If you are looking for a roof repair contractor in Ota-ku, Tokyo, come to Kakeru Koumuten
Kakeru Koumuten is an exterior renovation company specializing in roof repairs and leak repairs.
We have handled numerous roof and leak repairs in Ota-ku, Tokyo.
If you are considering a roof renovation, please consult with Kakeru Koumuten!
We respond widely to sudden leaks that occurred after a typhoon, and roof repairs according to the age of the building, among other services.
For those in Ota-ku, Tokyo, we can respond as soon as the same day, so please feel free to contact us.
How to Choose a Leak Repair Contractor
There are many leak repair contractors in Ota-ku, and it can be confusing to choose the right one.
Therefore, when requesting roof repairs and leak repairs, let’s check the following four points.
● Have extensive experience in roof repairs and leak repairs
● Confirm the presence of warranties and aftercare services
● Obtain estimates from multiple contractors (at least three)
● Check if they conduct leak investigations and roof repairs in-house
By confirming the above four points, you will be able to choose a reliable contractor.
Extensive Experience in Roof Repairs and Leak Repairs
Roof repair contractors often have websites that showcase their construction achievements.
The construction results may explain the following items, so let’s check if similar repairs have been done for your home.
Repair details,the process leading up to the repair,materials used,repair costs,repair duration, etc.
Additionally, having detailed explanations of the repair work with photos can provide peace of mind as it serves as a reference when you request repairs.
If you are concerned about whether the contractor you are about to hire will respond properly, choose a contractor with extensive repair experience.
Kakeru Koumuten Co., Ltd. specializes in roof and exterior repairs, and we receive many requests for rain leak repairs.
Examples of rain leak repairs by Kakeru Koumuten Co., Ltd. in Ota-ku

Our Proposal
The existing roofing material is “Colonial NEO,” which cannot be painted.
Due to numerous cracks and missing roofing materials, the only effective roof renovation method was the overlay method.
Since the customer requested to keep costs down while using the overlay method, we proposed the Nichiha/Alma overlay method.
We suggested roofing sheets and purlins that match the durability of the roofing materials!
Check for Warranty and Aftercare Services
When choosing a leak repair contractor, make sure to check for warranties.
Leak repairs can recur even after being fixed once, so if you have to request repairs every time a leak reoccurs, it can lead to significant expenses.
For this reason, if you choose a contractor that offers a warranty period, there may be cases where repairs can be done for free within that warranty period.
The warranty period varies depending on the contractor and the type of work, but it is generally set between 1 to 10 years.
Emergency measures or partial repairs often do not come with a leak warranty.
Additionally, some contractors offer after-sales services separate from warranties, so it’s important to check whether the contractor you are considering has warranties and after-sales services.
Kakeru Koumuten Co., Ltd. provides a leak warranty for all roof overlay and roof replacement work.
Similarly, for exterior walls, a leak warranty is included for exterior wall overlay and replacement work, as well as for joint sealing work.
As part of our aftercare maintenance, we send out annual direct mail, allowing for yearly inspections.
Obtain estimates from multiple contractors (at least 3 companies)
When requesting roof renovations or leak repairs, be sure to get estimates from multiple contractors.
Even for the same repair work, the costs may vary between contractors, as well as the warranties and after-sales services offered.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request your preferred repair contractor at the best possible price, obtaining estimates from multiple contractors is essential.
If a leak occurs, it’s natural to feel rushed, but
first, perform emergency measures, and if you decide to proceed with repairs, taking your time to consider will lead to a satisfactory outcome!
Kakeru Koumuten Co., Ltd. is happy to assist with emergency leak measures!
Check if the company conducts leak investigations and roof repairs in-house
Leaks can sometimes be easily identified, while in other cases, it may take time to pinpoint the source of the leak, requiring knowledge and experience.
Contractors that completely outsource roof repairs and leak repairs to subcontractors may lack the necessary knowledge and experience, leading to repairs in the wrong areas or suggesting ineffective leak repairs.
Moreover, having to investigate and then rely on subcontractors can result in additional time and costs.
By having the knowledge and experience to perform the work in-house, we can provide prompt and cost-effective responsible leak repairs.
Kakeru Koumuten Co., Ltd. conducts leak investigations and construction in-house!
About the costs of leak repair work
The table below shows the average repair costs for areas prone to leaks.
|
Repair Details |
Average Cost |
|
Partial replacement of roofing materials |
¥10,000 – ¥20,000 |
|
Roof replacement (re-roofing) |
From ¥500,000 |
|
Roof overlay (cover method) |
From ¥400,000 |
|
Replacement and repair of ridge metal |
From ¥10,000 |
|
Skylight repair |
From ¥10,000 |
|
Repair of exterior walls and joints |
From ¥10,000 |
|
Repair of cap metal |
From ¥10,000 |
|
Waterproofing work for balconies and rooftops |
From ¥80,000 |
For detailed pricing, click here!!
About Kakeru Koumuten
Kakeru Koumuten Co., Ltd. is a remodeling company based in Aoba-ku, Yokohama, Kanagawa Prefecture, specializing in roofing, painting, and scaffolding work with complete in-house construction.
Since we assemble our own temporary scaffolding and can perform roof repairs,
we can provide quick leak repairs at a reduced cost.
Company Introduction


● We store scaffolding materials!
Since we can set up temporary scaffolding in-house, we can perform roof repairs quickly.


● We store materials and tools related to roofing and painting work!
We have all the necessary components for leak repairs, allowing us to respond quickly!
Customer Reviews
Service Areas
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.
Contact page for Kakeru Koumuten Co., Ltd. is here!
List of Areas in Ota-ku
Aoba-ku, Yokohama, Ikegami / Aoba-ku, Yokohama, Ishikawacho / Aoba-ku, Yokohama, Unoki / Aoba-ku, Yokohama, Omori Naka / Aoba-ku, Yokohama, Omori Honcho / Aoba-ku, Yokohama, Omori Higashi / Aoba-ku, Yokohama, Omori Nishi / Aoba-ku, Yokohama, Omori Minami / Aoba-ku, Yokohama, Omori Kita / Aoba-ku, Yokohama, Kamata / Aoba-ku, Yokohama, Kamata Honcho / Aoba-ku, Yokohama, Kami Ikedai / Aoba-ku, Yokohama, Kita Kojiya / Aoba-ku, Yokohama, Kita Chitoku / Aoba-ku, Yokohama, Kita Magome / Aoba-ku, Yokohama, Kita Reimachi / Aoba-ku, Yokohama, Kugahara / Aoba-ku, Yokohama, Kyobashi Island / Aoba-ku, Yokohama, Sanno / Aoba-ku, Yokohama, Shimo Maruko / Aoba-ku, Yokohama, Jonan Island / Aoba-ku, Yokohama, Showa Island / Aoba-ku, Yokohama, Shin Kamata / Aoba-ku, Yokohama, Tamagawa / Aoba-ku, Yokohama, Chidori / Aoba-ku, Yokohama, Chuo / Aoba-ku, Yokohama, Den’enchofu / Aoba-ku, Yokohama, Den’enchofu Honcho / Aoba-ku, Yokohama, Den’enchofu Minami / Aoba-ku, Yokohama, Tokai / Aoba-ku, Yokohama, Naka Ikegami / Aoba-ku, Yokohama, Naka Magome / Aoba-ku, Yokohama, Naka Rokugo / Aoba-ku, Yokohama, Nishi Kamata / Aoba-ku, Yokohama, Nishi Kojiya / Aoba-ku, Yokohama, Nishi Magome / Aoba-ku, Yokohama, Nishi Reimachi / Aoba-ku, Yokohama, Nishi Rokugo / Aoba-ku, Yokohama, Haginaka / Aoba-ku, Yokohama, Haneda / Aoba-ku, Yokohama, Haneda Asahi-cho / Aoba-ku, Yokohama, Haneda Airport / Aoba-ku, Yokohama, Higashi Kamata / Aoba-ku, Yokohama, Higashi Kojiya / Aoba-ku, Yokohama, Higashi Magome / Aoba-ku, Yokohama, Higashi Reimachi / Aoba-ku, Yokohama, Higashi Yaguchi / Aoba-ku, Yokohama, Higashi Yukigaya / Aoba-ku, Yokohama, Higashi Rokugo / Aoba-ku, Yokohama, Furusato no Hamabe Park / Aoba-ku, Yokohama, Heiwajima / Aoba-ku, Yokohama, Heiwa no Mori Park / Aoba-ku, Yokohama, Hon Haneda / Aoba-ku, Yokohama, Minami Kamata / Aoba-ku, Yokohama, Minami Kugahara / Aoba-ku, Yokohama, Minami Chitoku / Aoba-ku, Yokohama, Minami Magome / Aoba-ku, Yokohama, Minami Yukigaya / Aoba-ku, Yokohama, Minami Rokugo / Aoba-ku, Yokohama, Yaguchi / Aoba-ku, Yokohama, Yukigaya Otsuka-cho
Subsidies and Grants for Leak Repairs in Ota-ku, Tokyo
In Ota-ku, Tokyo, the following subsidies may be available for leak repairs. For details, please contact our company or your local government. (As of February 2025)
Subsidy Program for Seismic Diagnosis, Renovation, and Demolition of Wooden Houses
About this Subsidy Program
Buildings constructed before the revision of seismic standards due to the Building Standards Act in June 1981 (Showa 56) are known as “old seismic” buildings and are likely to lack strength against seismic shaking.
To prevent the collapse of these buildings that are deficient in seismic resistance due to earthquakes, Ota-ku provides partial subsidies for free simple diagnosis, seismic diagnosis, renovation work, and demolition work costs.
Subsidy Amount
| Seismic Retrofit Construction Subsidy Amount | |||
| Subsidy Limit Amount |
Subsidy Ratio | ||
| When the front road is 4m or more | 1,500,000 yen |
2/3 of the required cost | |
| When the front road has already been widened |
|||
| When widening the road due to being less than 4m |
|||
| When less than 4m but not widening the road (no protrusion) | 750,000 yen | 1/3 of the required cost | |
| When less than 4m but not widening the road (with protrusion) | No subsidy | ||
| Not connected to the road | |||
For the required costs, the smaller of the actual seismic retrofit construction costs and the calculated cost based on total area × unit price (34,100 yen/square meter) will be applied, whichever is smaller.
Summary
Our company handles many roofing projects in Ota-ku.
We are happy to assist with roof overlay work, roof replacement, leak repairs, and other partial roof repairs!
“I just need a temporary fix for the leak”
“I want to repair my broken roof”
“I want to implement overall leak prevention measures for the building”
We will provide the best solutions for your specific requests.
Estimates and inspections are, of course, free!
From temporary scaffolding work to roofing and exterior painting, we carry out everything with our own team.
We are confident that our costs, quality, and efficiency in exterior work surpass those of other companies!
We welcome competitive estimates!
We look forward to your inquiries. Thank you very much.
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!




