Thapathali Campus, formerly known as Technical Training Institute (TTI), was renamed and became part of Tribhuvan University (T.U.) as the Institute of Engineering in 1973 AD. In 1977 AD, the campus introduced a two-year proficiency certificate level (PCL) course for SLC students. In 1987 AD, it started offering three-year diploma courses in Mechanical Engineering and Automobile Engineering. In 2002 AD, diploma programs in Electronics Engineering and Computer Engineering were added. The Institute of Engineering (IOE) policy led to the introduction of Bachelor's programs: Industrial Engineering in 2006 AD, Civil Engineering in 2066 BS, Electronics and Communication Engineering in 2067 BS, and Mechanical Engineering in 2068 BS. New intakes in diploma courses ceased in 2014 AD. The campus expanded further with the addition of Bachelor's in Architecture and M.Sc. in Earthquake Engineering in 2015 AD, Bachelor's in Automobile Engineering in 2016 AD, and M.Sc. in Mechanical Design & Manufacturing in 2017 AD. The most recent addition is the M.Sc. in Informatics and Intelligent Systems Engineering in 2020 AD, conducted in the evening session.