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

For solar panel and battery installation in
Higashiyamato 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 withsolar panel and battery installation considering roofing and waterproofing!

“How to Choose a Solar Panel Contractor in Higashiyamato City”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Higashiyamato 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 you have no regrets about your solar panel installation, we recommend obtainingestimates from about three companies!

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

The reasons why our company is entrusted with solar panel installation by customers in Higashiyamato City, Tokyo include
one reason being that “Kakeru Koumuten covers Kanagawa Prefecture and Tokyo as its service area”,
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 estimates from any number of companies!

1. We Can Also Handle Exterior Renovations Aside from Solar Panel Installation!

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

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

2.Facilities Specialized in 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 scaffolding construction costs.
We have scaffolding materials for approximately 50 single-family homes!
In Higashiyamato 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, since we always have stock of roofing materials, we can ensurequick responses 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!
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 show the structure, allowing for detailed explanations!

3.All Work Performed by Our Own Team

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

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 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 projects such as factories!

5. Warranty and Aftercare

In addition to the manufacturer’s warranty, our solar panel installation work comes with our own workmanship warranty (leakage warranty)!
(The workmanship warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovation is performed. The workmanship warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare maintenance is available annually, and we send out notification DM each year.
If you have 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

We are 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 enhancement and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly conduct technical training to ensure that each staff member can handle various cases.

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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 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 or 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, which specializes in roofing work, has summarized the items to check before installation.

Securing Methods and Checkpoints by Roofing Material

▶ Click here for roof renovations in Higashiyamato City, Tokyo

PotentialSubsidies and Grants

When introducing solar panels or storage batteries in Higashiyamato City, Tokyo, there is a possibility of being eligible for “national” and “Tokyo Metropolitan” programs.
The following information is based on the official pages of each program 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 Year Household Solar Power Generation Promotion Project”

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

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

Tokyo “Reiwa 8 Year Household Storage Battery Promotion Project”

Tokyo is also providing subsidies for newly installed storage batteries in residential properties. 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 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. Applications for grants and performance reports have been accepted since June 30, 2026.
👉 Cool Net Tokyo | Official page for storage batteries

About Higashiyamato City Subsidies

As of October 7, 2026, there was no confirmation on the official page of Higashiyamato City regarding the city’s unique subsidies for residential solar power generation and storage batteries.

If you are installing solar panels or storage batteries in Higashiyamato City, the above Tokyo subsidies will be the main focus. The city’s programs may change annually, so please check the official page or contact the city office to see if new programs have started.
👉 Higashiyamato City Official Website

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 Water Heater Removal

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 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 (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 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 panel installation costs as follows: for 3–5 kW, 800,000 JPY to 1,200,000 JPY; for 6–10 kW, 1,200,000 JPY to 1,900,000 JPY. (These are just estimated amounts and may vary based on wiring length, scaffold area, existing roofing materials, panel layout, etc.)
▶ Installation Menu | Costs for Solar Panel and Storage Battery Installation

Items to Check in the Estimate (Cost Verification)

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

Self-Estimate and Profit Simulation for Solar Power Generation

With the simulator above,
you can get an estimated quote and income simulation for up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the storage battery, you can get an estimated quote and income simulation!
*The simulation results are estimates. Actual income may vary depending on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection and replacement.

Customer Voices

Installation Examples of Solar Panels

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

There are many solar panel installation contractors available in Higashiyamato 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 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, exclusions, and cost conditions.

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

For contractors that offer a workmanship warranty, if leaks occur after installation, they may be able to respond under the warranty, provided it is within the warranty period and conditions.

Additionally, some contractors offer after-service separate from the warranty, so make sure to check if the contractor you are considering has after-service.
Changes or damages 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 in after-maintenance, even in areas that are not visible, it becomes easier to detect abnormalities early, preventing major repairs or breakdowns!

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-maintenance and send out annual DM!
After checking the DM, if you wish, we will visit for after-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-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 estimate items”
“Type of solar panels”
“Warranties and after-services”

and make a detailed comparison to make your judgment! If the rank of auxiliary materials is low or if steps 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

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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 applied for by the contractor, as well as systems that require prior 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’s subsidy, prior application before installation) 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 granted after a review! (The procedure varies depending on the system.)

▶ Go to “Subsidies and Grants that May Be Applicable in Higashiyamato 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!
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, 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 in the 2026 fiscal year. After the fifth year, it is generally more advantageous to use it at home (self-consumption), making the combination with storage batteries a viable option.
👉 For purchase prices and periods, click here

Benefit 2: You Can Utilize Subsidies!

The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the criteria, you may be able to utilize subsidies!
The reduction of the actual burden amount through subsidies is a significant advantage!
In the case of Higashiyamato City, there may be applicable programs from the national government and Tokyo Metropolitan Government (the city’s unique subsidies for residential solar power and storage batteries have not been confirmed on the city’s official page).

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 like power conditioners may have operational noise.)

Benefit 4: Expect Heat Insulation Effects!!

By installing 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 building’s insulation performance itself.)

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

If a storage battery is installed, it becomes possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with 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.)

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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 can be incurred

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

It would be reassuring to consider maintenance costs in simulations before introducing solar panels!

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

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

Catch-type base metal fittings for horizontal metal roofs

Note 3: The roof will become heavier

Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load capacity, replacing 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!

How to Choose 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 generating more power is always better!

The size and output of solar panels vary by manufacturer.
For example, a 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
However, if the size of the panel does not fit well 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 installation capacities on the same roof due to the size difference.

400W×15 panels = 6kW (total output of the roof)
350W×20 panels = 7kW (total output of the roof)
As shown above, even if the output of 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 calculations are for total output (kW). The actual power generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.

How to Choose 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 itself.
By not deciding solely based on initial output and considering the degradation rate, you can choose solar panels without regrets!

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 vary by manufacturer.
Regarding the output warranty, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies!
It’s always better to have a longer warranty, so let’s 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 Higashiyamato City

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

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

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

Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received great feedback from 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 all exterior renovations, including roof overlay work, roof replacement work, partial roof repairs, exterior painting, and exterior cover methods, all by our own team.
We are also happy to 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“, and other specific requests will be met with optimal solutions.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s shoes and propose the best construction plan!

We are confident that we will not be outdone in terms of cost, quality, and efficiency 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 Higashiyamato City, Tokyo, and Points for Solar Construction

Higashiyamato City is located in the Tama region. The official page of Higashiyamato City provides a flood and landslide hazard map.
Below are points to consider regarding the residential environment of Higashiyamato City and when installing solar panels and storage batteries (tap to open).

Our company serves Kanagawa Prefecture and Tokyo, and we handle many exterior and solar construction projects in Higashiyamato 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 for any sudden troubles!

Service Area in Higashiyamato City, Tokyo

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

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