Leave Your Solar Panel Installation Work in Fuchu City, Tokyo to Kakeru Koumuten Co., Ltd.!

For solar panel and storage battery installation in
Fuchu City, Tokyo,
trust Kakeru Koumuten!

Kakeru Koumuten is a company specializing in exterior renovations based in Aoba Ward, Yokohama City.
As a company strong in roofing work, we are entrusted with solar panel and storage battery installation considering roofing and waterproofing!

“How to Choose a Solar Panel Contractor in Fuchu City”
“Costs for Solar Panel and Storage Battery Installation”
“Subsidies Available for Solar System Installation in Fuchu City”
We will also explain the above three points!

Installing solar panels carries risks, such as “the occurrence of leaks” and other troubles.
To avoid regrets, we recommend obtaining estimates from about three companies!

Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Fuchu City, Tokyo

Regarding why we are entrusted with solar panel installation by customers in Fuchu City, Tokyo,
One reason is that “Kakeru Koumuten covers Kanagawa Prefecture and Tokyo as its service areas.”
Additionally, we have “strengths in solar panel installation that cannot be replicated by other companies,” which have received high praise from many customers.

Because we are confident, we welcome estimates from any number of companies!

1. We Can Also Handle Exterior Renovations Other Than Solar Panel Installation!

Troubles such as leaks that occur during solar panel installation may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if you are knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance and troubles after installation!

Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent troubles after solar panel installation!

2.Equipment Specialized for Exterior Renovation

Kakeru Koumuten Co., Ltd. has organized the following warehouses and material storage areas to provide low-cost, high-quality solar work and exterior renovations.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.

In-house Ownership of Scaffolding Materials

To ensure safety during work on the roof, we own the necessary scaffolding materials for temporary scaffolding based on construction conditions, allowing us to set up scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs on scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
In Fuchu City, our own scaffolding team will plan the scaffolding according to the site 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, enabling 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 the roofing materials!
It is also possible to simulate the revenue and installation costs when introducing solar panels!

Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that explain the structure in detail!

3.Complete In-House Construction

One of Kakeru Koumuten’s major strengths is complete in-house construction.

From inquiries to project completion, everything is handled by Kakeru Koumuten in a consistent manner, allowing for high-quality roof remodeling at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the person in charge does not change, whether it be sales or construction management, smooth communication is possible.

We can perform consistent in-house construction from temporary scaffolding installation to exterior wall painting and roof remodeling!

4. Various Permits and Skilled Workers

We have obtained construction industry permits and permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians, and we are confident in our construction skills.
We can also handle large-scale roofing work for factories and other facilities!

5. Warranty and Aftercare

In addition to the manufacturer’s warranty, solar panel installation work comes with our own workmanship warranty (leakage warranty)!
(The workmanship warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty without performing roof renovations. The workmanship warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary based on the warranty details.)
Aftercare maintenance is available annually, and we send out notification DM each year.
If you have any questions about the warranty, please click on the image above!

Maintenance of Solar Power Generation｜Thorough Explanation of Importance, Frequency, and Cost Estimates!When introducing solar power generation, it is essential to consider...

6. Flexible and Prompt Response

Our company is equipped to handle various roof troubles and situations.

If you cannot access the roof at high altitudes, we can utilize a drone to assist!
During leakage investigations, we can also conduct surveys using a thermal imaging camera.

If the power generation of the solar panels decreases due to dirt, we can provide cleaning with a specialized brush.
We will respond according to the customer’s wishes.

7. Human Resource Development

We create various roof models for skill enhancement and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training to ensure that all staff can handle various scenarios.

Company Overview神奈川で家の外装・屋根の工事、修理なら一番若くて親切な株式会社翔工務店にお任せください。 株式会社翔工務店はリフォームを通して美しく理想の生活空間を創るお手伝いをしています。外装改修、外壁塗装、雨樋修理清掃、屋根の塗装や重ね葺き葺き変えなどの部分的な修理まで、お客様のどのようなご要望にも全力でお応えします。...

8. Creation of Clear Materials and Simulations

At Kakeru Koumuten Co., Ltd., in addition to “estimates”, “layout diagrams”, and “power generation simulations”, we also provide a “solar installation guidebook” and a “financial simulation” that takes loan interest rates and electricity costs into account.
The financial simulation can be created for projected cumulative income and expenses over 20 to 30 years.
We compile easy-to-understand materials that include important points and disadvantages for customers who may not be familiar with solar installations!

We encourage you to obtain comparative estimates and review plans from other companies!

Roof Inspection Before Installing Solar Panels

Once solar panels are installed, they will remain on the roof for 20 to 30 years.
Confirming “whether it is okay to install them directly on the current roof” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten Co., Ltd., which specializes in roofing work, has summarized the items to check before installation.

Fixing Methods and Checkpoints by Roofing Material

▶ Click here for roof renovations in Fuchu City, Tokyo

Subsidies and Grants That May Be Applicable inFuchu City, Tokyo

When introducing solar panels or storage batteries in Fuchu City, Tokyo, there is a possibility of being eligible for programs from the “National Government” and “Tokyo Metropolitan Government”.
The following information is based on the official pages of each program as of October 7, 2026. The application status may change depending on the budget and application period, so please check the latest information before contracting or starting work.

Eligibility Conditions and Application Timing for Subsidy Programs

Tokyo “Fiscal Year 2026 Household Solar Power Generation Promotion Project”

Tokyo is providing subsidies for those installing solar power generation systems in residential homes through Cool Net Tokyo. The eligible systems are those using certified solar modules installed newly in residential homes or on their premises, with a capacity of less than 50kW. A pre-application before installation is required.

For existing homes, the subsidy amount is 150,000 yen/kW for up to 3.75kW (maximum 450,000 yen), and 120,000 yen/kW for exceeding 3.75kW. Additionally, there are supplementary items such as installation of mounting frames, waterproofing work, and renovation defect insurance. The pre-application period is from May 29, 2026, and the application for subsidy and performance report is accepted from June 30, 2026, to March 30, 2029. For details on eligible equipment and conditions, as well as the budget status, please check the official page.
👉 Cool Net Tokyo | Official page for solar power generation is here

Tokyo “Fiscal Year 2026 Household Storage Battery Promotion Project”

Tokyo is also providing subsidies for newly installed storage batteries in residential homes. The subsidy amount is 100,000 yen per 1kWh for storage battery packages (maximum 1,200,000 yen per household), and 60,000 yen per 1kWh for additional storage battery units (maximum 720,000 yen per household), with additional amounts for participation in DR demonstrations.

Eligible equipment must be registered with SII (Environmental Collaboration Initiative). If you apply for pre-application after October 1, 2026, only equipment listed in the fiscal year 2026 SII registered products will be eligible. This project is intended for simultaneous installation with solar power, but applications can be made for storage batteries alone. The application for subsidy and performance report has been accepted since June 30, 2026.
👉 Cool Net Tokyo | Official page for storage batteries is here

Fuchu City “Fiscal Year 2026 Eco-House Equipment Installation Subsidy”

Fuchu City is implementing the Eco-House Equipment Installation Subsidy as a subsidy for eco-house equipment installed in homes. The subsidy amount is 20,000 yen per 1kW for solar power generation systems (maximum 100,000 yen), and 20,000 yen per 1kWh for storage batteries (maximum 100,000 yen). As of October 7, 2026, the application has ended as the budget limit has been reached.

According to the city’s information, the conditions include residing in a house equipped with unused eco-house facilities and not being in arrears on local taxes. Applications must be made within one year from the day after the installation of the equipment, which is a post-installation application, and only one grant can be received for the same type of equipment within the same household. If you receive other subsidies, the grant amount must not exceed the installation costs.
Please check the official page or window of Fuchu City for the existence and details of the system in the following years.
👉 Here is the official page of Fuchu City (Eco-house equipment installation subsidy)

Solar Panel Installation & Battery Installation Price List

⇧Service Menu | For costs related to solar panel installation & battery installation, click here

⇧Service Menu | For costs related to solar panel removal & water heater removal, click here

Breakdown of Installation Capacity, Equipment, and Construction Costs

The costs for solar panels and storage batteries should be confirmed by separating “equipment costs (device costs)” and “construction costs”.
Even for the same “solar panel installation set,” the amount can vary significantly depending on the installation capacity, equipment grade, and roof condition.

Considerations for Installation Capacity (kW) and Storage Battery Capacity (kWh)

The installation capacity of solar panels is determined by “output of one panel (W) × number of panels”, with the unit being kW (kilowatts). Storage batteries are compared in terms of the amount of electricity they can store, expressed in kWh (kilowatt-hours).
The amount of kW that can be placed on the roof varies for each house depending on the roof shape, orientation, and size. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.

On our pricing page, we list solar panels at approximately 800,000 JPY to 1,200,000 JPY for 3 to 5 kW, and 1,200,000 JPY to 1,900,000 JPY for 6 to 10 kW. (These are just approximate amounts and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Installation Menu | Click here for costs of solar panel and storage battery installation

Items to Confirm in the Estimate (Cost Confirmation)

When comparing estimates, it is common to compare different capacities and equipment just by looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!

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 the solar panels on the roof and the capacity of the storage 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 Testimonials

Case Studies of Solar Panel Installations

How to Choose a Solar Panel Installation Contractor in Fuchu City, Tokyo

There are many solar panel installation contractors available in Fuchu City, Tokyo, and you may be unsure which contractor to choose.

Therefore, when requesting solar panel installation and battery storage installation work, let’s check the following 4 points.

By confirming the above 4 points, you will be able to choose a reliable contractor.

Which Solar Power Installation Company is Best? Introducing How to Choose Without Regret!When considering the introduction of solar power generation, the mos...

Have knowledge not only about solar panels but also about roofs

Defective installation of solar panels can sometimes be caused by a lack of knowledge and confirmation regarding roofs and waterproofing.
While knowledge about solar panels is certainly important, understanding the roof and waterproofing at the installation site of the solar panels is also crucial.

▶ Go to “Roof Check Before Installing Solar Panels” in this article

Confirm the existence of warranties and aftercare maintenance

When choosing a solar installation contractor, let’s confirm the existence of warranties. It is important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.

While the solar panels and battery storage units come with manufacturer warranties, also check for the existence of workmanship warranties in case leaks occur after installation!

For contractors that offer workmanship warranties, if leaks occur after installation, they may be able to respond 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 damages on the roof can occur in areas that are not visible, so you may not notice them yourself.
By conducting inspections during after-sales maintenance, you can easily detect issues early, preventing larger repairs or failures!

Kakeru Koumuten Co., Ltd. provides a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, a roof renovation may be required to provide the warranty.)
We also conduct after-sales maintenance and send out DM every year!
Please check the DM, and if you wish, we will visit for after-sales maintenance!

About Kakeru Koumuten Co., Ltd. WarrantyKakeru Koumuten Co., Ltd. provides a simple explanation of our roof construction, exterior wall painting, and sealing work guarantees!! We do not require any advance or interim payments!!...

Obtain estimates from multiple contractors (3 companies as a guideline)

When requesting the installation of solar panels, be sure to obtain estimates from multiple contractors.

Even for the same manufacturer and the same construction content, costs may vary, as well as warranties and after-sales services.

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, please check the following:

“Check the items in the estimate”
“Type of solar panel”
“Warranties and after-sales services”

Make sure to compare these details carefully! If the quality of the auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making decisions based solely on price!

▶ Go to “Breakdown of Installation Capacity, Equipment, and Construction Costs” in this article

[Yokohama City] The Importance of Comparing Estimates for Roof Renovation and Key Points to Consider! /* ===== 翔工務店｜横浜市 屋根リフォーム見積もり記事（貼り付け専用・JIN干渉対策済） ===== */ #toc_co...

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 subsidy may not be granted.
There are systems that require personal applications and cannot be submitted by the contractor, as well as systems that require prior application before installation, so it is reassuring to have a contractor who can support you with the preparation of necessary documents and the flow of procedures.
Complete the procedures specified for each system (for Tokyo subsidies, a prior application before installation is required) before proceeding with the construction!

In the case of subsidies in Tokyo, the process involves submitting a grant application and performance report after the completion of the work, which will then be reviewed before the grant is awarded! (The procedure may vary depending on the system.)

▶ Go to “Subsidies and Grants Available in Fuchu City” within this article

Benefits of Introducing Solar Power Equipment

The benefits of introducing solar panels are summarized in the following five points!

Benefit 1: Economic Advantage

The biggest advantage of introducing solar panels is the economic benefit!
Although the selling price of electricity has decreased compared to ten years ago, you can benefit by reducing the amount of electricity purchased from the utility company by consuming the generated power yourself!
As electricity costs rise, the ability to cover your consumption with solar power becomes increasingly attractive!
If you plan to use the generated power at night, the installation of 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 2026 fiscal year. After the fifth year, it is generally more advantageous to use the power at home (self-consumption), making the combination with a storage battery a viable option.
👉 Ministry of the Environment | 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 criteria, you may be able to utilize subsidies!
Reducing the actual burden amount through subsidies is a significant advantage!
In the case of Fuchu City, there may be national and Tokyo metropolitan government programs available (the Eco House Equipment Installation Subsidy for Fuchu City has ended for the 2026 fiscal year).

Benefit 3: Environmentally Friendly!

Solar power generation has low carbon dioxide emissions and reduces dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (However, devices such as power conditioners may produce operational noise.)

Benefit 4: Heat Insulation Effects Can Be Expected!!

By installing the panels on the roof or rooftop, they block direct sunlight from hitting the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
(Note that this does not improve the insulation performance of the building itself.)

Benefit 5: Electricity can be used even during power outages!!

If a storage battery is installed, it becomes possible to use electricity even during emergencies like power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation capability, you may be able to use electricity from a dedicated outlet during daytime generation.
(Note that the devices, output, and duration that can be used during a power outage vary depending on the model and wiring method.)

What are the Benefits of Installing Solar Panels? An Explanation of the Surprisingly Unknown Disadvantages!In recent years, due to rising electricity costs, increased environm...

What points should be noted when introducing solar power generation?

Next, we will explain the “three points to note” when installing solar panels!

Point 1: Maintenance costs can be incurred

A maintenance cost that is particularly easy to overlook is the roof where the solar panels are installed.
If you perform roof remodeling 10 to 20 years later, there will be costs for removing and reattaching the solar panels.
If the existing roof is deteriorated, it is reassuring to remodel it with durable roofing materials before installing solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.

It would be reassuring to ask for a simulation that considers maintenance costs before introducing solar panels!

Point 2: The risk of leaks increases depending on the roofing material

The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware to the roofing material and substrate with screws, waterproofing of the fixed parts is crucial.
In methods that involve making holes in the roof, the risk of leaks inevitably arises.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, replacing the roofing material with a metal roof and fixing the solar panels using the catch method is also an option. (The catch method has compatibility conditions between the roofing material and hardware, and it cannot be used with all metal roofs.)

Catch-type base hardware for horizontal metal roofs

Note 3: The roof will become heavier

Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load-bearing capacity, replacing it with a lighter roof may be one option if necessary.

13 Common Troubles with Solar Power Installation! Introducing Solutions and Preventive Measures!By installing solar power generation at home, you can expect various...

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 power can be generated in a limited area, and it is always better to generate more power!

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 one with higher output 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,” 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 one panel is lower, the total output of the roof may be higher!

It is important to consider the total output of the roof rather than the output of a single panel!
*The above is a calculation of total output (kW). The actual power generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.

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 itself.
Choosing solar panels while considering the degradation rate, rather than just the initial output, will lead to a regret-free selection!

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 the output warranty, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
Since a longer warranty is generally better, let’s check the warranty periods and conditions of the manufacturers you are considering!

Does solar power generation work on rainy days? Tips to prevent a decrease in power generation!For those considering the introduction of solar power generation, yo...

Frequently Asked Questions about Solar and Storage Battery Installation in Fuchu City

We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Fuchu City. (Tap to open the answers)

If you are looking for a solar panel installation contractor in Fuchu City, please consult Kakeru Koumuten

Our company handles a wide range of exterior renovations, including solar panels, roof work, and exterior wall work in Fuchu City, Tokyo.
We receive requests from many 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 can perform all exterior renovations, not only roof overlay work and re-roofing but also partial roof repairs, exterior painting, and exterior cover methods.
We are also happy to assist with small jobs such as partial repairs and rain gutter cleaning!

In urgent cases such as leak repairs, we may be able to provide emergency measures without setting up scaffolding, as long as safety can be ensured, so please consult us!

“I want to know about recommended solar panels”, “I want to keep costs down as much as possible”, “I just want an estimate for now”, we will provide optimal solutions for specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and propose the best construction plan!

We are confident that we will not be outdone in terms of cost, quality, and organization compared to other companies in exterior work!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if our company is found to be inferior to others, you are free to decline!

Characteristics of Fuchu City, Tokyo, and Points for Solar Work

The official page of Fuchu City publishes hazard maps for water damage (flooding from the Tamagawa River and internal water flooding) and landslide hazards.
We have summarized the points to be careful about when installing solar panels and storage batteries in Fuchu City’s residential environment below. (Tap to open)

Our company serves Kanagawa Prefecture and Tokyo, and we handle many exterior construction and solar projects in Fuchu City, Tokyo.
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 urgent issues!

Service Area in Fuchu City, Tokyo

Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and all of Tokyo.

We welcome inquiries via LINE as well◎

LINE

We are also updating our Instagram regularly◎Please follow us◎

Instagram