The St. Thomas' College of Engineering & Technology was established on 29th of August 2000 on a land measuring 5.276 acre alloted by the St. Thomas' School based on the No Objection Cretificate granted by the Government of West Bengal vide Order No.591-Edn(T) dated 28th December, 1999 issued by the Principal Secretary, Department of Higher Education. The All India Council for Technical Education (AICTE) granted approval vide letter No. 750-80-123(E)/ET/2000 dated 13.07.2000 issued by the Adviser (E&T).

The approval was extended by AICTE for the academic session 2001-02, 2002-03 & 2003-04 vide letters F.No.750-80-123(E)/ET/2000, F.No.750-80-123(E)/ET/2000 F.No.750-80-123(E)/ET/2000 dated July 03 2001, 03.06.2003 & 30th April 2003 respectively. The approval was extended for academic sesssion 2006-07 vide order F.No.750-80-123(E)/ET/2000 dated 15.05.2006.