Points to Note and Construction Methods for Exterior Painting on Buildings of Iida Group Holdings!
Hello! We are Kakeru Koumuten Co., Ltd., a roofing, exterior painting, and exterior renovation specialist located in Aoba-ku, Yokohama, Kanagawa Prefecture!
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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!
Table of Contents
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: Ikken Construction, Iida Sangyo, Toei Housing, Tact Home, Earnest One, and Ide 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”
| Company Name | Brand Name | Features |
|---|---|---|
| Hajime Kensetsu | Libur Garden | Strong cost performance and location power, leading in the group |
| Iida Sangyo | (In-house brand) | “Honor student” with seismic resistance ensured by unique “I.D.S method” |
| Toei Jutaku | Blooming Garden | Focus on long-term excellent housing certification and asset value |
| Tact Home | Graphale | Floor plan design emphasizing livability |
| Arnest One | Cradle Garden | Developing houses with seismic and vibration control “QUIE” |
| ID Home | Linage | Housing for sale pursuing design quality |
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 of Iida Group Holdings
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.
We recommend entrusting the work to contractors with experience in Iida Group Holdings projects!
Main Exterior Wall Materials of Iida Group Holdings
We will introduce the main exterior wall materials used by Iida Group Holdings.
Ceramic Siding
The most commonly used material in homes built by the Iida Group is ceramic siding, which is primarily made from cement and fiber. It offers an excellent balance between cost and design, and various patterns such as brick and tile styles can be selected, making it widely used in pre-built homes.
By repainting before the surface coating deteriorates, you can maintain waterproofing and aesthetics. In some cases, it is possible to apply a clear coat that preserves the original design (pattern) or to repaint with multi-colored patterned paint.
ALC Exterior Walls (Hebel Power Board, etc.)
In properties centered around Ideahome (Renajyu), lightweight aerated concrete (ALC) panels, represented by Asahi Kasei’s “Hebel Power Board,” may be used for exterior walls. This material excels in thermal insulation, fire resistance, and sound insulation.
Like ceramic siding, ALC exterior walls also require maintenance through painting, with a general repainting guideline of about 15 to 20 years.
Hybrid Structure Using I.D.S Method
Iida Sangyo employs a unique “I.D.S method” that combines the design flexibility of wooden frame construction with the high seismic resistance of panel construction. While the structure itself does not limit the type of exterior wall materials, it is common to combine ceramic siding with a frame that enhances seismic resistance.
Features of Roofing Materials from Iida Group Holdings
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.
Joints (Sealing) of Iida Group Holdings
For the joints (seams) of ceramic 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.
Points to Consider When Painting the Exterior Walls of Iida Group Holdings
When painting the exterior walls of buildings from Iida Group Holdings, there are four main points to consider.
Check if the paint is suitable for Iida Group Holdings’ exterior walls
When considering exterior painting for Iida Group Holdings, it is important to first confirm whether “the current exterior wall is made of ceramic 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.
Confirm if the contractor has experience with Iida Group Holdings’ construction
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.
Do not decide based on just one company; always obtain estimates from at least three 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 estimation process and materials used, 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 if there are solid guarantees and aftercare following the construction
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.
Housing Energy Saving 2026 Campaign【Official】
This is a national campaign aimed at renovations that enhance energy-saving performance, such as window insulation renovations (Advanced Window Renovation 2026 Project【Official】) and Water Heating Energy Saving 2026 Project【Official】. While exterior painting itself is not included, if you are renovating to install insulated windows along with exterior painting, there is a possibility of receiving subsidies for the window work. As of September 2026, the budget implementation rate for the Window Renovation 2026 Project is approximately 23%, and for the Water Heating Energy Saving 2026 Project, it is about 43%. Please note that the campaign will end once the budget is exhausted.
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.
Do newly built homes from the Iida Group also require exterior painting?
Do different companies like Ikken Construction, Iida Sangyo, and Earnest One use different exterior materials?
What about warranties for exterior painting on homes from the Iida Group, which are built-for-sale houses?
Many built-for-sale houses have compact floor areas; does this mean lower costs for exterior painting?
Is maintenance of caulking (sealing) necessary separately from exterior painting?
What points should I consider when choosing a contractor strong in Iida Group homes?
Is there a difference in finish quality among remodeling companies?
Is the estimate free? Can I request a comparison estimate?
For residential remodeling of Iida Group homes, choose Kakeru Koumuten Co., Ltd.!
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 (ceramic 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!
Tokyo
Akishima City / Akiruno City / Adachi Ward / Arakawa Ward / Itabashi Ward / Inagi City / Edogawa Ward / Ome City / Ota Ward / Katsushika Ward / Kita Ward / Kiyose City / Kunitachi City / Koto Ward / Koganei City / Kokubunji City / Kodaira City / Komae City / Shinagawa Ward / Shibuya Ward / Shinjuku Ward / Suginami Ward / Sumida Ward / Setagaya Ward / Taito Ward / Tachikawa City / Tama City / Chuo Ward / Chofu City / Chiyoda Ward / Toshima Ward / Nakano Ward / Okutama / Nishi-Tokyo City / Nerima Ward / Hachioji City / Hamura City / Higashi-Kurume City / Higashimurayama City / Higashiyamato City / Hino City / Fuchu City / Fussa City / Bunkyo Ward / Machida City / Mitaka City / Minato Ward / Musashimurayama City / Musashino City / Meguro Ward
Kanagawa Prefecture
Aikou-gun Aikawa Town / Ashigarakami-gun Oi Town / Ashigarakami-gun Kaisei Town / Ashigarakami-gun Nakai Town / Ashigarakami-gun Matsuda Town / Ashigarakami-gun Yamato Town / Ashigarashimo-gun Hakone Town / Ashigarashimo-gun Manazuru Town / Ashigarashimo-gun Yugawara Town / Isehara City / Odawara City / Kamakura City / Kawasaki City / Asao Ward / Saiwai Ward / Takatsu Ward / Tama Ward / Nakahara Ward / Miyamae Ward / Kozukuri-gun Samukawa Town / Zushi City / Chigasaki City / Nakagun Oiso Town / Nakagun Ninomiya Town / Hadano City / Hiratsuka City / Fujisawa City / Miura-gun Hayama Town / Miura City / Minamiashigara City / Yokosuka City / Yokohama City / Aoba Ward / Asahi Ward / Izumi Ward / Isogo Ward / Kanagawa Ward / Kanazawa Ward / Konan Ward / Kohoku Ward / Sakae Ward / Seya Ward / Tsuzuki Ward / Tsurumi Ward / Totsuka Ward / Naka Ward / Nishi Ward / Hodogaya Ward / Yokohama City Midori Ward / Yokohama City Minami Ward / Sagamihara City / Sagamihara City Midori Ward / Sagamihara City Minami Ward / Sagamihara City Chuo Ward / Ebina City / Atsugi City
・Parts of Saitama Prefecture, Chiba Prefecture, and Yamanashi Prefecture (please consult with us)
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