Exterior Painting for Iida Group Homes: Methods & Key Checks

Hello! We are Kakeru Koumuten Co., Ltd., a roofing, exterior painting, and exterior renovation specialist located in Aoba-ku, Yokohama, Kanagawa Prefecture!

This time, we will provide a detailed introduction to Iida Group Holdings, a holding company that oversees one of the largest detached housing groups in Japan, along with important points to consider for exterior painting (renovation).
Of course, exterior renovations for homes built by Iida Group companies can also be carried out by Kakeru Koumuten, so if you have any concerns regarding your home, whether it be repairs or renovations, please feel free to contact us!

What is Iida Group Holdings?

Iida Group Holdings Co., Ltd. is a holding company that oversees one of the largest detached housing groups in Japan. It was established in November 2013 through the management integration of six major housing companies: Hajime Kensetsu, Iida Sangyo, Toei Housing, Tact Home, Arnest One, and ID Home, and is listed on the Prime Market of the Tokyo Stock Exchange.

Source: Iida Group Holdings Official Site “Company Overview”・Iida Group Holdings Official Site “Company Information & Group Company List”

All of these companies often achieve high ratings in the national housing performance display system, such as “seismic resistance grade” and “deterioration countermeasure grade,” and supply numerous housing for sale in Kanagawa and Tokyo areas while keeping prices down and ensuring a certain level of performance.

Source: Iida Group Holdings Official Site “Detached Houses”

Common Exterior Features

Since the houses of Iida Group Holdings are developed by six major housing companies (brands), there may be slight differences in specifications depending on the property, but there are common trends in the exterior wall and roof materials that are often adopted. Here, we will introduce representative specifications and points to know when painting.

Choose a contractor experienced with Iida Group homes.

Common Exterior Wall Materials

We will introduce the main exterior wall materials used by Iida Group Holdings.

Common Roofing Materials

In homes built by the Iida Group, slate roofing materials (such as Colonial) are mainstream. They are lightweight, easy to install, and offer excellent cost performance; however, they are prone to surface deterioration, moss and algae growth, and fading, necessitating regular inspections and maintenance appropriate to the product name and condition of the roofing material.
However, some slate roofing materials, such as Pamir, are not suitable for painting. In some properties, lightweight and durable roofing materials like asphalt shingles may be used. It is important to check the product name and condition of the roofing material to determine whether painting, roof overlay (cover method), or roof replacement work is appropriate. For more details, please see roofing materials that cannot be painted or are not recommended.

Exterior Joints & Sealant

For the joints (seams) of fiber cement siding, caulking (sealing material) that provides waterproofing is used. Over the years, due to UV rays and temperature differences, it hardens and cracks, leading to a decrease in waterproofing.

The vertical joints of the exterior walls are typically treated with a “replacement method,” where the existing sealing is removed and filled anew. On the other hand, for areas where it is difficult to remove the existing sealing, such as around sashes, the “additional filling method” may be chosen after checking the condition and fit. Be sure to check the condition of the sealing along with the exterior wall painting. For detailed construction methods and costs, please see costs for exterior wall painting and sealing work plans.

Key Checks Before Exterior Painting

When painting the exterior walls of buildings from Iida Group Holdings, there are four main points to consider.

Check the Paint Suits Your Walls

When considering exterior painting for Iida Group Holdings, it is important to first confirm whether “the current exterior wall is made of fiber cement siding or ALC.” Particularly, ALC walls tend to have high water absorption and often require specialized undercoating materials (such as elastic fillers), so it is necessary to choose paint and surface treatment suitable for the type of exterior material.

Check Experience with Iida Group Homes

Since Iida Group’s built-for-sale homes have a large number of units, contractors who have worked on many of these homes can provide proposals based on their understanding of details such as siding joint treatment and sealing conditions. Let’s check their actual construction achievements.

Compare Quotes from at Least 3 Companies

When carrying out exterior renovations, do not decide based on just one company; obtain estimates from several companies and compare them! Not only the price but also carefully check the work stages and materials listed in each quote, and confirm whether “the renovation method is suitable for the building? Are appropriate materials being used?” For more details, please refer to Points to Compare in Exterior Wall Painting Estimates.

Check the Warranty & Aftercare

Iida Group’s built-for-sale homes come with a 10-year guarantee from the handover based on the Housing Quality Assurance Act, covering major structural parts and areas preventing rainwater intrusion. This guarantee pertains to the building’s structure and waterproofing, while the exterior paint film (appearance and protection) is generally considered a consumable that deteriorates over time, thus typically excluded from the guarantee. In other words, you can freely choose the contractor for exterior painting, so selecting a contractor with a solid guarantee and aftercare system will lead to peace of mind. For details on Kakeru Koumuten’s construction guarantee, please check Kakeru Koumuten’s Guarantee Details.

Subsidies and Systems Available for Exterior Painting [Latest as of 2026]

As of now (September 2026), there is basically no nationwide subsidy system specifically targeting exterior painting itself. However, it may be possible to combine with systems such as the following, so please check accordingly.

Additionally, some municipalities in Kanagawa Prefecture and Tokyo may have their own housing renovation subsidies or assistance programs related to seismic resistance and energy saving. The availability and conditions of these programs vary by municipality, so if you consult with Kakeru Koumuten Co., Ltd., we can provide you with the latest information for your area. Rest assured, we will not provide unfounded assurances such as “you will definitely be able to use this.”

Frequently Asked Questions (Q&A)

We will answer frequently asked questions regarding the exterior painting of homes from the Iida Group Holdings.

Renovate Your Iida Group Home with Kakeru Koumuten

When you want to remodel a house built by the Iida Group, many people may think that only the house manufacturer can perform the work.

In reality, this is not the case, and there are many contractors with extensive experience.
However, since the buildings of the Iida Group, even though they are built homes, may have different exterior materials (fiber cement siding, ALC exterior walls, etc.) depending on the series, it is important to check which exterior material is used and select the appropriate paint and method for remodeling!

Kakeru Koumuten Co., Ltd. has handled numerous exterior renovations for various house manufacturers.
From temporary scaffolding work to roofing and exterior wall painting, we conduct all work with complete in-house construction, and we are confident that our “cost, quality, and efficiency” in exterior renovation work are unmatched by other companies!

We are confident, so comparison estimates are very welcome and, of course, they are free!

We also offer comprehensive construction guarantees and aftercare services, so you can request our services with peace of mind.

We are committed to ensuring that you feel “I’m glad I chose them!”. Whether it’s roofing, rain gutters, exterior walls, or any minor concerns about your home, or if you are facing sudden troubles, please feel free to consult with us!

We look forward to your inquiries.

Service Areas

Kakeru Koumuten Co., Ltd. is based in Aoba-ku, Yokohama, and can serve almost all areas of Yokohama and Kawasaki, as well as Kanagawa Prefecture and Tokyo. If you have any issues in Saitama, Chiba, or Yamanashi, please feel free to contact us!