Four fire engines and 21 firefighters and officers were called to a fire at a house converted into flats in Raleigh Gardens in Brixton.
Part of a flat on the second floor of the building was damaged by fire.
The Brigade was called at 1958 and the fire was under control at 2106. Fire crews from Clapham, West Norwood and Brixton fire stations attended the scene.
The cause of the fire is under investigation.