| 1959 | Incorporation of Nihon Suido Consultants Co., Ltd. in Minato-ku, Tokyo |
|---|---|
| 1962 | Establishment of Mission Statement |
| 1963 | Relocation of Head office to Shinjuku-ku, Tokyo |
| 1965 | Establishment of Group Company: Suikou Service Co., Ltd. |
| 1994 | Relocation of Head office to Shinjuku Square Tower, Tokyo Opening of Indonesia Representative Office |
| 1998 | Certification and registration of Quality Management System [ISO 9001:2015・JIS Q 9001:2015] (except for some departments and divisions) |
| 2001 | Certification and registration of Environment Management System [ISO 14001:2015・JIS Q 14001:2015] (except for some departments and divisions) |
| 2006 | Opening of Korea Representative Office |
| 2007 | Opening of Vietnam Representative Office |
| 2009 | Certification and registration of Information Security Management System [ISO/IEC 27001:2013・JIS Q 27001:2014] (except for some departments and divisions) |
| 2011 | Establishment of Group Company: NSC Tech Co., Ltd. |
| 2012 | PT DACREA Design and Engineering Consultants in Indonesia become our group company. Establishment of Group Company: Io Co., Ltd. |
| 2013 | Sabo Engineering Co., Ltd. become our group company |
| 2014 | Opening of India Representative Office |
| 2015 | Certification and registration of Asset Management System [ISO 55001:2014・JIS Q 55001:2017] (except for some departments and divisions) |
| 2016 | Certification of Construction Business License by Tokyo Metropolitan Government |
| 2018 | Certification of Construction Business License by Minister of Land, Infrastructure, Transport and Tourism Opening of Philippine Branch Opening of Singapore Branch |
| 2019 | Acquired certification of Integrated (quality, environment, information security and asset) Management System |
| 2021 | Opening of China Representative Office |
| 2022 | Company-wide acquired certification of Integrated (quality, environment, information security and asset) Management System |
