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Smile House Co., Ltd.

A community-rooted Saitama real estate developer and brokerage with over 40 years in the Konosu area, specializing in newly built detached houses and land subdivision.

Last updated September 29, 2026

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Overview

Smile House Co., Ltd. (スマイルハウス株式会社) is a Japanese real estate company headquartered in Konosu City, Saitama Prefecture. Its official website describes it as a community-rooted business with more than 40 years of history in the Konosu area, and it presents itself as a comprehensive real estate firm covering land acquisition, construction, subdivision, custom housing, brokerage, and property management. The company's main product is newly built detached houses for sale, and it differentiates itself by providing high-quality land plots and homes. The company operates primarily in Konosu City, Kitamoto City, and Okegawa City, with activities extending to Saitama City, Ageo City, and Kumagaya City. Its business scope includes new detached house subdivision, land subdivision, real estate leasing and management (residential and commercial), real estate sales brokerage (new and used detached houses, land, used condominiums, commercial and investment properties), real estate purchase, custom housing, and renovation. According to its company profile, it holds a Saitama Prefecture Governor's real estate license (No. 10564) and a construction business permit (No. 50143), and is a member of the Saitama Prefecture Real Estate Transaction Association. Smile House emphasizes housing quality, self-executed design, construction, management, sales, and after-sales service. It markets a "slightly upscale" positioning, describing its homes as "solid" and offering "a little luxury with great peace of mind." It also offers semi-custom homes where buyers can select floor plans and equipment colors before construction begins, and it provides custom-built housing based on this expertise. The company highlights its after-sales service, including defect liability insurance, and positions its sales staff as knowledgeable housing loan advisors. As of its company profile, Smile House has capital of 12 million yen and 13 employees. Its representative is Dai Sato. The company is located a one-minute walk from Konosu Station on the Takasaki Line and the Shonan-Shinjuku Line. It holds six licensed real estate transaction specialists, two second-class architects, three rental real estate management specialists, two second-class financial planning specialists, and one interior coordinator. The company banks with Saitama Resona Bank and Daiko Bank. It is a private company and does not appear to be listed on any stock exchange.

History

Smile House Co., Ltd. is a real estate company based in Konosu City, Saitama Prefecture, Japan. Its official website states that it has been community-rooted for over 40 years in the Konosu area, though the exact founding year is not provided in the available evidence. The company has grown from land acquisition, construction, and subdivision operations into what it describes as a comprehensive real estate firm, adding custom housing, brokerage, and property management services. According to its company profile, Smile House is led by representative Dai Sato and has capital of 12 million yen with 13 employees. It holds a real estate license from the Saitama Prefecture Governor (No. 10564) and a construction business permit (No. 50143). The company is a member of the Saitama Prefecture Real Estate Transaction Association and banks with Saitama Resona Bank and Daiko Bank. Smile House's main business is newly built detached house subdivision, and it operates primarily in Konosu, Kitamoto, and Okegawa, with activities extending to Saitama, Ageo, and Kumagaya. The company emphasizes self-executed design, construction, management, sales, and after-sales service, and offers semi-custom and custom housing. It also provides brokerage services for new and used homes, land, condominiums, and commercial properties, as well as property purchase, leasing, management, and renovation. The company's website lists recent property transactions and updates, indicating ongoing activity in the local market. Its stated philosophy is to provide "slightly upscale" homes with a focus on quality and safety, and to contribute to the community through its comprehensive capabilities.

Products and positioning

Community-rooted comprehensive real estate company offering "slightly upscale" quality homes with strong after-sales service.

  • Newly built detached houses

    Main product; subdivisions in Konosu and Kitamoto.

  • Land for sale

    Land subdivision projects, including large-scale developments.

  • Custom-built houses

    Custom housing leveraging the company's subdivision expertise.

  • Semi-custom homes

    Homes where buyers can select floor plans and equipment colors before construction.

  • Real estate brokerage

    Brokerage for new and used detached houses, land, condominiums, commercial and investment properties.

  • Property leasing and management

    Residential and commercial leasing and management services.

  • Renovation

    Renovation and barrier-free modification services.

Sources5 sources

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