Leave Your Waterproofing Work in Fujisawa City, Kanagawa to Kakeru Koumuten Co., Ltd.!
If you are looking for a waterproofing contractor in Fujisawa City
Contact Kakeru Koumuten
Kakeru Koumuten is a specialized exterior renovation company located in Kanagawa Prefecture.
We receive many requests for waterproofing work in Fujisawa City, ranging from single-family homes to apartment buildings.
“Reasons why Kakeru Koumuten is chosen in Fujisawa City”
“About the costs of waterproofing work”
“How to choose a waterproofing contractor”
“Subsidies and grants available for waterproofing work in Fujisawa City”
We will explain the above four points!
This will definitely be helpful for customers considering waterproofing work in Fujisawa City, so please take a look!
Reasons why Kakeru Koumuten is chosen for waterproofing work in Fujisawa City
One reason we are entrusted with waterproofing work by customers in Fujisawa City is that
we have a base within Kanagawa Prefecture,
“Our strengths in waterproofing work that cannot be imitated by other companies”
which has received high praise from many customers.
we have absolute confidence in “cost,” “quality,” and “plans”, so
we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome competitive estimates!
1.Specialized equipment for 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 five bases centered around Aoba-ku, Yokohama for material storage and showrooms.
In-house Ownership of Scaffolding Materials


We own the scaffolding materials necessary for temporary scaffolding required for waterproofing work, allowing us to assemble temporary scaffolding in-house.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs associated with scaffolding work.
Since everything is done in-house, we can significantly reduce costs through shortened construction periods!
We have enough scaffolding materials for approximately 50 single-family homes!
Storage of Materials in Our Large In-house Warehouse

We store roofing materials and waterproofing components.
By ordering a large quantity of materials at once, we can purchase materials at a lower cost!
Additionally, we always have waterproofing components in stock, allowing us to respond quickly to emergency waterproofing work!
In-house sorting of waste materials
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 in waste disposal can be achieved.
Exterior Renovation Dedicated Showroom


In our showroom, not only can you have meetings, but you can also
directly confirm the actual structure and color.
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. This allows 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 project.
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 permits for construction work and industrial waste collection and transportation!
We also have qualified personnel 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 guarantee.
If you have any questions about the guarantee, please click on the image above!
In the unlikely event that leaks are not resolved after the waterproofing work, we will take responsibility and respond accordingly!
Additionally, aftercare maintenance is available annually, and we will send you a DM reminder for aftercare maintenance each 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.
During leak investigations, we can also conduct surveys using thermal imaging cameras.
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 have established a system to keep the same representative throughout the process.
6. Human Resource Development
We are creating various building models to enhance our skills and conducting practical training.
To ensure that each staff member can handle various buildings, we regularly conduct skill enhancement training.
Subsidies and Grants That May Apply to Waterproofing Work in Fujisawa City
If damage caused by natural disasters is recognized, it may be covered by fire insurance.
Considerations for waterproofing damage due to natural disasters may include “holes in waterproof sheets caused by flying objects or falling debris due to wind damage.”
If you are unsure whether your fire insurance applies, please feel free to contact us!
Property Tax Reduction Measures for Condominiums That Have Undergone Large-Scale Renovation Work Contributing to Longevity
Starting from the 5th year of Reiwa, for condominiums that meet certain criteria, property tax for the year following the completion of large-scale renovation work contributing to longevity will be reduced, provided that the work is completed and a declaration is made within three months of completion.
Property Tax Reduction Measures for Condominiums That Have Undergone Large-Scale Renovation Work Contributing to Longevity
Fujisawa City Official Website
About the Costs of Waterproofing Work
⇧ Construction Menu | For Information on Waterproofing Costs, Click Here
Waterproofing Construction 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 roof, so we are worried about leaks. ・Please provide an estimate for a complete waterproof renovation, not just partial repairs or a top coat. ・I learned that urethane waterproofing has high waterproofing properties, so I would like an estimate for urethane waterproofing. ・Since this is my first waterproofing project, I would like to compare estimates. |
Our Proposal
Since you mentioned wanting a long-lasting renovation rather than just protective agents like top coats, we proposed a complete “urethane waterproofing project” for the roof.
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 installing the urethane waterproofing.
By applying the ventilation buffer sheet first, the air rising from the building is suppressed by the ventilation sheet and expelled through a “ventilation pipe.”
This can prevent the most common issue with waterproofing, which is bulging of the waterproof layer!
After explaining the materials and methods, we were entrusted with the project among four competing estimates!
Timing for Waterproofing Work
Already Experiencing Leaks
If leaks have already occurred, it is necessary to address the issue promptly before the damage expands.
If left unattended, it can negatively affect the interior and underlying structures, so it is essential to stop the leaks quickly.
Bulges or Cracks in the Waterproof Layer
If the waterproof section is cracked, it can lead to rainwater intrusion.
If the waterproof layer is bulging, it indicates that moisture is accumulating within the layer.
Bulges 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 Durability Years
Generally, the durability of waterproofing work is between 10 to 20 years.
Of course, the durability 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, allowing 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.
We provide detailed explanations about the advantages, disadvantages, and maintenance methods of PVC sheet waterproofing in the article below.
For waterproofing work | Click here for PVC sheet waterproofing work!
4. Long Sheet Waterproofing
Long sheet waterproofing, officially known as “anti-slip vinyl floor sheet,” is commonly used in shared areas and stairs of condominiums 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 capability.
It is rarely used in areas like the rooftops of condominiums where people do not frequently enter.
We provide detailed explanations about the advantages, disadvantages, and maintenance methods of long sheet waterproofing in the article below.
For waterproofing work | Click here for long sheet waterproofing work!
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 in 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 seems that about 80% of single-family home balconies use FRP waterproofing.
However, it is not suitable for installation on large areas, making it less appropriate for rooftops.
We provide detailed explanations about the advantages, disadvantages, and maintenance methods of FRP waterproofing in the article below.
Waterproofing Work | Click here for FRP Waterproofing!
6. Asphalt Waterproofing
Asphalt waterproofing is 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 pressed down 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 Fujisawa City.
Among the numerous contractors, there are likely many who feel, “I don’t know who to ask for help…”
Choosing the right contractor can be challenging at first, so I will explain 5 points to keep in mind when requesting waterproofing work.
● Have extensive experience in waterproofing work
● Confirm the presence of aftercare and warranty
● Obtain estimates from multiple contractors (at least 3 companies)
● Check if they perform waterproofing work in-house
● Carefully review the details of the waterproofing estimate, including processes and materials used
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 construction troubles are caused by poor workmanship during installation.
To prevent troubles, it is important to hire an experienced and trustworthy contractor!
You need to refer to the contractor’s website for their past work and reviews to make a judgment.
There are also contractors who showcase their achievements on social media platforms like Instagram, so checking those can be effective!
It is also effective to look at waterproofing construction companies on review sites for reference!
A particularly recommended review site is “Google”.
Since contractors cannot delete low ratings on their own, it provides reliable 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 poor workmanship or defects occur after construction, let’s confirm whether they provide a “construction warranty”!
Contractors who offer warranties are usually confident in their work, making them more trustworthy!
If waterproofing construction is performed, make sure to take photos of the hidden areas during the process for confirmation!
Check for leaks during rainy weather after the waterproofing work, and if anything arises, contact the contractor immediately as it will facilitate smooth communication shortly after the construction!
Additionally, to ensure early detection of any defects that may occur, confirm whether they conduct thorough aftercare maintenance!
Since non-specialized contractors may not notice signs of defects or troubles, having a specialized contractor perform regular aftercare maintenance can prevent issues before they arise!
Our company sends out aftercare maintenance DM every year, so if desired, annual aftercare maintenance is possible!
Obtain estimates from multiple contractors for waterproofing work (at least 3 companies)
When requesting waterproofing work, be sure to obtain estimates from multiple contractors.
We recommend obtaining estimates from at least 3 companies.
Even for the same waterproofing work, costs may vary between contractors, and warranties and after-services may differ as well.
Moreover, 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, check not only the costs but also the details such as “types of materials used” and “construction methods”!
Check if they perform waterproofing work in-house
Confirm whether they perform waterproofing construction in-house!
If a sales company investigates and then requests a subcontractor, it will incur additional time and costs.
Also, there may be cases where customer requests are not communicated 100% to the subcontractor, leading to troubles.
By having one company handle everything from sales to construction, responsible waterproofing work can be performed quickly and cost-effectively. Kakeru Koumuten conducts everything from on-site surveys to actual construction in-house!
Furthermore, in the event of rain 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 based on the construction location and existing substrate.
For example, even with the same urethane waterproofing, there are different types of 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 to check in detail, not just based on cost, whether “the method is appropriate for the substrate?” and “are the materials suitable?”
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 Fujisawa City, please contact Kakeru Koumuten Co., Ltd.
Our company handles many waterproofing projects in Fujisawa City.
Our greatest strength is that we can carry out everything from proposals to temporary scaffolding installation and waterproofing work in-house!
Kakeru Koumuten Co., Ltd. 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 happy to handle even small partial projects!
In addition to waterproofing work, we can also 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 found to be inferior to others, you are welcome to decline!
For information on exterior renovations in Fujisawa City, click here!
For information on exterior painting in Fujisawa City, click here!
For information on roofing renovations in Fujisawa City, click here!
For information on leak repairs in Fujisawa City, click here!
Features of Fujisawa City
Fujisawa City, Kanagawa Prefecture, is located in the central southern part of the prefecture and is the central city of the Shonan area facing Sagami Bay to the south. It is blessed with a mild climate and rich natural environment, and historically, it has flourished as a post town on the Tokaido Road’s fifty-three stations.
Fujisawa City faces Sagami Bay and is characterized by a mild climate throughout the year, influenced by warm currents. There are few days in summer when temperatures exceed 30 degrees, and it rarely drops below freezing in winter. Especially in winter, there is little precipitation, and snow hardly falls, creating a comfortable living environment.
The transportation access is very convenient, with Fujisawa Station served by three lines: the JR Tōkai Main Line, the Odakyu Enoshima Line, and the Enoshima Electric Railway. This allows for good access to urban areas such as Tokyo and Yokohama, with approximately 55 minutes from Fujisawa Station to Shinjuku Station and about 40 minutes from Shōnandai Station to Yokohama Station.
As for tourist attractions, “Enoshima” is famous, offering a variety of leisure facilities such as marine sports and the New Enoshima Aquarium. Additionally, there are historical and cultural landmarks scattered throughout Fujisawa City, including “Isuzu Plaza” and “Stylish Jizo.”
In this way, Fujisawa City is a livable town where the natural environment and urban functions are harmonized, making it a popular destination for tourism and relocation due to its good access to the city center.
Kakeru Koumuten Co., Ltd. offers exterior construction services in Fujisawa City. We provide 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 Tokyo.
Fujisawa City Area List
Fujisawa City Asahicho / Fujisawa City Ishikawa / Fujisawa City Inari / Fujisawa City Imada / Fujisawa City Uchimodori / Fujisawa City Enoshima / Fujisawa City Engyo / Fujisawa City Endo / Fujisawa City Oba / Fujisawa City Dakkyo / Fujisawa City Katase / Fujisawa City Katase Kaigan / Fujisawa City Katase Mejirozan / Fujisawa City Katase Yama / Fujisawa City Kameino / Fujisawa City Karasawa / Fujisawa City Kawan / Fujisawa City Kirihara / Fujisawa City Kugenuma / Fujisawa City Kugenuma Ishigami / Fujisawa City Kugenuma Kaigan / Fujisawa City Kugenuma Sakuragaoka / Fujisawa City Kugenuma Shinmei / Fujisawa City Kugenuma Tachibana / Fujisawa City Kugenuma Hanazawa-cho / Fujisawa City Kugenuma Fujigatani / Fujisawa City Kugenuma Matsugaoka / Fujisawa City Kugenuma Higashi / Fujisawa City Kuzuhara / Fujisawa City Kozuka / Fujisawa City Shimo Todana / Fujisawa City Jonan / Fujisawa City Shōnandai / Fujisawa City Shoubuzawa / Fujisawa City Shirahata / Fujisawa City Zengyo / Fujisawa City Zengyo Saka / Fujisawa City Zengyo Danchi / Fujisawa City Oogiri / Fujisawa City Takakura / Fujisawa City Takaya / Fujisawa City Ritsueishi / Fujisawa City Nagato / Fujisawa City Tsujido / Fujisawa City Tsujido Shindai / Fujisawa City Tsujido Shinmachi / Fujisawa City Tsujido Taiheiyama / Fujisawa City Tsujido Tokai Coast / Fujisawa City Tsujido Nishi Coast / Fujisawa City Tsujido Motomachi / Fujisawa City Todana / Fujisawa City Tenjincho / Fujisawa City Namikidai / Fujisawa City Nishitomi / Fujisawa City Nishimatano / Fujisawa City Hatori / Fujisawa City Hananoki / Fujisawa City Fujigaoka / Fujisawa City Fujisawa / Fujisawa City Hon Kugenuma / Fujisawa City Honmachi / Fujisawa City Hon Fujisawa / Fujisawa City Misono Daisan / Fujisawa City Minami Fujisawa / Fujisawa City Miyahara / Fujisawa City Miyamae / Fujisawa City Mirokuji / Fujisawa City Muraoka Higashi / Fujisawa City Yodota / Fujisawa City Watanai
Consultations via LINE are also very 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!





