If you are looking for an exterior wall siding contractor in Kakeru Koumuten, Setagaya-ku, Tokyo

Estimates and consultations are free!
We welcome competitive estimates!

What is the exterior wall cover method?

We will explain in detail the recommended points and precautions of the exterior wall cover method!

The exterior wall cover method is a construction method that overlays a new exterior wall on top of the existing exterior wall.
It is possible to overlay various types of exterior walls such as ALC walls, ceramic siding, and mortar walls.
The exterior materials used in the exterior wall cover method are generally lightweight and durable metal siding.

While the costs are higher compared to exterior painting, it is a method of exterior wall renovation that has various benefits and is gaining attention year by year.

Why is the exterior wall cover method so popular?

We would like to introduce the “5 points” that make Kakeru Koumuten’s exterior wall cover method well-received!

Point 1　Super high durability!!

Metal siding offers an overwhelmingly high expected durability compared to exterior wall painting.
Made of Galvalume steel, SGL steel, and aluminum, there are various types of metal siding, but with aluminum, you can expect a durability of over 40 years!
Additionally, unlike ceramic siding or mortar exteriors, it does not crack or break, making its sturdiness one of its advantages!
If you use high-durability sealing materials, maintenance will be unnecessary for nearly 30 years!

Point 2　Improved Insulation!!

Cross-section of metal siding

The metal siding used in the exterior wall cover method has integrated insulation material.
Moreover, by installing battens before the metal siding installation to create a ventilation layer, the insulation performance is significantly improved!
This improvement in insulation is one of the major benefits of metal siding.

Point 3　Comprehensive Warranty for Peace of Mind!!

While many construction companies offer their own warranties for exterior wall painting, manufacturer warranties are generally not included.
Metal siding comes with solid manufacturer warranties such as coating and perforation guarantees, providing a high level of peace of mind for long-term exterior renovations!

Point 4　Improved Waterproofing!!

With the exterior materials being double-layered, waterproofing is significantly enhanced to prevent rainwater intrusion.
Applying waterproof paper before installation further increases waterproofing!

Point 5　Enhanced Aesthetics!!

Various designs such as wood grain and tile patterns

Metal siding allows for a finish that resembles new construction, which cannot be achieved with exterior painting.
There are various designs available, ranging from simple styles to tile-like and wood grain patterns.
You can choose from a variety of designs that match the atmosphere of the building and your preferences!
Major manufacturers include Aiji Giken, Keimyuu, Nichiwa, and Asahi Tostem, each offering a range of types and designs of metal siding.
If you find a product of interest in the catalog, you can also request cut samples!

What are the points to be aware of when doing exterior wall cover work with metal siding?

Next, we will explain the “three points to be cautious about” when using metal siding for exterior wall cover methods!

Caution 1　Few contractors can perform the work

There are significantly fewer contractors capable of performing the cover method with metal siding compared to exterior painting contractors.
Many inexperienced contractors exist, leading to a higher occurrence of troubles.
Since there is often a variation in estimation costs, to ensure a satisfactory construction, if you are considering the exterior wall cover method with metal siding, make sure to obtain estimates from three or more companies and carefully review the details!

Caution 2　Prone to dents and scratches

Metal siding can develop dents from impacts when objects hit it.
Additionally, being prone to scratches is one of its drawbacks.
If noticeable scratches occur and are a concern, you can request repairs from a specialized repair contractor!

Caution 3　Long construction period

Exterior wall cover work can be considered the most extensive among exterior renovations.
While exterior painting typically takes about 2 to 3 weeks, exterior wall cover work can often take nearly a month.
The long construction period can be a source of stress for residents, making it one of the disadvantages.

Examples of exterior wall cover work

Construction Details

Exterior wall cover work

Completion Date

January 2025

Inquiry Details

I am considering a renovation of the exterior walls. I would like to use high-durability metal siding with a solid warranty. Since this will be a comparative estimate, I would like to request a quote for the same metal siding as the estimates from other companies.

Proposal Details

We have proposed a roof overlay method using metal siding as per your request. Since you had several preferred metal sidings, we have created separate estimates for each one! You entrusted us with the metal siding “Aijii Kogyo/SF-Gal Stage Shine”! The above siding is made of Galvalume steel with heat-insulating fluorine coating, and it is integrated with insulation material, providing excellent thermal insulation. You mentioned that you obtained estimates from three companies, and we were able to secure your order due to our competitive pricing and thorough explanations compared to other companies!

Price Range

2,000,000 to 2,100,000 yen

Construction Period

Approximately 3 weeks

Existing Exterior Material / New Exterior Material

Existing exterior: ALC 　New exterior: Metal siding (Aijii Kogyo/SF-Gal Stage Shine) 　Material: Galvalume steel with heat-insulating fluorine coating 　In-house warranty: 10 years 　Manufacturer warranty: Fading 10 years, rust 10 years, perforation 10 years 　Furring strips: Made of resin

1. Painting of Auxiliary Parts

2. Removal of Equipment

3. Substrate Adjustment

4. Waterproof Paper Installation (may not be necessary)

5. Installation of Battens

6. Fabrication of Metal Flashings

7. Main Construction

8. Sealing at Various Locations

9. Reinstallation of Equipment

10. Completion

About the Costs of Exterior Wall Covering Work

This is a reference table for the estimated costs of exterior wall cover work.
It is an estimate for the cost of performing the exterior wall overlay method on a building with a floor area of 30 tsubo.

The cost of exterior wall cover work is determined by the following calculation.
Exterior wall area (㎡) × Siding unit price + Equipment removal and installation costs + Additional painting costs = Total amount
This will be the total.

Material	Expected Durability (Years)	Cost Assuming a building area of 30 tsubo (150㎡)
Galvalume Steel	30 to 35 years	Including tax Approximately 2,000,000 yen (Siding unit price 11,000 yen/m²~)
SGL Steel	35 to 40 years	Including tax Approximately 2,200,000 yen (Siding unit price 12,500 yen/m²~)
Aluminum	40 years or more	Including tax Approximately 2,500,000 yen (Siding unit price 14,000 yen/m²~)

The amount will vary depending on the number of attached parts and windows to be painted, as well as the equipment to be removed and reattached.
Please note that this is just a guideline amount, and detailed estimates are completely free, so feel free to contact us.

How to Choose a Siding Contractor

There are fewer contractors that handle exterior wall cover work compared to exterior painting contractors, so it may be difficult to find a reliable contractor, such as “where should I request?”
The most important thing in choosing a contractor and obtaining an estimate is to definitely obtain multiple estimates!

For this reason, when requesting exterior wall cover work, let’s check the following four points.

By confirming the above four points, you will be able to choose a trustworthy contractor.

1. Check the contents and materials of the estimate

When obtaining an estimate for exterior wall cover work, let’s check the following items!

・Is the proposed new siding material suitable for your needs?

Check whether materials that meet your requirements, such as durability and insulation, are being proposed!
Since there are various types of metal siding, such as cost-effective siding and insulation-focused siding, make sure that the proposed siding aligns with your original requirements!

・Is the proposed construction method appropriate?

When performing exterior wall cover work, it is necessary to create a ventilation layer between the existing exterior wall and the new exterior wall material using a method called “ventilation method.”
If you do not create a ventilation layer and directly apply it, moisture cannot escape, leading to mold or corrosion, and may result in peeling or lifting of the exterior wall material.
Check whether the proposed construction is appropriate!

・Are the quantities and construction details described in detail?

If the content is vague, such as “exterior wall cover work 1 set,” it will be difficult to understand the construction method and what the costs are for, making it hard to compare estimates.
Having the lengths of the foundation water cut and edge trim clearly listed with unit prices and quantities will provide peace of mind and help prevent issues.
If there are items of concern that are not included in the estimate, check the reason for their exclusion!

・Check the auxiliary materials to be used!

Check not only the siding itself but also the types of detailed auxiliary materials, such as “types of battens,” “siding fasteners,” and “types of waterproof paper“!
For example, siding fasteners are screws, and the overall cost will vary between iron and stainless steel.
While iron may appear cheaper at first glance, stainless steel is resistant to rust and is a recommended fastener.

2. Confirm the existence of warranties and aftercare maintenance

When choosing a contractor for exterior wall cover work, make sure to check for warranties.

Since exterior wall cover work is one of the more expensive types of exterior renovations, in addition to checking for manufacturer warranties, also confirm whether the company offers its own warranty!
If the contractor has a warranty period, they may provide free repairs within that period.

The warranty period varies depending on the contractor and the scope of work, but a 5 to 10-year setting is common.

Additionally, some contractors offer after-sales service separate from warranties, so be sure to check if the contractor you are considering has after-sales service.

Kakeru Koumuten Co., Ltd. always provides a warranty for exterior wall cover work.
We also offer after-maintenance services and send out annual DM, so if you wish, inspections can be conducted every year.

Warranty and Payment翔工務店の屋根工事、外壁塗装工事、シーリング工事の保証など簡単にご説明させて頂いております！！ 弊社では前金、中間金は頂いておりません！！...

3. Obtain estimates from multiple contractors (at least 3 companies)

When requesting exterior wall cover work, be sure to obtain estimates from multiple contractors.

The cost of the same repair can vary between contractors, as can warranties and after-sales services.

Additionally, obtaining multiple estimates makes it easier to negotiate prices.

To request your desired repair contractor at a lower cost, obtaining estimates from multiple contractors is essential.
When comparing estimates, be sure to consider not only the costs but also the details of the plans, materials, and auxiliary materials!

4. Confirm whether the company performs exterior wall cover work in-house

There are differences in costs between companies that handle in-house construction and those that outsource to external companies, which can also lead to communication errors and other issues with external contractors.

Furthermore, if problems arise after construction, responses may be delayed, or there may be no dealings with external construction companies, leading to potential troubles.
Being able to respond immediately when something happens is one of the reasons why companies that perform in-house construction are recommended!

About Kakeru Koumuten Co., Ltd.

Kakeru Koumuten Co., Ltd. specializes in roofing, exterior wall work, and scaffolding work with complete in-house construction.
By assembling temporary scaffolding and performing exterior wall cover work in-house,
we can keep costs down while ensuring high-quality construction.

Company Introduction

Corporate Profile神奈川で家の外装・屋根の工事、修理なら一番若くて親切な株式会社翔工務店にお任せください。 株式会社翔工務店はリフォームを通して美しく理想の生活空間を創るお手伝いをしています。外装改修、外壁塗装、雨樋修理清掃、屋根の塗装や重ね葺き葺き変えなどの部分的な修理まで、お客様のどのようなご要望にも全力でお応えします。...

Customer Reviews

Service Areas

Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo Metropolis.

Click here for inquiries to Kakeru Koumuten Co., Ltd.!

Possible Subsidies and Grants in Setagaya-ku, Tokyo

The following subsidies may be available in Setagaya-ku, Tokyo.

“Long-term Excellent Housing Renovation Promotion Project”

1. Subsidy Rate:

One-third of the eligible expenses

2. Maximum Subsidy Amount:

Evaluation Standard Type (when a certain level of performance improvement is recognized):​800,000 yen per unit

Certified Long-term Excellent Housing Type (when obtaining certification for long-term excellent housing (renovation)):​1,600,000 yen per unit​

*If renovation work is carried out to accommodate three generations living together, an additional 500,000 yen will be added to the above amounts for young families, child-rearing households, or purchasers of existing homes.

3. Requirements for Receiving Subsidies:

Ensuring Living Space: The floor area (excluding stair parts) of at least one floor must be 40㎡ or more, and the total floor area must be 55㎡ or more.​

Living Environment: If located within areas such as district plans or landscape plans, it must be in harmony with them.​

Development of Maintenance and Preservation Plan: A maintenance and preservation plan must be established for a period of 30 years, detailing the requirements set by the evaluation standards.​

Content of Renovation Work: The renovated residence must meet the following performance criteria.​

Performance Item	Overview	Required/Optional
Measures against deterioration of structural framework	Suppression of decay and termite damage to pillars, floors, etc.	Required
Earthquake Resistance	Ensuring earthquake resistance to prevent collapse even in major earthquakes	Required
Energy Conservation Measures	Insulation of windows, walls, floors, ceilings, and efficiency improvements for water heaters, etc.	Required
Ease of Maintenance and Updates	Facilitating inspection, cleaning, and replacement of water supply and drainage pipes	Optional
Measures for the Elderly, etc. (for multi-family housing only)	Barrier-free design	Optional
Variability (for multi-family residences only)	Facilitates future changes in floor plans, etc.	Optional

4. Other Requirements:

Renovation work for areas pointed out in the inspection including exterior wall and roof painting, exterior wall and roof replacement, and rain gutter replacement.

Conducting Inspections: A current condition inspection by a specialist must be conducted before starting renovation work.​

Creating Maintenance Plans and Renovation History: Develop a maintenance plan after renovation and create and preserve a history of the work.

For detailed conditions and procedures, please check the official website of the Ministry of Land, Infrastructure, Transport and Tourism.

Existing Housing Insulation Renovation Support Project

Overview of the System and Target Construction Categories

System Name: Existing Housing Insulation Renovation Support Project (Ministry of the Environment Subsidy, executed by the Hokkaido Environmental Foundation)

This is a format where you can choose either one of the plans: “Total Insulation” for insulating the entire house or “Living Room Only Insulation” focusing on the windows in the living room. Choose one of the two plans.

Eligible Participants

Single-family homes: Individual owners or those who plan to own in the future.

Multi-family residences (condominiums):

Individual application: Owner or representative of the management association.

Overall application: Representative composed of the management association or owners of the entire building.

Subsidy Amount

Subsidy Rate: Up to 1/3 of eligible expenses

Maximum Subsidy Amount (per dwelling): Up to 150,000 yen

Eligible Products and Construction Conditions

Eligible products must be registered with the secretariat as eligible products, including high-performance building materials (insulation, windows, glass, etc.), with an expected energy-saving effect of 15% or more.

For insulation only in the living room, it is mandatory to “renovate all windows in the living room,” and the methods eligible are “roof overlay (cover method),” “inner windows,” and “outer window replacement.”

For detailed conditions and procedures, please check this website.

Leave your exterior wall cover work to Kakeru Koumuten Co., Ltd., the exterior renovation specialists!

This concludes the information on the exterior wall cover method.

Exterior renovations that significantly improve insulation and provide a stylish look like new construction are limited to exterior wall siding work.
While the costs are higher compared to exterior painting, there are various benefits, making it a recommended exterior renovation.
Importantly, if you are considering exterior wall cover work, be sure to obtain estimates from at least three different companies!

Our company specializes in exterior renovations, so if you have any concerns regarding roofs, rain gutters, or exterior walls, please consult with Kakeru Koumuten Co., Ltd. in Yokohama!

We carry out everything from temporary scaffolding work to roof construction and exterior wall renovation entirely in-house. We are confident that our costs, quality, and efficiency in exterior work surpass those of other companies!
We welcome competitive estimates with confidence!
You will be glad you chose us! We take every request seriously to ensure you feel that way.
Estimates and inspections are free!

If our construction plan is inferior to that of other companies, please feel free to decline!
Rest assured, we do not charge any cancellation fees or travel expenses!

We look forward to your inquiries. Thank you very much.

Consultations via LINE are also very welcome◎

For roofing, guttering, and exterior work and repairs in Kanagawa, contact Kakerukoumuten Co., Ltd..

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!