If you are looking for a
skylight contractor in
Kakeru Koumuten
Kakeru Koumuten is a company that performs
everything from temporary scaffolding setup to
roof work and skylight installation with complete in-house construction.
We have received numerous requests for skylight repairs and replacements in Aoba-ku, Yokohama.
We respond promptly to urgent skylight repairs, such as leaks from skylights (top lights),
and emergency measures as well.
“About subsidies available for skylight work in Aoba-ku”
“About the costs of skylight repairs and replacements”
“Reasons why Kakeru Koumuten is chosen in Aoba-ku”
If you live in Aoba-ku and are considering a skylight replacement,
this information will definitely be helpful, so please take a look!
To conclude, the most important thing when considering skylight work is
“multiple estimates”!
Let’s obtain at least three estimates from skylight repair contractors covering Aoba-ku!
Reasons why Kakeru Koumuten is chosen for skylight work in Aoba-ku, Yokohama

One of the reasons we are entrusted with skylight repairs in Aoba-ku is that
“being a roofing company in Yokohama” is one reason, but
“our unique approach to skylight replacement work that cannot be imitated by other companies”
has received high praise from many customers.
“cost, quality, and plans” are our absolute strengths,
1. Facilities specialized in exterior renovations
Kakeru Koumuten Co., Ltd. has prepared the following warehouses and material storage areas to provide low-cost, high-quality exterior renovations such as skylight installations.
We have established five bases centered around Yokohama City for our material storage and showrooms.
In-house scaffolding materials
We own the scaffolding materials necessary for temporary scaffolding required for skylight installations, allowing us to set up scaffolding in-house.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can cut costs on scaffolding work and respond quickly in emergencies.
We have enough scaffolding materials for approximately 50 houses!
Storage of materials in our large in-house warehouse
We store materials used for exterior renovations.
By ordering a large quantity of materials at once, we can purchase materials at a lower cost!
Additionally, we always have stock available, allowing us to respond quickly in emergencies!
In-house Waste Separation
During skylight construction, various waste materials such as roofing materials, glass, and wood are generated.
While most contractors dispose of them all together, by separating and recycling waste materials, we can significantly cut down on waste disposal costs.
Showroom Dedicated to Exterior Renovations
In our showroom, not only can you have meetings, but
you can also directly check the actual roofing materials and colors.
You can also perform color simulations for exterior painting and check heat insulation properties using a heat insulation testing machine!
2. Complete in-house construction for skylight installation
One of Kakeru Koumuten’s major strengths is our complete in-house construction.
From inquiries to project completion, everything is handled by Kakeru Koumuten in a consistent manner, allowing us to keep costs down while providing high-quality skylight installation.
Additionally, one representative will handle everything from the estimate to project completion.
Since the person in charge does not change, whether it’s the sales representative or the construction management representative, smooth communication is possible.
We can fully handle everything from the installation of temporary scaffolding to exterior painting, roofing work, and exterior cover work with our complete in-house construction!
Since skylight installation involves dismantling or removing roofing materials, it can significantly reduce costs when done simultaneously with roof replacement or cover work!
3. Various permits obtained and skilled workers on staff
We have obtained construction industry licenses and permits for industrial waste collection and transportation!
We have nationally certified sheet metal workers and painting technicians on staff, and we are confident in our construction techniques.
We are also capable of handling large-scale roofing projects such as those for factories!
We have qualified asbestos supervisors and asbestos inspectors on staff, allowing us to handle asbestos-containing roofing materials and conduct pre-investigations.
4. Warranty and Aftercare

The skylight replacement work comes with a warranty!
Aftercare is available every year, and we will send out a notification DM each year.
5. Flexible and Prompt Response
Our company is equipped to handle various troubles and situations related to skylights.
Even if you cannot access the roof at high places, we can respond using a drone!
During leak investigations, we can also conduct inspections using a thermal imaging camera, which helps in identifying the cause of leaks!
We will respond according to your wishes.
We also accept emergency measures for sudden leaks from skylights!
6. Human Resource Development
To improve our skills, we create various roof models and conduct practical training.
Since different sites require various processing techniques and skills, we regularly provide technical training to ensure all staff can respond effectively.
Possible subsidies and grants for skylight construction in Aoba-ku, Yokohama
In Aoba-ku, Yokohama, there are potential subsidies available when conducting skylight construction!
For details, please contact our company or your local government!
Kanagawa Prefecture Existing Housing Energy Conservation Renovation Subsidy
Eligible Persons
The eligible persons for this subsidy are owners of existing homes located in Kanagawa Prefecture who reside in those homes on a daily basis. The eligible homes must be residences where the owner themselves lives, regardless of whether they are single-family homes or apartments.
Eligible Construction and Conditions
To receive the subsidy, the following requirements must be met. First, the renovation must target existing homes in the prefecture and use products with insulation performance specified by the national government, such as windows, glass, and insulation materials. Additionally, the home must ensure seismic performance, and a preliminary application must be submitted before starting the construction, with construction commencing only after receiving a grant decision. Eligible construction includes insulation renovations for windows, floors, walls, and ceilings.
Subsidy Amount
The maximum amount for this subsidy is up to 200,000 yen per residence. This is the total subsidy provided when eligible energy conservation renovation work is carried out, and no more than this amount can be received.
Subsidy Rate
The burden ratio for the subsidy is **one-third (approximately 33%) of the eligible construction costs**. However, even if the calculated amount based on the subsidy rate exceeds the maximum limit of 200,000 yen, the amount granted will be capped at “the maximum amount”.
For more details, please check here!
Child-Rearing Green Housing Support Project
Eligible Persons
Households with children (households with children under 18) and young couples are the main targets for new construction or purchase of homes with high energy conservation performance, as well as energy conservation renovations of existing homes. For new constructions, the builder or purchaser is eligible, while for renovations, the contractor who orders the work is eligible for the subsidy.
Requirements
For new homes, it is necessary to meet high energy conservation performance standards set by the government, such as exceeding ZEH levels. For renovations, it is required to carry out work that improves the energy conservation performance of the home, such as insulation renovations or the introduction of energy-saving equipment. In both cases, it is necessary to contract with a registered business and complete the work within the specified period.
Subsidy Upper Limit
For new constructions, the maximum subsidy per unit is between 400,000 yen and 1,600,000 yen, depending on the performance classification of the house. For renovations, the maximum subsidy per unit is between 400,000 yen and 600,000 yen, depending on the content of the work. In both cases, even if multiple works are carried out, the total subsidy cannot exceed this upper limit.
Subsidy Rate
This program does not provide a subsidy based on a certain percentage of the construction cost; instead, a predetermined “fixed subsidy” is granted based on the content of the work and performance classification. Therefore, in effect, the government bears part of the construction cost.
For more details, please click here!
Advanced Window Renovation Project
Eligible Participants
Homeowners of existing houses (single-family homes and apartment buildings) who are conducting insulation renovation work on windows and openings are eligible. The actual subsidy application process is carried out by registered “window renovation contractors” with the government, and the granted subsidy is fully refunded to the homeowners through discounts on the construction costs.
Requirements
Eligible renovations include the installation of interior windows, replacement of exterior windows, and glass replacement aimed at improving insulation performance in existing homes. It is necessary to use products that meet the insulation performance standards set by the government and to enter into a construction contract with a registered window renovation contractor. Additionally, the total subsidy amount must be 50,000 yen or more, and the work must start and be completed within the specified construction period.
Subsidy Upper Limit
The upper limit for the subsidy is 2,000,000 yen per unit. Even if multiple windows are renovated, the total subsidy that can be received for the same house is limited to this upper limit.
Subsidy Rate
The subsidy rate is approximately equivalent to half of the construction costs. The actual subsidy amount is set at a fixed rate based on the type of window (interior window, exterior window, glass), size, and insulation performance classification, resulting in a total that is approximately 50% of the construction costs.
For more details, please click here!
Skylight Repair and Replacement Price List
This is the warranty and cost for each method of skylight repair!
| Renovation and Repair Methods | Warranty | Cost |
| Skylight Replacement / Cover (Using products from Velux Japan) |
Manufacturer Warranty Up to 20 Years | Approximately 250,000 yen~ (Varies by method) |
| Skylight Glass Replacement | Construction Warranty 3 Years~ (Varies by method) |
Approximately 60,000 yen~ (Varies by method) |
| Skylight Leak Repair (Sealing / Waterproof Tape) |
None | Approximately 10,000 yen~ (Varies by method) |
| Skylight Metal Replacement | Construction Warranty: 3 years and up (Varies by method) |
Approximately 60,000 yen and up (Varies by method) |
| Skylight Removal | Construction Warranty: 3 years and up (Varies by method) |
Approximately 60,000 yen and up (Varies by method) |
※Costs and warranty periods vary depending on the shape, quantity, condition of the base, whether it is related to roof overlay work or re-roofing work, type of existing roofing material, and type of materials used.
If you would like a detailed estimate, please feel free to contact us!
Estimates are completely free of charge.
For information on the costs of Kakeru Koumuten’s skylight repair and replacement plans, click here!
Customer Feedback
Advantages and Disadvantages of Skylights
Advantages of Skylights
High Light Transmission
First, the advantage of skylights is their high light transmission.
When natural light comes into the room, it creates a sense of openness, making it feel more pleasant.
Energy Savings
This also contributes to high light transmission, allowing you to save on electricity costs due to the presence of natural light. This reduces the need to turn on electric lights during the day, making it suitable for energy conservation.
Good Ventilation

By installing a skylight, you can open and close it, improving ventilation.
Warm air rises, enhancing airflow.
High Privacy
In areas with closely built houses, large windows can make the interior visible. However, with skylights, since they are installed on the roof, your privacy is maintained.
Disadvantages of Skylights
Risk of Leaks
The biggest concern when installing a skylight is the risk of leaks. Since it involves opening the roof for installation, there is always some risk of water leakage.
However, with proper installation and regular maintenance, the risk can be minimized significantly.
Regular Maintenance Required
Skylights need maintenance every 5 to 10 years to prevent leaks. While maintenance may seem bothersome, it is recommended to do it regularly to avoid damage to the interior and wooden parts caused by leaks.
Noise from Rain
Since skylights are installed directly on the roof, the sound of raindrops hitting the glass can easily be transmitted indoors, which is a disadvantage. This sound can be particularly noticeable during heavy rain or storms.
However, this is not the case for all skylights. Choosing double-glazed glass or products with high sound insulation can reduce the noise from rain.
Examples of Skylight Repair Work
| Construction Details |
| Skylight Replacement Work |
| New Materials Used |
| Japan Velux/FCM Fixed Type |
| Price Range |
| 400,000〜500,000 |
| Construction Period |
| 1 Day |
| Background to the Construction |
| Due to a broken skylight glass, we received a request for skylight replacement. Along with the skylight replacement, we also replaced the surrounding roofing materials. |
Skylight Replacement Work – Construction Procedure
1. Preparation
2. Skylight Demolition and Surrounding Roof Material Removal
3. Wooden Framework
4. Waterproof Sheet Installation Around the Skylight
This is an important task to prevent water leakage.
5. Metal Work Around the Skylight and New Roof Material Installation
If the skylight is not properly sealed, it can lead to a high risk of water leakage. Therefore, it is necessary to proceed with caution.
6. New Skylight Installation
By properly sealing against rain and performing regular maintenance, you can prevent leaks.
7. Cleaning
This will mark the completion of the project.
How to Choose a Skylight Contractor
There are many skylight contractors in Yokohama, and you may be unsure which one to choose.
Therefore, when requesting skylight replacement work or leak repairs, make sure to check the following 5 points:
● Have extensive experience in skylight work
● Confirm if they can also handle roofing work
● Check for warranties and aftercare services
● Obtain estimates from multiple contractors (at least 3 companies)
● Confirm if they perform roof renovations in-house
By checking the above 5 points, you will be able to choose a reliable contractor.
Have Extensive Experience in Skylight Work
Skylight contractors often have websites showcasing their work history.
Additionally, if they provide detailed explanations of repair work with photos, it can give you peace of mind as a reference when you request repairs.
If you are concerned about whether the contractor you are about to hire will respond adequately, choose one with rich repair experience.
It is also effective to refer to reviews on Google and review sites when looking for skylight contractors!
If there are many negative reviews or no reviews at all, it may be wise to refrain from hiring them.
Kakeru Koumuten Co., Ltd. specializes in exterior work, so we receive many requests for skylight replacement work.
Confirm if They Can Handle Roofing Work
Since skylights are installed on roofs, roofing work is often involved as well.
If a contractor lacks knowledge about roofs or cannot handle roofing work, it may lead to issues such as leaks after construction or high construction costs.
Moreover, since skylight replacement or removal may require partial dismantling of the roof and restoration, performing roof overlay work or re-roofing simultaneously can significantly reduce costs!
Our company specializes in roofing work, so we can propose the optimal plan tailored to your needs for roofing work associated with skylight installation.
Check for warranties and aftercare services
When choosing a skylight contractor, let’s confirm the availability of warranties.
If a leak occurs after the skylight installation, having a leak warranty from the contractor ensures that repairs can be done at no cost, providing peace of mind!
Additionally, a company that offers a warranty demonstrates confidence in their work, serving as a criterion for selecting a contractor!
Warranty periods vary by contractor and the nature of the work, but typically range from 1 to 10 years.
Emergency repairs or partial fixes often do not come with a leak warranty.
Moreover, some contractors offer aftercare services in addition to warranties, so be sure to check if the contractor you are considering has warranties andaftercare services.
Kakeru Koumuten Co., Ltd. sends out annual DM for aftercare maintenance, allowing for yearly inspections.
For simple repairs like partial sealing, we provide support at no charge.
Obtain estimates from multiple contractors (at least 3)
When requesting skylight work, obtain estimates from multiple contractors.
Even for the same repair or replacement work, costs and warranties or aftercare services may differ between contractors.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request your desired contractor at a lower price, it is essential to obtain estimates from multiple contractors.
When comparing estimates, consider not only the costs, but also
“Items in the estimate”
“Materials and quality of glass”
“Confirmation of processes”
and make a detailed comparison! If the quality of auxiliary materials is low or processes are skipped, costs can be reduced, so avoid making decisions based solely on price!
Confirm whether the work is done in-house
There are various construction methods for skylight repair plans, including full replacement, roof overlay (cover method), and partial repairs!
The plan details will vary depending on the actual state of deterioration and the customer’s preferences.
If you choose a contractor that completely outsources skylight repair work, they may lack knowledge and experience, leading to proposals for repairs in the wrong areas or unnecessary work. There are cases where customers who want to keep costs down are suggested costly projects like skylight replacement, even though partial repairs would suffice.
Additionally, since they investigate and then request subcontractors, both time and costs can increase unnecessarily.
By having knowledge and experience and performing the work in-house, we can provide responsible construction while keeping costs down.
Moreover, with contractors that outsource completely, one of the disadvantages is that response times during emergencies, such as post-construction troubles, can be delayed.
If you are looking for a skylight replacement contractor in Aoba-ku, Yokohama, please contact Kakeru Koumuten Co., Ltd.
Our company handles many roofing and exterior painting projects in Aoba-ku, Yokohama. We are happy to assist with skylight replacements, roof overlays, roof re-roofing, exterior painting, exterior cladding replacements, and partial roof repairs, as well as other repairs!
In urgent cases like leak repairs, we can also provide emergency measures without scaffolding, so please feel free to consult with us!
Whether you want to “make it last with a single renovation,” “keep costs as low as possible,” or “improve insulation performance because the indoors are hot,” we will provide the best solutions for your specific requests.
We carry out everything from temporary scaffolding work to roofing and exterior painting completely in-house.
We are confident that we excel in cost, quality, and organization compared to other companies in exterior work!
We welcome competitive estimates!
Exterior Renovation Service Areas
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.
Aoba-ku, Yokohama Area List
Aoba-ku, Yokohama, Ichizawa-cho / Aoba-ku, Yokohama, Imagawa-cho / Aoba-ku, Yokohama, Imajuku / Aoba-ku, Yokohama, Imajuku Higashimachi / Aoba-ku, Yokohama, Imajuku Nishimachi / Aoba-ku, Yokohama, Imajuku Minamimachi / Aoba-ku, Yokohama, Imajuku-cho / Aoba-ku, Yokohama, Oike-cho / Aoba-ku, Yokohama, Odaka-cho / Aoba-ku, Yokohama, Kashiwamachi / Aoba-ku, Yokohama, Kanagatani / Aoba-ku, Yokohama, Kamikawaicho / Aoba-ku, Yokohama, Kamishirane / Aoba-ku, Yokohama, Kamishirane-cho / Aoba-ku, Yokohama, Kawaijuku-cho / Aoba-ku, Yokohama, Kawaihonmachi / Aoba-ku, Yokohama, Kawashima-cho / Aoba-ku, Yokohama, Kirigasaku / Aoba-ku, Yokohama, Sakonyama / Aoba-ku, Yokohama, Sasanodai / Aoba-ku, Yokohama, Sachigaoka / Aoba-ku, Yokohama, Santanda-cho / Aoba-ku, Yokohama, Shikibidai / Aoba-ku, Yokohama, Shimokawaicho / Aoba-ku, Yokohama, Shirane / Aoba-ku, Yokohama, Shirane-cho / Aoba-ku, Yokohama, Zenbu-cho / Aoba-ku, Yokohama, Toyoka-cho / Aoba-ku, Yokohama, Tsurugamine / Aoba-ku, Yokohama, Tsurugamine Honmachi / Aoba-ku, Yokohama, Nakao / Aoba-ku, Yokohama, Nakakibogaoka / Aoba-ku, Yokohama, Nakazawa / Aoba-ku, Yokohama, Nakashirane / Aoba-ku, Yokohama, Nishikawajima-cho / Aoba-ku, Yokohama, Higashikibogaoka / Aoba-ku, Yokohama, Futamatagawa / Aoba-ku, Yokohama, Honjuku-cho / Aoba-ku, Yokohama, Honmura-cho / Aoba-ku, Yokohama, Mankigahara / Aoba-ku, Yokohama, Minami Kibogaoka / Aoba-ku, Yokohama, Minami Honjuku-cho / Aoba-ku, Yokohama, Yashiro-cho / Aoba-ku, Yokohama, Wakabadai
・Trust Kakeru Koumuten Co., Ltd. for exterior wall painting in Aoba-ku, Yokohama!
・Trust Kakeru Koumuten Co., Ltd. for roof renovations in Aoba-ku, Yokohama!
・Trust Kakeru Koumuten Co., Ltd. for exterior renovations in Aoba-ku, Yokohama!
・Kakeru Koumuten Co., Ltd. project achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. service menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・We explain the importance of getting multiple estimates and points to compare!
・Trust Kakeru Koumuten Co., Ltd. for leak repairs in Aoba-ku, Yokohama!
We welcome inquiries via LINE◎
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!





