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

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

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

“How to Choose a Solar Panel Contractor in Mitaka City”
“About the Costs of Solar Panel and Storage Battery Installation”
“Subsidies Available for Solar System Installation in Mitaka 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 obtainingcomparative estimates from about three companies!

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

The reasons why our company is entrusted with solar panel installation by customers in Mitaka City, Tokyo include
one reason being that “Kakeru Koumuten covers Kanagawa and Tokyo as service areas”,
and we have “strengths in solar panel installation that cannot be imitated by other companies”, which has received high praise from many customers.

Because we are confident, we welcome multiple estimates!

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

Troubles 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 you are knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have knowledge about the roof to avoid maintenance and troubles after installation!

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

2.Equipment Specialized 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 assemble scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also reduce the cost of scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
In Mitaka 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 achieve significant cost reductions in waste disposal.

Exterior remodeling 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!
Simulations for potential earnings and installation costs when introducing solar panels are also available!

Since roofing and exterior wall work often accompany each other, we also provide samples of roofing materials and models that illustrate the structure, allowing for detailed explanations!

3.All Work Performed by Our Own Team

One of Kakeru Koumuten’s major strengths is all work performed by our own team.

By maintaining a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof remodeling at reduced costs.
Additionally, one representative will handle everything from the estimate to project completion.
Since the same person will manage sales and construction, smooth communication is ensured.

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

4. Various Permits and Skilled Workers

We have obtained construction industry permits as well as permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting specialists on staff, giving us confidence in our construction techniques.
We are capable of handling large-scale roofing projects such as those for factories!

5. Warranty and Aftercare

In addition to the manufacturer’s warranty for solar panel installation work, we also provide 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 renovation. The workmanship warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary depending on the warranty details.)
Aftercare maintenance is available annually, and we send out notification DM each year.
If you have questions about the warranty, please click on the image above!

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.

Even if we cannot access the roof at high places, we can respond using a drone!
During leakage investigations, we can also conduct inspections using a thermal imaging camera.

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

7. Human Resource Development

We create various roof models for skill improvement 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.

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, we provide not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar installation guidebook” and a “financial simulation” that takes into account loan interest rates and electricity costs.
The financial simulation can project cumulative income and expenses over 20 to 30 years.
Even customers who are not familiar with solar installations will find our materials easy to understand, including important points and potential drawbacks!

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

Roof Inspection Before Installing Solar Panels

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

Securing Methods and Checkpoints by Roofing Material

▶ Click here for roof renovations in Mitaka City, Tokyo

Potential Subsidies and Grants in Mitaka City, Tokyo

If you are introducing solar panels or storage batteries in Mitaka City, Tokyo, there is a possibility that the “National” and “Tokyo Metropolitan” systems may apply.
The following is based on the content confirmed on the official pages of each system as of October 7, 2026. The application status may change due to budget and recruitment periods, so please check the latest information before contracting or starting work.

Eligibility Conditions and Application Timing for Subsidy Programs

Tokyo “Reiwa 8 Fiscal Year Household Solar Power Generation Promotion Project”

In Tokyo, subsidies are provided for those installing solar power generation systems in residential homes through Cool Net Tokyo. The target is systems 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 3.75kW or less (maximum 450,000 yen), and 120,000 yen/kW for more than 3.75kW. Additionally, there are extra items for mounting frames, waterproofing work, and renovation defect insurance. The pre-application period is from May 29, 2026, and the application for grants and performance reports is 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 “Reiwa 8 Fiscal Year 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 kWh for storage battery packages (maximum 1,200,000 yen per household), and 60,000 yen per kWh for additional storage battery units (maximum 720,000 yen per household), with additional amounts for participation in DR demonstrations.

The target is equipment registered with SII (Environmental Collaboration Initiative). If you apply after October 1, 2026, only equipment listed in the Reiwa 8 fiscal year SII registered product list 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 grants and performance reports has already started from June 30, 2026.
👉 Cool Net Tokyo | Official page for storage batteries is here

Mitaka City “Reiwa 8 Fiscal Year New Energy and Energy-Saving Equipment Installation Subsidy”

Mitaka City is providing subsidies for new energy and energy-saving equipment installed in existing homes within the city. The subsidy amount is 10,000 yen per kW for solar power generation equipment (maximum 100,000 yen), and 50,000 yen for storage batteries, with solar thermal water heaters, eco-cute systems, and high-insulation windows also being eligible. The reception for the Reiwa 8 fiscal year has ended as the budget has been reached (as of August 10, 2026, according to the city page, and this article was confirmed as of October 7, 2026).

According to the city’s guidelines, applicants must be residents of Mitaka City or owners of businesses within the city, have no outstanding city taxes, and own the eligible equipment themselves. Applications must be made after the installation of the equipment, and the installation date must be within 12 months. Storage batteries are eligible only if there is a solar power generation system, and it is required that they are not discontinued or transferred for 5 years after installation. This grant cannot be combined with other city subsidies, but can be used in conjunction with national and Tokyo metropolitan subsidies, as long as the total amount does not exceed the eligible expenses.
For information on the availability and details of the program in subsequent years, please check the official page or contact window of Mitaka City.
👉 Click here for the official Mitaka City page (Subsidy for Installation of New Energy and Energy-Saving Equipment)

Solar Panel Installation & Storage Battery Installation Price List

⇧ Service Menu | Click here for costs related to solar panel installation and storage battery installation

⇧ Service Menu | Click here for costs related to solar panel removal and hot water heater removal

Breakdown of Installation Capacity, Equipment, and Construction Costs

It is important to check the costs of solar panels and storage batteries by separating them into “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, the grade of the equipment, and the condition of the roof.

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

The installation capacity of solar panels is determined by “the output of one panel (W) × number of panels”, with the unit being kW (kilowatt). 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 shape, orientation, and size of the roof. 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 approximate amounts and can vary based on wiring length, scaffold range, existing roofing materials, panel layout, etc.)
▶ For installation menu and costs of solar panel and storage battery installation, click here

Items to Check in the Quotation (Cost Confirmation)

When comparing prices in multiple quotations, it is common to compare different capacities and equipment. Please check if the following items are clearly stated in each company’s quotation!

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 Voices

Case Studies of Solar Panel Installations

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

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

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

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

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Knowledge about roofs as well as 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.

▶ 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, let’s confirm the presence of warranties. It is important to check not only the duration of the warranty but also the coverage, disclaimers, and cost conditions.

While the solar panels and storage batteries come with a manufacturer’s warranty, it is also essential to check if there is a workmanship warranty in case leaks occur after installation!

For contractors that offer a workmanship warranty, 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 damage on the roof may occur in areas that are not visible, so there is a possibility that customers may not notice them.
By conducting inspections during after-sales maintenance, we can easily detect changes early and prevent major 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, we may not be able to provide a warranty unless roof renovation is performed.)
We also conduct after-sales maintenance and send out annual direct mail!
After checking the direct mail, if you wish, we will visit you 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 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 a detailed comparison to make your decision! 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

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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 handled by the contractor, as well as systems that require pre-application before installation, so 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 Tokyo subsidies, a pre-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 be reviewed before the grant is awarded! (The procedure varies depending on the system.)

▶ Go to “Subsidies and Grants That May Be Applicable in Mitaka City” within this article

Benefits of Introducing Solar Power Equipment

The benefits of installing solar panels are as follows!

Benefit 1: Economic Advantage

The biggest advantage of installing solar panels is the economic benefit!
While the selling price of electricity has decreased compared to ten years ago, you can gain benefits by reducing the electricity you buy from power companies through self-consumption of generated electricity!
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!

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 tends to be more advantageous to use the electricity at home (self-consumption), making the combination with battery storage a viable option.
👉 For details on purchase prices and periods, visit the Agency for Natural Resources and Energy

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 through subsidies is a significant advantage!
In the case of Mitaka City, there may be applicable programs from the national government and Tokyo Metropolitan Government (the application for the new energy and energy-saving equipment installation subsidy for the 2026 fiscal year has ended).

Benefit 3: Environmentally Friendly!

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

Merit 4 Expect Heat Insulation Effects!!

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

Merit 5 Electricity can be used even during power outages!!

If a storage battery is installed, it is 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.
(The devices, output, and duration that can be used during a power outage vary depending on the model and wiring method.)

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What Points Should Be Noted When Introducing Solar Power Generation?

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

Point 1 Maintenance Costs are Incurred

A particularly easy-to-overlook maintenance cost is for the roof where the 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 ask for a simulation considering maintenance costs before introducing solar panels!

Point 2 The Risk of Leaks Increases Depending on the Roofing Material

The methods for securing slate roofs and tile roofs vary depending on the construction method, but when using screws or other fasteners to secure the roofing material and substrate, waterproofing at the fastening points becomes crucial.
In methods that involve making holes in the roof, there is inevitably 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 itself with a metal roof and secure the solar panels using the catch method. (The catch method has compatibility conditions between the roofing material and the fasteners, and it cannot be used with all metal roofs.)

Catch-type base fasteners for horizontal metal roofs

Note 3: The roof will become heavier

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

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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 the limited area, and the more power generated, the better!

The sizes and outputs of solar panels vary by manufacturer.
For example, a 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
However, if the size of the panel does not fit well with the roof, “20 panels of 350W can be installed, while only 15 panels of 400W can be installed,” meaning that the number of panels that can be installed may differ even on the same roof due to the size difference.

400W×15 panels = 6kW (total output of the roof)
350W×20 panels = 7kW (total output of the roof)
As shown above, even if the output of one panel is lower, the total output of the roof could be higher!

It is important to consider the total output of the roof rather than the output of a single panel!
*The above calculations are for total output (kW). The actual power generation (kWh) will vary depending on conditions such as the roof’s 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 or 20 years.
The degree of output decline after long-term use varies by product. The manufacturer’s output warranty value serves as a standard for guarantees and does not indicate the actual degradation rate or power generation amount.
Choosing solar panels while considering the degradation rate, not just the initial output, will lead to a regret-free decision!

How to Choose 3: Compare by Warranty Period

There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods differ by manufacturer.
Some manufacturers offer a 30-year warranty for output, while others provide a 10-year warranty, so it varies widely!
A longer warranty is always better, so be sure to check the warranty periods and conditions of the manufacturers you are considering!

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

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

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

Our company handles a wide range of exterior renovations, including solar panels, roof work, and exterior wall work in Mitaka City, Tokyo.
We receive requests from many customers, including renovation companies and real estate agencies!

Kakeru Koumuten promises “high-quality renovations at low cost”, and we have received positive feedback from numerous customers.
We continue to update our construction achievements every year, and we will strive to improve quality to satisfy even more customers in the future.

Our company can perform not only roof overlay (cover method) and re-roofing but also partial roof repairs, exterior painting, and exterior wall cover methods, all with our own team.
We are also happy to assist with small jobs like partial repairs and rain gutter cleaning!

In urgent cases like 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 optimal solutions for your specific requests.
We will never propose unnecessary work focused on 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 we are found to be inferior to other companies, you are free to decline!

Characteristics of Mitaka City, Tokyo and Points for Solar Work

The official page of Mitaka City publishes flood hazard maps (external and internal) and landslide hazard maps.
We have summarized the points to consider when installing solar panels and storage batteries in the residential environment of Mitaka City below. (Tap to open)

Our company serves Kanagawa Prefecture and Tokyo, and we handle many exterior and solar projects in Mitaka 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 sudden troubles!

Service Area in Mitaka City, Tokyo

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

We welcome inquiries via LINE as well◎

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