During the Second World War many institutes of the College of Technology were evacuated from Stuttgart out of fears that they might be destroyed in air raids. When hostilities finally ceased in 1945, 75% of the college had been destroyed. Research in aeronautics was almost completely banned by the Allied Control Council: it had to be reported to the authorities and was subject to the Allies' constant control.
The denazification process had not been completed when the college recommenced research and teaching in February 1946. In 1946 the Aeronautic Engineering Institute (FIST) and Count Zeppelin Research Institute (FGZ) were transformed into the Construction Research Institute at Stuttgart College of Technology (Bauforschungsanstalt an der Technischen Hochschule Stuttgart).