Leave Waterproofing Work in Nakahara-ku, Kawasaki to Kakeru Koumuten Co., Ltd.!
If you are looking for a waterproofing contractor in Nakahara-ku, Kawasaki,
please contact Kakeru Koumuten.
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
We receive many requests for waterproofing work in Nakahara-ku, ranging from single-family homes to apartment buildings.
“Reasons why Kakeru Koumuten is chosen in Nakahara-ku”
“About the costs of waterproofing work”
“How to choose a waterproofing contractor”
“About subsidies and grants available for waterproofing work in Nakahara-ku”
We will explain the above four points!
This will definitely be helpful for customers considering waterproofing work in Nakahara-ku, Kawasaki, so
please take a look!
Reasons why Kakeru Koumuten is chosen for waterproofing work in Nakahara-ku, Kawasaki
Regarding why our company is entrusted with waterproofing work by customers in Nakahara-ku, Kawasaki,
one reason is that we have a base in Kanagawa Prefecture, but
“Our strengths in waterproofing work that cannot be imitated by other companies”
have 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.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has prepared the following warehouses and material storage areas to provide more affordable and faster waterproofing and other exterior renovation services.
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 performing scaffolding work with our own scaffolding team instead of outsourcing, we can also reduce the costs associated with scaffolding work.
Since everything is handled in-house, we can significantly reduce costs by shortening the construction period!
We have scaffolding materials equivalent to 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 procure 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 check the actual structures and colors available.
2.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., 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 qualified professionals on staff, and we are confident in our construction techniques.
We can handle large-scale waterproofing projects such as those for factories!
4. Warranty and Aftercare
Our waterproofing work comes with a warranty! Depending on the type of waterproofing work, we provide a 5 to 10-year leak warranty. If you have 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 responsibility and address the issue!
Additionally, aftercare maintenance is available every year, and we will send a DM notification for aftercare maintenance once a year. During aftercare maintenance, we will check the entire waterproofing and assess the deterioration status.
5. Flexible and Prompt Response
Our company is equipped to handle various troubles and situations.
If we are unable to access the rooftop for waterproofing checks, we will utilize drones to assess the condition. During leak investigations, we can also conduct inspections using thermal imaging cameras.
We will respond according to our customers’ 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 project, which could cause problems, so we have established a system to keep the same representative throughout.
6. Human Resource Development
To enhance skills, we create models of various buildings and conduct practical training. We regularly provide skill enhancement education so that each staff member can handle various types of buildings.
Possible Subsidies and Grants for Waterproofing Work in Nakahara-ku, KawasakiSubsidies and Grants
Condominium Longevity Promotion Tax Reduction (Property Tax Reduction)
Requirements for Condominium Longevity Promotion Tax Reduction
Condominiums over 20 years old
Total number of units: 10 or more
Completion of longevity improvement work at least once in the past + completion of subsequent work between April 1, 2023, and March 31, 2027
Condominiums with a certified management plan or those that have developed or reviewed a long-term repair plan with advice and guidance from the municipality
The residential floor area of the exclusive part occupies more than 50% of the total
Tax Reduction Details
Eligible: Property tax on the building portion imposed in the year following the completion of the work.
Maximum Reduction: Up to equivalent to 100㎡ per unit
Tax Reduction Rate: The tax amount within the above range is reduced by 1/2 (50%)
Others
Damage considered from natural disasters in waterproofing may include “holes in waterproof sheets caused by flying objects or falling debris due to wind disasters.”
If you are unsure whether it is covered by fire insurance, please feel free to contact us!
About the Cost of Waterproofing Work
⇧ Construction Menu | For information on waterproofing costs, click here
Examples of Waterproofing Work


工事内容
Roof polyurethane waterproofing work (ventilated buffer method)
Ventilation sheet: QV sheet
We received an inquiry from a customer living in Shibuya-ku, Tokyo, stating, “I am concerned about the deterioration of my rooftop, so I am considering waterproofing work. I would like to request a quote first.”
Our Proposal
Since the customer expressed a desire to renovate using a long-lasting method, not just protective agents like topcoats, we proposed waterproofing work using a ventilated cushioning method with high-strength urethane.
Timing for Waterproofing Work
Already Experiencing Leaks
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.
Bloating or Cracking of the Waterproof Layer
If the waterproof section is cracked, it can lead to rainwater intrusion.
If the waterproof layer is bloated, it indicates that moisture is accumulating within the layer.
Bloating 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 between 10 to 20 years.
Of course, the durability can vary depending on the construction method and materials, but for some types of waterproofing, such as urethane or FRP waterproofing, it is recommended to apply surface protective agents (topcoats) approximately every 8 years.
We recommend regular inspections starting from 5 years after construction.
It is important to understand the type of existing waterproofing and perform appropriate maintenance.
If you are unsure about the type of waterproofing, please send us a photo via email or LINE inquiry, and we will assess it for you!
Types of Waterproofing Work
1. Urethane Waterproofing
Urethane waterproofing is a method that involves applying liquid polyurethane resin to the waterproofing surface in layers.
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, which is a significant advantage.
It can be widely applied to areas such as balconies and rooftops.
For more details on the advantages, disadvantages, and maintenance methods of urethane waterproofing, please refer to the article below.
For waterproofing work | Click here for information on Urethane Waterproofing!
2. Rubber Sheet Waterproofing
Rubber sheet waterproofing involves adhering synthetic rubber sheets to the surface to prevent water intrusion.
This method is commonly used for large areas such as rooftops.
One advantage over urethane waterproofing is that there is no waiting for drying, allowing for quicker installation; however, 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 waterproofing work | Click here for information on Rubber Sheet Waterproofing!
3. PVC Sheet Waterproofing
PVC sheet waterproofing uses waterproof sheets made of polyvinyl chloride, and like rubber sheet waterproofing, it prevents water intrusion by adhering sheets to the surface.
Similar to rubber sheets, it is not suitable for complex shapes. Although it is more expensive than rubber sheets and urethane waterproofing, its durability is a significant advantage.
For more details on the advantages, disadvantages, and maintenance methods of PVC sheet waterproofing, please refer to the article below.
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 a waterproofing method commonly applied in areas where people walk, such as shared spaces and staircases in condominiums.
As the name suggests, it is slip-resistant and highly durable and wear-resistant, 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 sheet waterproofing, it may give a slightly lower impression of waterproofing effectiveness.
It is rarely used in areas like the rooftops of condominiums where people do not frequently enter and exit.
For detailed information on the advantages, disadvantages, and maintenance methods of long sheet waterproofing, please refer to the article below.
Waterproofing Work | Click here for information on Long Sheet Waterproofing!
5. FRP Waterproofing
FRP waterproofing involves creating a waterproof layer by hardening glass mat with epoxy resin to prevent rainwater intrusion.
It is commonly applied in single-family home balconies, and the construction period is significantly short, often completed in as little as one day.
Due to its lightweight and cost-effectiveness, it seems that about 80% of single-family home balconies utilize FRP waterproofing.
However, it is not suitable for installation on large surface areas, making it inappropriate for rooftop applications.
For detailed information on the advantages, disadvantages, and maintenance methods of FRP waterproofing, please refer to the article below.
Waterproofing Work | Click here for information on 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 pressed down with cinder concrete.
This type of waterproofing is used in large buildings 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 benefit is its high durability.
For more detailed information on the advantages, disadvantages, and maintenance methods of asphalt waterproofing, please refer to the article below.
Waterproofing Work | Learn more about asphalt waterproofing work here!
How to Choose a Waterproofing Contractor
There are many waterproofing contractors available in Nakahara-ku, Kawasaki.
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 consider 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 work troubles are caused by construction defects during the installation.
To prevent troubles, it is important to hire a reliable contractor with ample experience!
You need to refer to the contractor’s website for their past work 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”, as contractors cannot delete low ratings on their own, making it 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 completed, make sure to confirm whether they provide a “construction warranty“!
Contractors who offer warranties are usually confident 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 verification!
Check for leaks during rainy weather after the waterproofing work, and if there are any issues, contact the contractor immediately, as this will ensure smooth communication shortly after the work is completed!
Additionally, to detect any issues early, confirm whether they conduct thorough aftercare maintenance!
Since non-specialized contractors may not notice early signs of problems or troubles, having a specialized contractor perform regular aftercare maintenance can help 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 (at least three)
When requesting waterproofing work, always get estimates from multiple contractors. We recommend obtaining estimates from at least three companies.
Even for the same waterproofing work, costs may vary between contractors, as well as warranties and after-service options.
Moreover, obtaining multiple estimates makes it easier to negotiate prices. To request at the lowest possible cost, it is essential to get estimates from several contractors. When comparing estimates, be sure to check not only the costs but also the “types of materials used” and “construction methods” for detailed comparisons!
Confirm whether they perform waterproofing work in-house
Check whether they perform waterproofing work 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 fully communicated to the subcontractor, leading to troubles. By having one company handle everything from sales to construction, responsible waterproofing work can be carried out quickly and cost-effectively. Kakeru Koumuten conducts everything from on-site surveys to actual construction in-house!
In the unlikely event that a leak or trouble occurs, a company that employs its own craftsmen can respond to and resolve issues quickly!
Carefully check the details, process, and materials used for waterproofing estimates
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 “ventilation buffer method,” and there are various types of urethane waterproofing materials, including “high-strength specification,” “heat-insulating specification,” and “slip-resistant specification.” 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 appropriate for the substrate?” and “are the materials suitable?”
So, if the materials used are only “urethane waterproofing materials,” make sure to check the product name and confirm what kind of materials they are!
If you are looking for a waterproofing contractor in Nakahara-ku, Kawasaki, please contact Kakeru Koumuten Co., Ltd.
Our company has handled many waterproofing projects in Nakahara-ku, Kawasaki. 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 achievements 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, making all exterior renovations possible in-house.
We are confident that we will not be outdone by other companies in terms of cost, quality, and efficiency in exterior work!
We welcome competitive estimates with confidence! Our estimates are completely free, and if we are found to be inferior to other companies, please feel free to decline!
Click here for exterior renovations in Nakahara-ku, Kawasaki!
Click here for exterior painting in Nakahara-ku, Kawasaki!
Click here for roof renovations in Nakahara-ku, Kawasaki!
Click here for leak repairs in Nakahara-ku, Kawasaki!
Characteristics of Nakahara-ku, Kawasaki
Nakahara-ku, Kawasaki, is located in the central part of the city, with a population of about 270,000 (as of 2023), making it the most populous ward in Kawasaki. It is an area that stretches along the Tama River and has developed as a transportation and industrial hub since ancient times. In recent years, redevelopment has progressed, leading to an increase in high-rise condominiums, while traditional shopping streets and residential areas remain, creating a vibrant urban landscape.
The climate is mild, with relatively gentle winters that are easy to endure, and summers that have the typical heat of urban areas, although the breeze along the Tamagawa River can bring some coolness. Throughout the year, stable weather continues, creating an environment that is comfortable to live in.
In terms of access, the JR Nambu Line and the Tokyu Toyoko and Meguro Lines run through the area, with Musashi-Kosugi Station at the center, providing excellent access to Tokyo and Yokohama. Particularly, Musashi-Kosugi Station is close to Shin-Yokohama Station, where the Shinkansen stops, making it a convenient location for both business and travel. Additionally, the bus routes are well-developed, allowing for smooth movement both within and outside the ward.
The charm of Nakahara Ward lies in its balance of urban convenience and livability. The Musashi-Kosugi area is home to large commercial facilities and office buildings, offering a wide variety of shopping and dining options. On the other hand, there are many natural spots and parks along the Tamagawa River within the ward, providing a relaxing environment. The residential areas are predominantly high-rise condominiums, popular among a wide range of generations from singles to families.
Our company, Kakeru Koumuten Co., Ltd., offers a wide range of exterior construction services in Nakahara Ward, Kawasaki City. We handle waterproofing, roofing, and exterior wall painting work.
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.
List of Areas in Nakahara Ward, Kawasaki City
Ida Sanbai-cho, Nakahara Ward, Kawasaki City / Ida Sugiyama-cho, Nakahara Ward, Kawasaki City / Ida Nakano-cho, Nakahara Ward, Kawasaki City / Ida, Nakahara Ward, Kawasaki City / Ichinotsubo, Nakahara Ward, Kawasaki City / Imai Ue-cho, Nakahara Ward, Kawasaki City / Imai Naka-cho, Nakahara Ward, Kawasaki City / Imai Nishi-cho, Nakahara Ward, Kawasaki City / Imai Minami-cho, Nakahara Ward, Kawasaki City / Okura-cho, Nakahara Ward, Kawasaki City / Kamikodaka, Nakahara Ward, Kawasaki City / Kamishinjo, Nakahara Ward, Kawasaki City / Kamihirama, Nakahara Ward, Kawasaki City / Kamimaruko, Nakahara Ward, Kawasaki City / Kamimaruko Sannou-cho, Nakahara Ward, Kawasaki City / Kamimaruko Tenjin-cho, Nakahara Ward, Kawasaki City / Kamimaruko Hachiman-cho, Nakahara Ward, Kawasaki City / Karishuku, Nakahara Ward, Kawasaki City / Kitadani-cho, Nakahara Ward, Kawasaki City / Kizuki Ise-cho, Nakahara Ward, Kawasaki City / Kizuki O-machi, Nakahara Ward, Kawasaki City / Kizuki Gion-cho, Nakahara Ward, Kawasaki City / Kizuki Sumiyoshi-cho, Nakahara Ward, Kawasaki City / Kizuki, Nakahara Ward, Kawasaki City / Kosugi, Nakahara Ward, Kawasaki City / Kosugi Goten-cho, Nakahara Ward, Kawasaki City / Kosugi Jinya-cho, Nakahara Ward, Kawasaki City / Kosugi-cho, Nakahara Ward, Kawasaki City / Shimo Kodaka, Nakahara Ward, Kawasaki City / Shimo Shinjo, Nakahara Ward, Kawasaki City / Shimo Numabe, Nakahara Ward, Kawasaki City / Shinjo, Nakahara Ward, Kawasaki City / Shinjo Naka-cho, Nakahara Ward, Kawasaki City / Shinmaruko Higashi, Nakahara Ward, Kawasaki City / Shinmaruko-cho, Nakahara Ward, Kawasaki City / Tajiri-cho, Nakahara Ward, Kawasaki City / Todoroki, Nakahara Ward, Kawasaki City / Naka Maruko, Nakahara Ward, Kawasaki City / Nishi Kase, Nakahara Ward, Kawasaki City / Maruko-dori, Nakahara Ward, Kawasaki City / Miyauchi, Nakahara Ward, Kawasaki City
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!





