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| Business year | Business matters | |
|---|---|---|
| 1962 | Establishment of Yachiyo Engineering Co., Ltd. (YEC) | |
| 1963 | Registration of Consulting Engineer and Architect | |
| 1967 | Engineering services for the construction of Shan-ta-jian Dam in Taiwan, the first overseas project of YEC. | |
| 1977 | Establishment of Jakarta Office in Indonesia | |
| 1981 | Number of permanent employees reaches 500 | |
| 1986 | Establishment of Korea Office | |
| 1991 | Establishment of International Division | |
| 1999 | Acquisition of ISO9001 Certificate | |
| 2001 | Acquisition of ISO14001 Certificate | |
| 2004 | Received Project Award from the Engineering and Consulting Firms Association (ECFA), Japan for the Urgent Disaster Reduction Project for Mt. Merapi and Lower Progo River Area in Indonesia | |
| 2009 | Establishment of Kolkata Office in India Establishment of Cairo Office in Egypt Establishment of San Paulo Office in Brazil |
|
| 2010 | Establishment of Nigeria Office | |
| 2013 | Establishment of Yachiyo Green Energy Co., Ltd. | |
| 2014 | Establishment of Myanmar Office Received 50 Years Memorial Project Award for the Project for Strengthening of Solid Waste Management in Dhaka City from ECFA |
|
| 2015 | Number of permanent employees reaches 1000 | |
| 2016 | Appointment of Mr. Norio Hanaoka, Chairman of YEC, as the Chairman of ECFA (until 2018) | 2018 | Establishment of Research Institute for Infrastructure Paradigm Shift | 2019 | Business and Capital Alliance with Aiplan Co., Ltd. | 2021 | Establishment of Vietnam Office | 2022 | Business and Capital Alliance with Wellstone Co., Ltd. |