Chronology
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| 1946 | June | Nippon Koei established in Chiyoda-ku, Tokyo. |
|---|---|---|
| 1947 | June | The Kawasaki Plant is established. |
| Sept. | The Sendai Representative Office is established (later promoted to the Tohoku Branch in November 1948 and renamed into the Sendai Branch Office in April 1984). | |
| Oct. | The Company changes its name into Nippon Koei Co., Ltd. | |
| 1949 | Oct. | The Company acquires a special construction business license and is registered following an amendment to the Construction Business Act in June 1974. |
| 1951 | May | The Osaka Office is established (later promoted to the Osaka Branch Office in April 1978). |
| 1954 | Apr. | The Sapporo Office is established (later promoted to the Sapporo Branch Office in April 1984). |
| Apr. | Received order for planning of Baluchaung Power Plant in Burma. | |
| 1956 | Sept. | The Saigon Office is established in Vietnam. |
| 1958 | Apr. | Acquired Nikki Manufacturing Co., Ltd.(name changed to Nikki Corporation in July 1982) |
| 1961 | Jan. | The Civil Engineering Laboratory is established in Hatogaya, Saitama Prefecture (later renamed into the Engineering Laboratory in 1962). |
| Apr. | The Jakarta Office is established in Indonesia. | |
| May | The Company is registered as a first class architect office. | |
| 1962 | Sept. | The Company is registered to engage in surveying services. |
| 1963 | Apr. | Shares listed on the Second Section of the Tokyo Stock Exchange. |
| Aug. | The Yokohama Plant is established (which is now operated as Yokohama Technology Center). | |
| 1964 | Dec. | The Company is registered to engage in construction consultancy. |
| 1969 | Jan. | The Fukuoka Sales Office is established (later promoted to the Fukuoka Branch Office in April 1974). |
| 1970 | June | The Hiroshima Representative Office is established (later promoted to the Hiroshima Branch Office in April 1990). |
| 1973 | Apr. | The Okinawa Sales Office is established (later promoted to the Okinawa Branch Office in April 2018). |
| 1977 | Nov. | The Company is registered to engage in the geological survey business. |
| 1978 | Mar. | New head office building completed in Kojimachi, Tokyo; relocated head office. |
| Sept. | Listing moved to the First Section of the Tokyo Stock Exchange. | |
| 1981 | Apr. | The Manila Office is established in the Philippines. |
| 1982 | Apr. | The Niigata Representative Office is established (later promoted to the Niigata Branch Office in July 2001). |
| Apr. | The Shikoku Representative Office is established (later promoted to the Shikoku Branch Office in April 2002). | |
| 1984 | Mar. | The Kubota fund is established as a charitable trust, after a contribution from the Company's founder Yutaka Kubota. |
| June | The East Africa Office is established in Kenya (later renamed into the Nairobi Office in November 1997). | |
| 1985 | Feb. | The Company is registered to serve as a compensation consultant. |
| Apr. | Chairman Yutaka Kubota is presented with Grand Cordon of the Order of the Rising Sun. | |
| 1986 | Oct. | Koei System Co., Ltd. is established (now a consolidated subsidiary). |
| 1988 | Apr. | The Company is registered to engage in the measurement certification business. |
| 1989 | Feb. | The Company is registered as an electric contractor for non-utility electrical facilities. |
| Oct. | Philkoei International, Inc. established in the Philippines. | |
| 1991 | July | The Chubu Office is established in Nagoya (later promoted to the Nagoya Branch Office in July 1992). |
| Oct. | The Hanoi Office is established in Vietnam. | |
| 1992 | Aug. | PT. Indokoei International* established in Indonesia El Koei Co., Ltd.* established. |
| Oct. | The R&D Center is established at Kukizaki-machi (now in the city of Tsukuba), Ibaraki Prefecture, Japan. | |
| Oct. | El Koei Co., Ltd. is established (now a consolidated subsidiary). | |
| 1993 | Oct. | The Colombo Office is established in Sri Lanka. |
| 1995 | July | KRI International Corp. established (name changed to Koei Research & Consulting Inc. (KRC) in July 2017). |
| 2000 | Oct. | The Company's industry category at the Tokyo Stock Change is changed from construction to services. |
| Oct. | The New Delhi Office is established in India. | |
| 2001 | Oct. | The Kojimachi Office is established at Kojimachi, Chiyoda-ku, Tokyo, Japan. |
| Dec. | As a new plant, the Fukushima Works is established in Sukagawa, Fukushima Prefecture, Japan. | |
| 2003 | Feb. | The Company is designated as a designated investigation institution pursuant to the Soil Contamination Countermeasures Act. |
| July | Nippon Koei Latin America-Caribbean Co., Ltd. established. | |
| Oct. | Nippon Civic Consulting Engineers Co., Ltd. becomes a subsidiary. | |
| 2005 | Mar. | Tamano Consultants Co., Ltd. becomes a subsidiary. |
| 2007 | Mar. | The Middle East Office is established in Jordan. |
| June | Nippon Koei LAC do Brasil Ltda. established in Brazil. | |
| July | The Tokyo Branch Office is established. | |
| 2008 | June | Nippon Koei India Pvt. Ltd. established in India. |
| 2010 | Sept. | NKLAC, Inc. established in Panama (name changed to Nippon Koei LAC, Inc. in September 2011). |
| 2011 | Apr. | The Bangkok Office is re-established in Thailand. |
| 2012 | Jan. | Nippon Koei Vietnam International Co., Ltd. established. |
| Mar. | The Yangon Office is re-established in Myanmar. | |
| Apr. | The Lima Office is re-established in Peru. | |
| 2013 | Apr. | Myanmar Koei International Ltd. established. |
| 2014 | July | System Science Consultants Co., Ltd. becomes a subsidiary. |
| 2015 | Jan. | Kisho Kurokawa Architect & Associates Co., Ltd. established. |
| Jan. | KOEI Energy Co., Ltd established. | |
| Feb. | The Company announces the Group Vision and the Long-Term Management Strategy. | |
| July | The Company announces the Medium-Term Management Plan (NK-AIM). | |
| Oct. | Dhaka Office opened in Bangladesh. | |
| 2016 | Apr. | BDP Holdings Limited, a UK design consultancy company, becomes a subsidiary. |
| 2017 | May | The Singapore Office is established. |
| July | Koei Research & Consulting Inc. established (Koei Research Institute International Corp. and System Science Consultants Co., Ltd. merged). | |
| 2018 | Sept. | Nippon Koei Bangladesh Ltd. established. |
| Dec. | Nippon Koei Energy Europe B.V. established in the Netherlands. | |
| 2019 | Feb. | Quadrangle Architects Limited, a Canadian architectural design company, becomes a subsidiary. |
| 2020 | Apr. | Istanbul Office is established in Turkey. |
| July | New head office building completed in Kojimachi, Tokyo (reconstruction). | |
| 2021 | June | The Company announces the Long-Term Management Strategy. |
| July | Pattern Design Limited, a UK architectural design company, becomes a subsidiary. | |
| 2022 | July | Tamano Consults Co.Ltd. take over the company’s Urban & Spatial Development Business through the company split and changed trade name to Nippon Koei Urban Space Co., Ltd. |
| 2023 | July | Integrated Design & Engineering Holdings Co., Ltd. established. Nippon Koei Co., Ltd. takes over consulting business. |
