| 1997-09 |
株式会社オープンハウス創業 : 代表取締役に荒井正昭が就任 : 本社を東京都渋谷区に開設 |
| 1997-09 |
Open House Co., Ltd. founded. : Masaaki Arai assumed office as President & CEO. : Opened the Head Office ("Shibuya Sales Center") in Shibuya-ku, Tokyo. |
| 1997-10 |
「株式会社センチュリー21・ジャパン」とフランチャイズ契約を締結 |
| 1997-10 |
Concluded a franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD." |
| 2001-02 |
子会社・株式会社オープンハウス・ディベロップメント（旧社名：創建ビルド）において、自社新築一戸建て住宅の販売を開始 |
| 2001-02 |
Commenced the sale of newly built single-family homes built by the Company itself through the subsidiary Open House Development Co., Ltd. (former company name: Souken Build Ltd.). |
| 2001-08 |
Registered as a First-class Architect Office [No. 46671 registered by the Governor of Tokyo]. |
| 2002-04 |
Obtained the Special Construction License [No. (Special - 14) 117385 issued by the Governor of Tokyo]. |
| 2002-06 |
Opened "Setagaya Sales Center" in Setagaya-ku, Tokyo. |
| 2003-11 |
Relocated the Head Office ("Shibuya Sales Center") within Shibuya-ku, Tokyo. |
| 2004-01 |
Merged the Head Office ("Shibuya Sales Center") and "Setagaya Sales Center," and held a grand opening of a roadside sales center with a total floor area of 300 tsubo (10,675 sq.ft) |
| 2005-09 |
Opened "Kinshicho Sales Center" in Sumida-ku, Tokyo. |
| 2006-10 |
Obtained the Building Lots and Buildings Transaction Business License [No. (1) 7349 issued by the Minister of Land, Infrastructure, Transport and Tourism]. |
| 2007-01 |
Opened "Sakura-Shinmachi Sales Center" in Setagaya-ku, Tokyo. |
| 2007-08 |
株式会社アイビーネット（旧社名：イトーピアビジネスネット株式会社）を伊藤忠商事株式会社より購入、不動産金融事業に進出 |
| 2008-04 |
Opened "Akabane Sales Center" in Kita-ku, Tokyo. |
| 2008-10 |
株式会社オープンハウス・ディベロップメントがマンションの販売を開始 |
| 2008-10 |
Commenced the sale of condominiums through Open House Development Co., Ltd. |
| 2009-04 |
Opened "Nakano Sales Center" in Nakano-ku, Tokyo. |
| 2010-01 |
東京都千代田区丸の内に「丸の内事務所」を開設（本社機能を一部移転） |
| 2010-01 |
Opened "Marunouchi Office" in Marunouchi, Chiyoda-ku, Tokyo (relocated a part of the Head Office functions). |
| 2010-03 |
Opened "Ikebukuro Sales Center" in Toshima-ku, Tokyo. |
| 2010-09 |
米国カリフォルニア州に株式会社オープンハウス・ディベロップメントの100％子会社として、Open House Realty & Investments, Inc.を設立 : 中国上海市に株式会社オープンハウス・ディベロップメントの100％子会社として、旺佳建築設計諮詢（上海）有限公司を設立 |
| 2010-09 |
Established Open House Realty & Investments, Inc. in California, U.S.A. as a wholly owned subsidiary of Open House Development Co., Ltd. : Established Wangjia Architectural Design Consulting (Shanghai) Co., Ltd. in Shanghai, China as a wholly owned subsidiary of Open House Development Co., Ltd. |
| 2011-04 |
Relocated "Mizonokuchi Sales Center" within Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture. : Opened "Yokohama Sales Center" (Yokohama Station east exit) in Nishi-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2011-10 |
東京都千代田区丸の内に株式会社オープンハウス・ディベロップメントの100％子会社として、株式会社ＯＨリアルエステート・マネジメントを設立 |
| 2011-10 |
Established OH Real Estate Management Co., Ltd. in Marunouchi, Chiyoda-ku, Tokyo as a wholly owned subsidiary of Open House Development Co., Ltd. |
| 2012-09 |
「株式会社センチュリー21・ジャパン」との間のフランチャイズ契約を解約 : 自社ブランドによる営業を開始 |
| 2012-09 |
Terminated the franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD." : Commenced sales under the Company's own brand. |
| 2012-10 |
Relocated "Yokohama Sales Center" (Yokohama Station east exit) within Nishi-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2013-01 |
東京都千代田区丸の内に本社を移転 |
| 2013-01 |
Relocated the Head Office to Marunouchi, Chiyoda-ku, Tokyo. |
| 2013-04 |
Opened "Kamata Sales Center" in Ota-ku, Tokyo. |
| 2013-09 |
東京証券取引所 市場第一部に上場（証券コード3288） |
| 2013-09 |
Listed on the First Section of the Tokyo Stock Exchange (Securities Code: 3288). |
| 2013-10 |
Opened "Nishi-Kasai Sales Center" in Nishi-Kasai, Edogawa-ku, Tokyo. |
| 2014-03 |
Opened "Kita-Senju Sales Center" in Kita-Senju, Adachi-ku, Tokyo. |
| 2014-04 |
Opened "Tsunashima Sales Center" in Kohoku-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2014-09 |
Opened "Sasazuka Sales Center" in Sasazuka, Shibuya-ku, Tokyo. |
| 2014-10 |
Opened "Kawasaki Sales Center" in Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2015-01 |
株式会社アサカワホームを連結子会社化 |
| 2015-01 |
Opened "OPEN HOUSE Group Osaka Office" in Kita-ku, Osaka-shi, Osaka. : Converted Asakawa Home Co., Ltd. to a consolidated subsidiary. |
| 2015-07 |
Opened "Jiyugaoka Sales Center" in Jiyugaoka, Meguro-ku, Tokyo. : Opened "Kichijoji Sales Center" in Kichijoji-honcho, Musashino-shi, Tokyo. |
| 2016-04 |
Opened "Nerima Sales Center" in Toyotamakita, Nerima-ku, Tokyo. |
| 2016-09 |
米国テキサス州にOpen House Texas Realty & Investments LLCを設立 |
| 2016-09 |
Established Open House Texas Realty & Investments LLC in Texas, U.S.A. |
| 2016-10 |
株式会社アサカワホームが株式会社オープンハウス・アーキテクトに商号変更 |
| 2016-10 |
Launched the brokerage, single-family home and condominium business in the Nagoya metropolitan area. |
| 2016-10 |
Opened "Sakae Sales Center" in Naka-ku, Nagoya-shi, Aichi Prefecture. |
| 2016-10 |
Changed the trading name of Asakawa Home Co., Ltd. to Open House Architect Co., Ltd. |
| 2017-01 |
Opened "Nippori Sales Center" in Arakawa-ku, Tokyo. |
| 2017-01 |
Opened "Kinshicho Kita Sales Center" in Kinshi, Sumida-ku, Tokyo. |
| 2017-01 |
Changed the name of "Kinshicho Sales Center" (Kotobashi, Sumida-ku) to "Kinshicho Minami Sales Center." |
| 2017-04 |
Opened "Oimachi Sales Center" in Shinagawa-ku, Tokyo. |
| 2017-04 |
Opened "Musashi-Kosugi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2017-07 |
Opened "Kamiooka Sales Center" in Konan-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2017-07 |
Opened "Motoyama Sales Center" in Chikusa-ku, Nagoya-shi, Aichi Prefecture. |
| 2017-09 |
東京都中央区銀座に富裕層向けサービスの拠点として「GINZA SALON」を開設 |
| 2017-09 |
Opened "GINZA SALON" as a center providing services to affluent customers in Ginza, Chuo-ku, Tokyo. |
| 2017-10 |
Opened "Urawa Sales Center" in Nakacho, Urawa-ku, Saitama-shi, Saitama Prefecture. |
| 2017-10 |
Opened "Tsurumi Sales Center" in Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2018-01 |
Opened "Urawa Chuo Sales Center" in Takasago, Urawa-ku, Saitama-shi, Saitama Prefecture. |
| 2018-01 |
Opened "Motosumiyoshi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2018-04 |
Opened "Gokiso Sales Center" in Showa-ku, Nagoya-shi, Aichi Prefecture. |
| 2018-04 |
Opened "Shin-Koiwa Sales Center" in Katsushika-ku, Tokyo. |
| 2018-05 |
米国ハワイ州にOpen House Hawaii Realty & Investments LLCを設立 |
| 2018-05 |
Established Open House Hawaii Realty & Investments LLC in Hawaii, U.S.A. |
| 2018-06 |
不動産特定共同事業許可取得 : 米国ハワイ州のSachi Hawaii- Paci\x{fb01}c Century Properties LLC（不動産仲介業）、 : Sachi Hawaii-Paci\x{fb01}c Century Property Management LLC（不動産管理業）を子会社化 |
| 2018-06 |
Registered as a Real Estate Specified Joint Enterprise. |
| 2018-06 |
Converted Sachi Hawaii-Pacific Century Properties LLC (real estate brokerage business) and Sachi Hawaii-Pacific Century Property Management LLC (property management business) in Hawaii, U.S.A. to subsidiaries. |
| 2018-07 |
Opened "Shin-Kawasaki Sales Center" in Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2018-10 |
株式会社ホーク・ワンを完全子会社化 |
| 2018-10 |
Converted HAWK ONE CORPORATION to a wholly owned subsidiary. |
| 2018-10 |
Opened "Musashi-Urawa Sales Center" in Numakage, Minami-ku, Saitama-shi, Saitama Prefecture. |
| 2018-10 |
Opened "Kawaguchi Sales Center" in Kawaguchi-shi, Saitama Prefecture. |
| 2018-10 |
Opened "Kanayama Sales Center" in Naka-ku, Nagoya-shi, Aichi Prefecture. |
| 2018-10 |
Opened "OPEN HOUSE Group Fukuoka Office" in Fukuoka-shi, Fukuoka Prefecture. |
| 2018-11 |
Opened "Noborito Sales Center" in Tama-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2019-06 |
株式会社群馬プロバスケットボールコミッション（群馬クレインサンダーズの運営会社）に資本参加 |
| 2020-01 |
Opened "Ohashi Sales Center" in Minami-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2020-04 |
Opened "Ozone Sales Center" in Kita-ku, Nagoya-shi, Aichi Prefecture. |
| 2020-04 |
Opened "Ogikubo Sales Center" in Suginami-ku, Tokyo. |
| 2020-04 |
Opened "Kameari Sales Center" in Katsushika-ku, Tokyo. |
| 2020-05 |
株式会社プレサンスコーポレーションの株式を取得し、 持分法適用関連会社化 |
| 2020-05 |
Opened "Urayasu Sales Center" in Urayasu-shi, Chiba Prefecture. |
| 2020-05 |
Acquired shares of PRESSANCE CORPORATION Co., Ltd., and converted it to an equity-method affiliate. |
| 2020-07 |
Opened "Ropponmatsu Sales Center" in Chuo-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2020-10 |
株式会社オープンハウス・プロパティマネジメントが不動産管理業務を開始 |
| 2020-10 |
Opened "Narimasu Sales Center" in Itabashi-ku, Tokyo. |
| 2020-10 |
Opened "Funabashi Sales Center" in Funabashi-shi, Chiba Prefecture. |
| 2020-10 |
Open House Property Management Co., Ltd. launched the property management business. |
| 2020-11 |
Opened "Tenjin Mansion (Condominium) Gallery" in Chuo-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2021-01 |
株式会社プレサンスコーポレーションの株式を追加取得し、連結子会社化 |
| 2021-01 |
Acquired additional shares of PRESSANCE CORPORATION Co., Ltd., and converted it to a consolidated subsidiary. |
| 2021-02 |
Opened "Omiya Sales Center" in Omiya-ku, Saitama-shi, Saitama Prefecture. |
| 2021-03 |
株式会社OHリアルエステート・マネジメントが株式会社オープンハウス・リアルエステートに商号変更 |
| 2021-03 |
Changed the trading name of OH Real Estate Management Co., Ltd. to Open House Real Estate Co., Ltd. |
| 2021-03 |
Relocated "Shin-Yokohama Sales Center" to Midori-ku, Yokohama-shi, Kanagawa Prefecture, and changed the name of the sales center to "Nakayama Sales Center.". |
| 2021-04 |
Opened "Ofuna Sales Center" in Kamakura-shi, Kanagawa Prefecture. |
| 2021-04 |
Opened "Takabata Sales Center" in Nakagawa-ku, Nagoya-shi, Aichi Prefecture. |
| 2021-04 |
Opened "Kasugabaru Sales Center" in Kasuga-shi, Fukuoka Prefecture. |
| 2021-07 |
Opened "Shimokitazawa Sales Center" in Setagaya-ku, Tokyo. |
| 2021-07 |
Opened "Kashiwa Sales Center" in Kashiwa-shi, Chiba Prefecture. |
| 2021-08 |
（株）おうちリンクが銀行代理業を開始 |
| 2022-01 |
純粋持株会社へ移行し、「株式会社オープンハウス」より「株式会社オープンハウスグ ループ」に商号変更 : *事業部門は 100%子会社となる「株式会社オープンハウス(旧:株式会社オープ ンハウス準備会社)」に承継 |
| 2022-01 |
Shifted to a pure holding company structure, and changed the company name to Open House Group Co., Ltd. : * Succeeded its business divisions to the Company's wholly-owned subsidiary, Open House Co., Ltd. (former Open House Preparatory Company Co., Ltd.) |
| 2022-04 |
東京証券取引所 プライム市場へ移行 |
| 2023-01 |
本社を千代田区丸の内・JPタワーへ移転 |
| 2023-01 |
The head office relocated to JP Tower in Marunouchi, Chiyoda-ku, Tokyo. |
| 2023-10 |
株式会社三栄建築設計の株式を取得し、連結子会社化 |
| 2023-10 |
Acquired shares of Sanei Architecture Planning Co., Ltd. and made it a consolidated subsidiary |
| 2023-11 |
株式会社三栄建築設計の株式を追加取得し、完全子会社化 |
| 2023-11 |
Additionally acquired shares of Sanei Architecture Planning Co., Ltd. and made it a wholly-owned subsidiary |
| 2024-03 |
株式会社三栄建築設計が株式会社メルディアに商号変更 |
| 2024-03 |
Sanei Architecture Planning Co., Ltd. changes its company name to Meldia Co., Ltd. |
| 2025-04 |
株式会社プレサンスコーポレーションの株式を追加取得し、完全子会社化 |
| 2025-04 |
Additional acquisition of shares of PRESSANCE CORPORATION Co.,Ltd., making it a wholly-owned subsidiary |
