| Christian era | Outline |
|---|---|
| 1946 | Company established by its founder Mr. Kubota |
| 1953 | Mr. Kubota reconnoitered areas in Thailand, Indonesia, Burma, etc. |
| 1959 | Mr. Kubota led a UN survey team to examine development potential of the Mekong river |
| 1961 | Jakarta office established in Indonesia |
| 1964 | ECFA (Engineering Consulting Firms Association, Japan) set up under the chairmanship of Mr. Kubota |
| 1978 | New head office building completed in Kojimachi, Tokyo |
| 1981 | Manila office established in the Philippines |
| 1984 | Nairobi office established in Kenya |
| 1991 | Hanoi office established in Vietnam |
| 1992 | New Research & Development Center established in Tsukuba Science City (67,600sq.m) |
| 1993 | Colombo office established in Sri Lanka |
| 2000 | Nippon Koei U.K. Co., Ltd. established |
| 2001 | Vientiane office established in Lao PDR New Delhi office established in India |
| 2003 | Nippon Koei Latin America-Caribbean Co., Ltd. established |
| 2007 | The Middle East office established in Jordan |
| 2008 | GMS(Greater Mekong Sub region) office established in Vietnam |
