Four fire engines and around 25 firefighters were called to a fire at a university building on Malet Place in Bloomsbury.
A small part of a laboratory in the basement of an 11 storey building was destroyed by fire.
The Brigade's 999 Control room was first called at 1210 and mobilised crews from Lambeth and Kentish Town fire stations to the scene. The fire was under control by 1412.
The cause of the fire is under investigation.