Leave the installation of solar panels in Saiwai-ku, Kawasaki to Kakeru Koumuten Co., Ltd.!

For solar panel and battery installation in
Saiwai-ku, Kawasaki,
Kakeru Koumuten is at your service!

Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
We have handled numerous exterior renovations in Saiwai-ku, Kawasaki,
and we are also entrusted with the installation of solar panels and batteries!
Here, we would like to introduce“Why Kakeru Koumuten is chosen for solar panel installations”.

“How to choose a solar panel contractor in Saiwai-ku”
“About the costs of solar panel and battery installation”
“About the subsidies available for solar system installation in Saiwai-ku”
We will also explain the above three points!

The installation of solar panels carries risks, such as“the occurrence of leaks” and other troubles.
To ensure a satisfactory solar panel installation, it isessential to obtain estimates from at least three companies!

For customers considering the introduction of solar panels in Saiwai-ku, Kawasaki,
this information will definitely be helpful, so please take a look!

Reasons why Kakeru Koumuten is chosen for solar panel installations in Saiwai-ku, Kawasaki

The reasons why our company is entrusted with solar panel installations by customers in Saiwai-ku, Kawasaki
include our unique strengths that cannot be imitated by other companies in solar panel installation.
We have received high praise from many customers.

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

1. We also handle exterior renovations other than solar panel installation!

 
Most troubles such as leaks caused by solar panel installation are due to the lack of knowledge of the solar panel installation contractors.
While contractors specializing in solar panel installation have knowledge about the panels themselves, many lack knowledge regarding the roof and waterproofing at the installation site.
For peace of mind and to avoid maintenance issues or troubles after installation, it is safer to have expertise in roofing!

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

2. Facilities specialized in exterior renovations

At Kakeru Koumuten Co., Ltd., we have prepared the following warehouses and material storage areas to provide solar construction and exterior renovations at low cost and high quality.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.

In-house ownership of scaffolding materials

We own the scaffolding materials necessary for temporary scaffolding required for solar panel installation work, allowing us to set up scaffolding in-house.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also reduce the costs of scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!

Storage of materials in our large in-house 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 canprocure materials at a lower cost!
Additionally, we always have a stock of roofing materials, allowing us torespond quickly in emergencies!

In-house sorting and transportation of waste materials

When installing solar panels, roofing work is often involved, generating various types of waste materials such as paint, wood, and metal.
While most contractors dispose of these materials together, significant cost savings on waste disposal can be achieved by sorting and recycling the waste.

Exterior Renovation Dedicated Showroom

In our 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 for the revenue and installation costs when introducing solar panels!

Since roofing and exterior wall work often accompany each other, we have samples of roofing materials and models that show the structure, allowing us to provide detailed explanations!

3.Complete In-House Construction

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

From inquiry to project completion, everything is handled by Kakeru Koumuten Co., Ltd. This allows us to keep costs down while providing high-quality roof renovations.
Additionally, one representative will assist you from the estimate to the completion of the work.
Since the same person will handle everything, including sales and construction management, smooth communication is possible.

We can provide consistent in-house construction services from temporary scaffolding setup to exterior wall painting and roof renovations!

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 technicians on staff, giving us confidence in our construction techniques.
We are capable of handling large-scale roofing projects such as factories!

5. Warranty and Aftercare

In addition to the manufacturer’s warranty for solar panel installation, we also provide our own rain leak warranty!
Aftercare is available annually, and we send out notification DM every 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 roofing troubles and situations.

If you cannot access the roof due to height, we can utilize a drone to assist!
During rain leak 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 also provide cleaning with a specialized brush.
We will respond according to your preferences.

7. Human Resource Development

We create various roof models to enhance skills and conduct practical training.
Since the construction method varies depending on the shape and slope of the roof, we regularly provide technical training to ensure that each staff member can handle various cases.

Corporate Profile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。...

Potential Subsidies and Grants in Saiwai-ku, Kawasaki City, Kanagawa Prefecture

National Subsidy: “Support Project for the Introduction of Storage Battery Systems in Housing”

The government is implementing the “Support Project for the Introduction of Storage Battery Systems in Housing” to support the installation of storage batteries.

This subsidy provides 30,000 yen per kWh (with a maximum limit of 600,000 yen) for those who install residential storage batteries that meet certain conditions.

Additionally, this program is part of the government’s efforts to promote zero carbon emissions and renewable energy, allowing for further advancement of “self-consumption” of electricity when used in conjunction with solar power generation.

For detailed eligibility requirements and application methods, please check the official website.

👉 Click here for the official website

Kanagawa Prefecture “Subsidy for Solar Power Generation Equipment and Home Storage Battery Installation for Existing Houses”

In Kanagawa Prefecture, subsidies are provided for those who install “solar panels” and “home storage batteries” in existing homes.

The subsidy amount is a flat 40,000 yen for solar power generation equipment only, up to 100,000 yen for storage batteries depending on capacity, and a total of up to 300,000 yen when both are installed simultaneously.

This system is part of measures against global warming and aims to promote the use of renewable energy.

For detailed conditions and application methods, please check the official page of Kanagawa Prefecture.

👉 Click here for details

Kanagawa Prefecture “Subsidy for Self-Consumption Type Solar Power Generation Equipment”

In Kanagawa Prefecture, subsidies are provided for the installation of “self-consumption type” systems that use electricity generated by solar panels at home.

Eligible applicants are those who install solar power generation equipment in existing or newly built homes in the prefecture.

The condition is that at least 30% of the generated electricity must be consumed on-site (installation of storage batteries is also acceptable).

The subsidy amount is 10,000 yen per kW, with a maximum limit of 4 kW (maximum 40,000 yen).

For example, if you install a 3 kW solar panel, you can receive a subsidy of 30,000 yen.

This system aims to promote the use of renewable energy and achieve Kanagawa Prefecture’s “Zero Carbon Society”.

For more details, please check the official page of Kanagawa Prefecture.

👉 Click here for details

Kawasaki City Solar Power Generation Equipment Installation Subsidy (Fiscal Year 7)

■ Eligible Equipment and Amounts

• Solar Power Generation Equipment
  
  　30,000 yen per kW

• Stationary Lithium-ion Storage Battery
  
  　20,000 yen per 1kWh

• V2H Charging and Discharging Equipment
  
  　Flat rate of 100,000 yen

■ Procedure Flow

1. Online Application
   
   　・Submit necessary information online, including the “Application for Grant” (paper applications are not accepted)

2. Submission of Completion Notification
   
   　・Within 30 days of project completion, or by February 13, 2026 (Friday), whichever comes first

3. Submission of Invoice (by mail in paper form)
   
   　・Submit an invoice with the applicant’s seal by March 6, 2026 (Friday)

■ Application Schedule

• Application Acceptance Period：April 14, 2025 (Monday) – December 26, 2025 (Friday)

• Deadline for Submission of Completion Notification：February 13, 2026 (Friday) or within 30 days of project completion

• Deadline for Invoice Submission：March 6, 2026 (Friday)

■ Main Application Conditions and Required Documents

• No delinquency in city or prefectural taxes

• Main documents required for online application:

  • Application form

  • Consent form (if the homeowner and applicant are different)

  • Tax payment certificate or non-taxation certificate

  • Current condition photos before installation

  • A copy of the contract stating the model number and capacity of the equipment

  • Related documents if there are plans to apply for other subsidies

👉 Click here for the official Kawasaki City page

Solar Panel Installation & Battery Installation Price List

⇧ Construction Menu | Click here for the costs of solar panel installation and battery installation

⇧ Construction Menu | Click here for the costs of solar panel removal and water heater removal

Self-Estimate and Profit Simulation for Solar Power Generation

With the simulator above,
you can obtain a rough estimate and a profit simulation for up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the storage battery, you can get a rough estimate and profit simulation!

Customer Testimonials

カテゴリ ‘voice’ は見つかりません

• customer reviews

  

  The craftsmen and their subordinates breathed perfectly, and I felt a sense of mutual trust.

• customer reviews

  

  The response was very fast, so I was able to make a decision right away.

• customer reviews

  

  They were energetic, polite and courteous, and very pleasant to deal with.

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: 5KW class

Base Mounting Hardware Used

Niigata Manufactured/Aluminum Catch Type Hardware

Price Range

2.2 million yen to 2.3 million yen 　*Due to the subsidy provided, the actual burden amount is approximately 1 million yen 　Estimated recovery period for construction costs: Approximately 8 to 9 years (self-consumption)

Construction Period

Approximately 3 days

Completion Month

April 2025

Inquiry Details

I am considering the installation of solar panels and storage batteries. I heard that subsidies are available, and I would like to know how much subsidy can be expected.

How to Choose a Solar Panel Installation Contractor in Saiwai-ku, Kawasaki

There are many solar panel installation contractors available in Saiwai-ku, Kawasaki, and it can be confusing to choose the right one.

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

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

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Knowledge of roofing as well as solar panels

Many causes of poor installation of solar panels stem from a lack of knowledge on the part of the contractor.
While knowledge about solar panels is certainly important, understanding the roofing and waterproofing at the installation site is also crucial.

Check for warranties and after-sales maintenance

When choosing a solar installation contractor, be sure to check for warranties.

While solar panels and storage batteries come with manufacturer warranties, also confirm whether there is a construction warranty in case leaks occur after installation!

If the contractor has a warranty period, they will respond free of charge if leaks occur after installation.

Additionally, some contractors offer after-sales services separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Since abnormalities or damage on the roof may not be visible, you might not notice them yourself.
Conducting after-sales maintenance allows for inspections of hidden areas, enabling early detection of issues and preventing major repairs or failures!

Kakeru Koumuten Co., Ltd. provides a leak warranty as part of the construction guarantee for solar panel installations.
We also conduct after-sales maintenance and send out annual DM!
Please check the DM, and if you wish, we will visit you for after-sales maintenance!

Warranty and Payment翔工務店の屋根工事、外壁塗装工事、シーリング工事の保証など簡単にご説明させて頂いております！！ 弊社では前金、中間金は頂いておりません！！...

Obtain estimates from multiple contractors (at least 3 companies)

When requesting solar panel installation, obtain estimates from multiple contractors.

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

Additionally, obtaining multiple estimates makes it easier to negotiate prices.

To request your preferred repair contractor at a lower price, it is essential to obtain estimates from multiple contractors.

When comparing estimates, please check carefully:

“Verification of estimate items”
“Types of solar panels”
“Warranties and after-sales service”

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

【横浜市】屋根リフォームの相見積もりの重要性と比較するポイントを解説します！こんにちは！株式会社翔工務店です！ 横浜市の屋根リフォーム専門店の翔工務店です！こちらのページでは屋根リフォームの見積りをとる...

Check if they provide support for subsidy applications

Subsidies are often available for the installation of solar panels and storage batteries, but there is a possibility that they may not be granted due to application errors.
If you proceed with the support of the contractor, there should be no issues with the application.
Make sure to apply for the subsidy before the construction starts and proceed with the work after it has been accepted!

After the construction, the flow will be that the subsidy will be decided and granted!

Benefits of Introducing Solar Power Equipment

The benefits of installing solar panels are summarized in the five points below!

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, the rise in electricity costs allows you to benefit from consuming the electricity you generate!
Electricity costs are expected to continue rising, making it attractive to cover your consumption with solar power!
If you plan to use the generated electricity at night, installing a storage battery is essential!

Benefit 2: Subsidies can be utilized!

The conditions and amounts of subsidies vary by prefecture and municipality, but there is a high probability that you can apply for subsidies!
Reducing the actual burden amount through subsidies is a significant advantage!

Benefit 3: Environmentally Friendly!

Solar power generation contributes to the mitigation of global warming by reducing carbon dioxide emissions and dependence on fossil fuels.
It is considered an environmentally friendly method of power generation as it does not produce noise or harmful substances during the generation process.

Benefit 4: Improved Insulation Effect!!

By installing it on the roof or rooftop, insulation performance is enhanced.
Especially in summer, it can effectively block direct sunlight, providing significant heat shielding benefits!

Benefit 5: Electricity Use Possible Even During Power Outages!!

By installing a storage battery, it becomes possible to use electricity during emergencies such as power outages!

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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

The maintenance costs are related more to the roof where the solar panels are installed rather than the solar panels themselves.
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 the solar panels!

It would be comforting 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

Slate roofs and tile roofs require holes to be made in the roof to secure solar panels.
As a result, there is an inherent risk of leaks due to the holes.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, one option is to replace the roofing material with a metal roof and secure the solar panels using the catch method.

Catch-type base hardware for horizontal metal roofs

Note 3: The roof will become heavier

With the addition of solar panels, the roof will become heavier. In the case of tile roofs, it may be reassuring to replace them with lighter roofing materials.

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How to Choose Solar Panels?

There are many manufacturers of solar panels, and their output (power generation) and costs vary.
It is not simply a matter of “this manufacturer has the best solar panels”; what is important is 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 based on total power generation of the roof

When installing solar panels on the roof, it is important to consider how much power can be generated in the limited area, and the more power generated, the better!

Solar panels come in various sizes depending on the manufacturer, and their power generation also differs.
For example, a 350W output panel and a 400W output panel may seem that the higher output panel is better at first glance.
However, if the size of the panels does not fit well on the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” leading to different installation capacities on the same roof due to the size difference.

400W × 15 panels = 6kW (total power output of the roof)
350W × 20 panels = 7kW (total power 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 just the output of a single panel!

How to Choose 2: Compare based on degradation rate of solar panels

Solar panels have a degradation rate, and their power generation gradually decreases over 10 or 20 years.
After 30 years, some may see a 40% decrease in power generation, while others may only decrease by about 10%.
By considering the degradation rate along with the initial power generation, you can choose solar panels without regrets!

How to Choose 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.
For output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
Since longer warranties are generally better, be sure to check the warranties of the manufacturers you are considering!

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If you are looking for a solar panel installation contractor in Saiwai-ku, Kawasaki, please consult Kakeru Koumuten Co., Ltd.

Our company handles many exterior renovations, including solar panels, roof work, and exterior wall work in Saiwai-ku, Kawasaki.
We have received requests from many customers, including renovation companies and real estate agencies, who have contacted us!

Kakeru Koumuten Co., Ltd. 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 is capable of 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 handle small jobs such as partial repairs and rain gutter cleaning!

In case of emergencies such as leak repairs, we may also be able to provide temporary fixes without scaffolding, so please consult us!

“I want to know recommended solar panels,” “I want to keep costs down as much as possible,” “I just want an estimate for now“, we will provide the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s shoes and will 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 construction!
We welcome competitive estimates!
Our estimates are completely free, and if you find our company to be inferior to others, feel free to decline!

Characteristics of Saiwai-ku, Kawasaki

Saiwai-ku, Kawasaki, is located in the eastern part of the city and is an area where nature along the Tamagawa River merges with urban convenience. With a population of about 170,000, it has developed due to its proximity to Kawasaki Station, making it a vibrant area with residential neighborhoods, commercial facilities, and offices. The terrain is relatively flat, and green spaces and parks along the river provide an environment where one can feel close to nature while being in the urban area.

The climate is mild, with relatively gentle winters that are easy to spend, and summers are characterized by pleasant breezes along the Tamagawa River. The weather remains stable throughout the year, creating a comfortable living environment.

In terms of access, the JR Nambu Line, Tokaido Line, and Keihin-Tohoku Line are available, making it very convenient to travel to central Tokyo and Yokohama from Kawasaki Station. Additionally, the bus routes are well-developed, allowing for smooth movement within and outside the ward.

The charm of Aoi-ku lies in its balance between urban functionality and livability. Around Kawasaki Station, there are large commercial facilities and office buildings, offering a wide variety of shopping, dining, and entertainment options. On the other hand, along the Tamagawa River, parks and walking paths are well-maintained, providing a relaxing environment. The residential areas are home to many apartments and single-family homes, making it popular among a wide range of generations from singles to families.

Additionally, educational institutions and medical facilities are well-established, creating a reassuring environment for families with children. The local shopping streets and events are also vibrant, allowing residents to feel a sense of community. In this way, Aoi-ku is a well-balanced and livable area where urban convenience coexists with natural comfort.

Our company handles exterior construction and solar work extensively in Aoi-ku, Kawasaki.
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 Kawasaki City, Aoi-ku

Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.

 

For roofing, guttering, and exterior work and repairs in Kanagawa, contact Kakerukoumuten Co., Ltd..

AAA is a young company with an average age in the early 20s, but our technology is second to none.

One of our greatest strengths is that we can do all of our own scaffolding, roofing, and painting work. In this industry, where work is generally divided, we are able to provide a complete set of services, which saves time and effort in management and reduces costs. Above all, if there is any trouble, we will come to you right away!

We can confidently declare this. We are the youngest and most friendly renovator in Kanagawa!