| Aug. 1945 | Construction Technology Institute (Zaidan Hojin Kensetsu Gijutsu Kenkyujo) founded as the first construction consulting company in Japan |
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| Feb. 1964 | Company name changed to CTI Engineering Co., Ltd. |
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| Oct. 1987 | CTI Wing Co., Ltd. established |
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| Sep. 1989 | CTI Ground Planning Co., Ltd. established |
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| Mar. 1933 | CTI Engineering International Co., Ltd. established |
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| Jun. 2006 | Japan Urban Engineering Co., Ltd. joined the Group |
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| Oct. 2010 | Chi-ken Sogo Consultants Co., Ltd. joined the Group |
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| Sep. 2013 | CTI Frontier Co., Ltd. established |
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| Apr. 2015 | CTI Engineering Group’s Mid- to Long-Term Vision CLAVIS 2025 formulated |
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| Jul. 2015 | Environmental Research & Solutions Co., Ltd.joined the Group |
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| Nov. 2015 | NISSOKEN ARCHITECTS & ENGINEERS Co., Ltd. joined the Group |
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| Jun. 2017 | Waterman Group Plc joined the Group |
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| Apr. 2021 | CTI Reed Co., Ltd. established |
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| Aug. 2021 | CTI Engineering Group’s Mid- to Long-Term Vision SPRONG 2030 formulated |
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| Jan. 2023 | CTI Ascend Co., Ltd. established |
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| Apr. 2023 | CTI Engineering Co., Ltd. celebrated its 60th anniversary |
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| Jun. 2024 | Yuasa Consultant Co., Ltd. joined the Group |
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| Nov. 2024 | HIROKEN CONSULTANTS Co., LTD. joined the Group |
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