rainfall, proper waterproofing of roofs and securing of fittings is crucial.
Our company is based in Kanagawa Prefecture and handles many exterior and solar work projects in Odawara City.
We are happy to assist with partial roof repairs such as roof overlay work, roof replacements, and leak repairs, as well as other repairs! Please feel free to consult us for any sudden troubles!
Service Area in Odawara City
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and Tokyo.
List of Areas in Odawara City
Odawara City Anabe / Odawara City Anabe Shinden / Odawara City Araya / Odawara City Iizumi / Odawara City Iidaoka / Odawara City Ikegami / Odawara City Isoyama / Odawara City Ishibashi / Odawara City Itabashi / Odawara City Irie / Odawara City Enoura / Odawara City Ogi-machi / Odawara City Ogikubo / Odawara City Kotake / Odawara City Oniyanagi / Odawara City Kobune / Odawara City Kazematsuri / Odawara City Kamimachi / Odawara City Kamishinden / Odawara City Kamosoga / Odawara City Kayama / Odawara City Kawai / Odawara City Kōzutsu / Odawara City Kodai / Odawara City Kotohira / Odawara City Komiyama / Odawara City Koyama / Odawara City Kobayashi / Odawara City Sakawa / Odawara City Shimizu Shinden / Odawara City Shimo Oi / Odawara City Shimo Shinden / Odawara City Shimo Hori / Odawara City Juji / Odawara City Jonai / Odawara City Shiroyama / Odawara City Soga Osawa / Odawara City Soga Gishi / Odawara City Soga Kōkai / Odawara City Soga Bessho / Odawara City Soga Yatsu / Odawara City Soga Hara / Odawara City Sobi / Odawara City Takada / Odawara City Tako / Odawara City Tajima / Odawara City Chiyo / Odawara City Nakazato / Odawara City Nakashinden / Odawara City Nakazone / Odawara City Nakacho / Odawara City Nakamurahara / Odawara City Nagatsuka / Odawara City Narita / Odawara City Nishi Otomo / Odawara City Nishi Sakawa / Odawara City Numashiro / Odawara City Nebukawa / Odawara City Nobukiyo / Odawara City Haneo / Odawara City Hamamachi / Odawara City Hayakawa / Odawara City Higashi Otomo / Odawara City Higashigaoka / Odawara City Higashimachi / Odawara City Fukukawa / Odawara City Besshori / Odawara City Horinouchi / Odawara City Honmachi / Odawara City Maekawa / Odawara City Mizuno / Odawara City Midori / Odawara City Minami Itabashi / Odawara City Minami Kamosuga / Odawara City Minamimachi / Odawara City Yatsu / Odawara City Yanagishinden / Odawara City Yahagi / Odawara City Yamanishi / Odawara City Hasenji
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・Trust Kakeru Koumuten for exterior renovations in Odawara City!
・Kakeru Koumuten Co., Ltd. project achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. construction menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・Top 12 solar power generation manufacturers! Features and selection tips included!
・What are the installation costs for solar power generation? Comprehensive tips to reduce costs!
・What are the best locations for solar power installation? Key points for site selection included!
・Check out our 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!
