Leave your waterproofing work in Kamakura City, Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!
If you are looking for a waterproofing contractor in Kamakura City
please contact Kakeru Koumuten
Kakeru Koumuten is a company specializing in exterior renovations in Kanagawa Prefecture.
We receive many requests for waterproofing work in Kamakura City, from single-family homes to apartment buildings.
“Reasons why Kakeru Koumuten is chosen in Kamakura City”
“About the costs of waterproofing work”
“How to choose a waterproofing contractor”
“Subsidies and grants available for waterproofing work in Kamakura City”
We will explain the above four points!
For customers considering waterproofing work in Kamakura City, this will definitely be helpful,
so please take a look!
Reasons why Kakeru Koumuten is chosen for waterproofing work in Kamakura City
The reasons why our company is entrusted with waterproofing work by customers in Kamakura City include
one reason being that we have a base in Kanagawa Prefecture, but also
“our strengths in waterproofing work that cannot be imitated by other companies”
which have received high praise from many customers.
“Cost,” “Quality,” “Plan” are our absolute strengths,
and we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome competitive estimates!
1.Equipment specialized in exterior renovations
At Kakeru Koumuten Co., Ltd., we have organized the following warehouses and material storage areas to provide more affordable and faster exterior renovations such as waterproofing work.
We have established 5 bases centered around Aoba-ku, Yokohama for material storage and showrooms.
In-house Scaffolding Materials


We own the scaffolding materials necessary for temporary scaffolding required for waterproofing work, allowing us to assemble temporary scaffolding in-house.
By not outsourcing scaffolding work and using our own scaffolding team, we can also cut costs on scaffolding construction.
Since everything is done in-house, we can significantly reduce costs by shortening the construction period!
We have approximately enough scaffolding materials for 50 single-family homes!
Material Storage in Our Large In-house Warehouse

We store roofing materials and waterproofing components.
By ordering a large quantity of materials at once, we canprocure materials at a lower cost!
Additionally, we always have waterproofing components in stock, allowing us torespond quickly to emergency waterproofing work!
In-house waste separation
In waterproofing work, various waste materials are generated.
Most contractors dispose of them all together, but by sorting and recycling waste materials, significant cost reductions on waste disposal can be achieved.
Exterior Renovation Dedicated Showroom


In our showroom, not only can you have meetings, but you can also
directly check the actual structure and colors.
2.Complete In-House Construction
One of Kakeru Koumuten’s major strengths is complete in-house construction.
From inquiry to project completion, everything is handled by Kakeru Koumuten Co., Ltd., allowing us to keep costs down while providing high-quality waterproofing work.
Additionally, one representative will assist you from the estimate to the completion of the work.
Since the same person will handle sales and construction management, smooth communication is possible.
We are confident in our construction plans and costs, so we welcome competitive estimates!
3. Various Permits and Skilled Workers

We have obtained construction industry permits and permits for industrial waste collection and transportation!
We also have nationally certified professionals on staff, and we are confident in our construction techniques.
We are capable of handling large-scale waterproofing projects such as those for factories!
4. Warranty and Aftercare
Waterproofing work comes with a guarantee!
Depending on the type of waterproofing work, we provide a 5 to 10-year leak warranty.
If you have any questions about the warranty, please click on the image above!
In the unlikely event that leaks are not resolved after the waterproofing work, we will take full responsibility and address the issue!
Additionally, aftercare maintenance is available every year, and we will send you a DM notification for aftercare maintenance once a year.
During aftercare maintenance, we will check the entire waterproofing system and assess the condition of any deterioration.
5. Flexible and Prompt Response
Our company is equipped to handle various troubles and situations.
If we cannot access the rooftop for waterproofing checks, we will utilize drones to assess the condition.
We can also conduct investigations using thermal imaging cameras during leak investigations.
We will respond according to your wishes.
We also accept emergency measures for sudden leaks!
Since our sales and construction management are not separated, one dedicated representative will handle everything from the estimate to the completion of the work!
Changing representatives frequently can lead to miscommunication regarding the details and precautions of the work, which could cause problems, so we maintain a system where the representative remains the same.
6. Human Resource Development
We create various building models to enhance our skills and conduct practical training.
To ensure that each staff member can handle various buildings, we regularly provide technical training.
Subsidies and Grants for Waterproofing Work in Kamakura City
If damage caused by natural disasters is recognized, it may be covered by fire insurance.
For waterproofing, potential damage from natural disasters may include “holes in waterproof sheets caused by flying objects or falling debris due to wind damage.”
If you are unsure whether it is covered by fire insurance, please feel free to contact us!
Reduction of Property Tax Associated with Large-Scale Renovation Work for Extending the Lifespan of Condominiums
To promote the longevity of condominiums, if large-scale renovation work that contributes to longevity is completed within a certain period and reported within three months of completion, the property tax for the following year related to the completed work will be reduced.
Reduction of Property Tax Associated with Large-Scale Renovation Work for Extending the Lifespan of Condominiums
Kamakura City Official Website
About the Costs of Waterproofing Work
⇧ Construction Menu | For Information on Waterproofing Costs, Click Here
Waterproofing Work Case Studies
| Construction Details |
| Urethane waterproofing ventilation buffer method / High-strength urethane type Existing waterproofing: PVC sheet waterproofing |
| Materials Used |
| Waterproofing: AGC polymer building materials / Saracene A (high-strength urethane) Ventilation sheet: QV sheet Vent pipe: Stainless steel Replaced with renovation drain |
| Price Range |
| 700,000 to 800,000 yen |
| Construction Period |
| Approximately 2 weeks |
| Completion Month |
| May 2024 |
| Inquiry Details |
| We have received the following inquiries from our customer: ・There are wrinkles and bulges in the waterproof sheet on the rooftop, so we are worried about leaks. ・We would like an estimate for a complete waterproof renovation, not just partial repairs or a top coat. ・We learned that urethane waterproofing has high waterproofing properties, so we would like an estimate for urethane waterproofing. ・Since this is our first waterproofing project, we would like to compare estimates. |
Our Proposal
Since you expressed a desire to renovate using a long-lasting method rather than protective agents like top coats, we proposed a complete “urethane waterproofing project” for the rooftop.
If urethane waterproofing is applied using a bonding method, air rising from the building can cause bulges in the waterproof layer, so we proposed the “urethane waterproofing ventilation buffer method.”
The ventilation buffer method involves applying a ventilation buffer sheet over the entire area before applying urethane waterproofing.
By applying the ventilation buffer sheet first, air rising from the building is suppressed by the ventilation sheet and expelled through the “ventilation pipe.”
This can prevent the most common trouble with waterproofing, which is bulging of the waterproof layer!
After explaining the materials and methods, you entrusted the project to us among the four estimates!
Timing for Waterproofing Work
Leaks Have Already Occurred
If leaks have already occurred, it is necessary to address the issue promptly before the damage spreads.
If left unattended, it can adversely affect the interior and underlying structures, so it is essential to stop the leaks quickly.
Bulging or Cracking of the Waterproof Layer
If the waterproof area is cracked, it can lead to rainwater intrusion.
If the waterproof layer is bulging, it indicates that moisture is accumulating within the layer.
Bulging can lead to cracks, which can result in leaks, so early detection and action are necessary.
Moss or Mold Growth
Moss or mold can develop due to accumulated moisture or rainwater.
This can be caused by poor drainage or sinking of the waterproof layer due to aging.
Exceeding the Durability Period
Generally, the durability period for waterproofing work is 10 to 20 years.
Of course, the durability period can vary depending on the construction method and materials, but for some types of waterproofing, it is recommended to apply only the surface protective agent (top coat) approximately every 8 years (such as urethane waterproofing or FRP waterproofing).
We recommend conducting regular inspections starting from 5 years after construction.
Understanding the types of waterproofing and performing appropriate maintenance is essential.
If you are unsure about the type of waterproofing, please send us a photo via email or LINE, and we will help you determine it!
Types of Waterproofing Work
1. Urethane Waterproofing
Urethane waterproofing is a method that involves applying liquid polyurethane resin to the waterproofing surface.
Before curing, it is in liquid form, which allows it to be applied to complex shapes and, unlike sheet waterproofing, it can be installed without seams.
It can be widely applied to balconies and rooftops.
For more details on the advantages, disadvantages, and maintenance methods of urethane waterproofing, please refer to the article below.
For more on waterproofing work | Urethane waterproofing, click here!
2. Rubber Sheet Waterproofing
Rubber sheet waterproofing involves adhering synthetic rubber sheets to the surface to prevent water intrusion.
This type of waterproofing is commonly used on large areas such as rooftops.
Compared to urethane waterproofing, it has the advantage of faster installation since there is no waiting for drying, but it is not suitable for complex surfaces.
For more details on the advantages, disadvantages, and maintenance methods of rubber sheet waterproofing, please refer to the article below.
For more on waterproofing work | Rubber sheet waterproofing, click here!
3. PVC Sheet Waterproofing
PVC sheet waterproofing is a waterproof sheet made of polyvinyl chloride, and like rubber sheet waterproofing, it is applied to the surface to prevent water intrusion.
Similar to rubber sheets, it is not suitable for complex shapes. Although the cost is higher than rubber sheets and urethane waterproofing, its long durability is a significant advantage.
For more detailed information about the advantages, disadvantages, and maintenance methods of PVC sheet waterproofing, please refer to the article below.
For waterproofing work | Click here for information on PVC sheet waterproofing!
4. Long Sheet Waterproofing
Long sheet waterproofing, officially known as “slip-resistant vinyl floor sheet,” is commonly applied in shared areas and staircases of apartments where people walk.
As the name suggests, it is slip-resistant and has high durability and abrasion resistance, making it suitable for walking areas.
Additionally, it comes in various designs, excelling in aesthetic appeal.
However, it tends to be more expensive, and since it does not overlap seams like rubber sheets or PVC sheets, it may give a slightly lower impression of waterproofing performance.
It is rarely used in areas like rooftops of apartments where people do not frequently enter and exit.
For more detailed information about the advantages, disadvantages, and maintenance methods of long sheet waterproofing, please refer to the article below.
For waterproofing work | Click here for information on long sheet waterproofing!
5. FRP Waterproofing
FRP waterproofing involves creating a waterproof layer by solidifying glass mat with epoxy resin to prevent rainwater intrusion.
It is commonly applied on single-family home balconies, with an overwhelmingly short construction period, often completed in as little as one day.
Due to its lightweight and low cost, it is estimated that about 80% of single-family home balconies use FRP waterproofing.
However, it is not suitable for installation on large surface areas, making it less appropriate for rooftop applications.
For more detailed information about the advantages, disadvantages, and maintenance methods of FRP waterproofing, please refer to the article below.
Waterproofing Work | Click here for FRP Waterproofing!
6. Asphalt Waterproofing
Asphalt waterproofing refers to a waterproof sheet that has asphalt permeated into synthetic fiber non-woven fabric.
The waterproofing shown in the photo is a method where asphalt waterproofing is secured with cinder concrete.
This waterproofing is used in buildings with large areas such as rooftops of schools and commercial facilities.
There are various methods of asphalt waterproofing, each with its own advantages and disadvantages, but a significant advantage is its high durability.
For more details on the advantages, disadvantages, and maintenance methods of asphalt waterproofing, please refer to the article below.
Waterproofing Work | Click here for Asphalt Waterproofing!
How to Choose a Waterproofing Contractor
There are many waterproofing contractors available in Kamakura City.
Among the numerous contractors, there are likely many who feel “I don’t know who to ask…”.
Choosing the right contractor can be challenging at first, so I will explain 5 points to consider when requesting waterproofing work.
● Have extensive experience in waterproofing work
● Confirm the presence of aftercare and warranty
● Obtain multiple estimates for waterproofing work (at least 3 companies)
● Check if they perform waterproofing work in-house
● Carefully review the contents, processes, and materials used in the waterproofing estimate
By confirming the above 5 points, you will be able to choose a reliable contractor.
Check if they have extensive experience in waterproofing work
About 10-20% of waterproofing work troubles are caused by construction defects during the installation.
To prevent troubles, it is important to hire a reliable contractor with experience!
You need to refer to the contractor’s website for their construction achievements and reviews to make a judgment.
Some contractors showcase their achievements on social media platforms like Instagram, so checking those can also be effective!
It is also effective to look at waterproofing companies on review sites for reference!
A particularly recommended review site is “Google”.
Since contractors cannot arbitrarily delete low ratings, it is a trustworthy source of reviews.
If there are many negative reviews or no reviews at all, it may be wise to refrain from making a request.
Check if there is aftercare maintenance and construction warranty
In case any construction defects or issues occur after the work is done, let’s confirm if they provide a “construction warranty”!
Contractors who offer warranties tend to have confidence in their work, making them more trustworthy companies!
If waterproofing work is done, make sure to have photos taken of hidden areas during the process for confirmation!
Check for leaks during rainy weather after the waterproofing work, and if there are any issues, contact the contractor immediately as it will facilitate smooth communication shortly after the work is completed!
Also, to ensure early detection of any issues that may arise, confirm if they conduct thorough aftercare maintenance!
Since non-specialized contractors may not notice signs of problems or troubles, having specialized contractors perform regular aftercare maintenance can help prevent issues before they occur!
Our company sends out aftercare maintenance DM every year, so if you wish, annual aftercare maintenance is possible!
Obtain estimates from multiple contractors (at least 3)
When requesting waterproofing work, be sure to obtain estimates from multiple contractors.
We recommend obtaining estimates from at least 3 companies.
The costs may vary between contractors even for the same waterproofing work, and the warranties and after-services may differ as well.
Additionally, obtaining multiple estimates makes it easier to negotiate prices. To request at the lowest possible cost, obtaining estimates from several contractors is essential.
When comparing estimates, be sure to check not only the costs but also the “types of materials used” and “construction methods” in detail!
Check if they perform waterproofing work in-house
Confirm whether they perform waterproofing work in-house!
If a sales company investigates and then requests a subcontractor, it will incur additional time and costs.
Moreover, there may be cases where customer requests are not 100% conveyed to the subcontractor, leading to troubles.
By having one company handle everything from sales to construction, responsible waterproofing work can be done quickly and cost-effectively. Kakeru Koumuten conducts everything from on-site surveys to actual construction in-house!
Furthermore, in the unlikely event of leaks or troubles, a company that employs its own craftsmen can respond to and resolve issues quickly!
Carefully Check the Details of the Waterproofing Estimate, Process, and Materials
Even for the same waterproofing work, there are various types such as “method,” “materials,” and “process,” and it is necessary to carry out the work using the most suitable method and materials depending on the construction site and existing substrate.
For example, even with the same urethane waterproofing, there are different processes such as “adhesion method” and “ventilated buffer method,” and there are various types of urethane waterproofing materials, including “high-strength specifications,” “heat-insulating specifications,” and “anti-slip specifications.” Therefore, it is essential to confirm whether the construction content is appropriate for the location!
It is important not to judge solely by cost, but to carefully check whether “the method is suitable for the base material?” and “are the materials appropriate?”
So, if the materials used are only “urethane waterproofing materials,” let’s confirm the product name and check what kind of materials they are!
If You Are Looking for a Waterproofing Contractor in Kamakura City, Please Contact Kakeru Koumuten Co., Ltd.
Our company has handled many waterproofing projects in Kamakura City.
Our greatest strength is that we can carry out everything from proposals to temporary scaffolding installation and waterproofing work in-house!
Kakeru Koumuten promises “high-quality waterproofing work at low cost”, and we have received high praise from many customers.
We continue to update our construction performance every year, and we will strive to improve quality to satisfy even more customers in the future.
We are also happy to handle small partial works!
In addition to waterproofing work, we can carry out roofing work, exterior painting, and exterior cover methods, all in-house.
We are confident that we will not be outdone by other companies in terms of cost, quality, and organization for exterior work!
We welcome competitive estimates with confidence!
Estimates are completely free, and if our company is inferior to others, you are welcome to decline!
For exterior renovations in Kamakura City, click here!
For exterior painting in Kamakura City, click here!
For roofing renovations in Kamakura City, click here!
For leak repairs in Kamakura City, click here!
Features of Kamakura City
Kamakura City in Kanagawa Prefecture is an attractive city where historical heritage and rich nature harmonize. The city is filled with temples and shrines that evoke the atmosphere of an ancient capital, along with traditional streets, captivating many tourists with its seasonal natural beauty.
Kamakura City belongs to a warm maritime climate, characterized by relatively mild weather throughout the year. Summers are hot and humid, while winters are relatively warm with rare snowfall. The annual precipitation is average, with significant rainfall during the rainy season. The city’s geography, surrounded by the sea and mountains, allows residents to experience the natural changes of each season up close.
Kamakura City is also known for its excellent access from the metropolitan area. The JR Yokosuka Line and Enoshima Electric Railway (Enoden) are the main modes of transportation. Kamakura Station on the JR Yokosuka Line is about a one-hour direct ride from Tokyo Station and approximately 30 minutes from Yokohama Station. The Enoden connects Fujisawa Station to Kamakura Station, offering scenic views of the Shonan coastline and is a popular route among tourists.
Access by car is also convenient, with smooth travel from the city center and neighboring cities via the Yokohama-Yokosuka Road and Shonan Road. However, during tourist seasons and weekends, the roads can become congested, so public transportation is sometimes recommended.
Kamakura City is dotted with numerous historical and cultural landmarks. Notable spots include “Kōtoku-in,” known for the Great Buddha of Kamakura, “Hase-dera,” famous for its beautiful seasonal flowers, and “Tsurugaoka Hachimangu.” The coastlines at Yuigahama and Inamuragasaki are bustling with people enjoying marine sports and beach activities, all while surrounded by stunning scenery.
Kamakura City is a unique city that blends history and nature, offering a variety of experiences for visitors.
Kakeru Koumuten Co., Ltd. provides exterior construction services in Kamakura City. We offer a wide range of services including waterproofing, roof replacement, roof overlay (cover method), exterior wall painting, and roof painting.
Please feel free to consult us if you have any concerns!
Waterproofing Service Areas
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and all of Tokyo.
Kamakura City Area List
Kamakura City Inamuragasaki / Kamakura City Imaizumi / Kamakura City Imaizumidai / Kamakura City Iwase / Kamakura City Ueki / Kamakura City Ougigaya / Kamakura City Ofuna / Kamakura City Omachi / Kamakura City Okamoto / Kamakura City Onarimachi / Kamakura City Kajiwara / Kamakura City Kamakurayama / Kamakura City Kamiyachō / Kamakura City Koshigoe / Kamakura City Kobukurodani / Kamakura City Komachi / Kamakura City Gokurakuji / Kamakura City Sakanoshita / Kamakura City Sasame / Kamakura City Sasukezaka / Kamakura City Zaimokuzaka / Kamakura City Shichirigahama / Kamakura City Shichirigahama Higashi / Kamakura City Jōmae / Kamakura City Junishō / Kamakura City Jōmyōji / Kamakura City Sekiya / Kamakura City Takano / Kamakura City Tamagawa / Kamakura City Dai / Kamakura City Tsū / Kamakura City Tsū Nishi / Kamakura City Tehiro / Kamakura City Terabun / Kamakura City Tokiwadai / Kamakura City Nikaidō / Kamakura City Nishikamakura / Kamakura City Nishimigata / Kamakura City Hase / Kamakura City Fueda / Kamakura City Yamazaki / Kamakura City Yamanouchi / Kamakura City Yuigahama / Kamakura City Yukinoshita
Consultations via LINE are also welcome◎
株式会社翔工務店へ
株式会社翔工務店は平均年齢20代後半の若い会社ですが、技術はどこにも負けていません。
いちばんの強みは、足場工事、屋根工事、塗装工事とすべて自社で行えること。一般には分業されるこの業界にあって、一式で頼めるので管理に手間がかからず、コストも抑えることが出来ます。何より、トラブルがあればすぐにかけつけます!
自信をもって、宣言できます。私たちは、神奈川で一番若くて親切なリフォーム屋です!





