Four fire engines and 21 firefighters and officers were called to a fire at a block of flats in Comber Grove, Camberwell.
Part of a flat on the first floor of the four-storey block was damaged by fire.
The Brigade was called at 1936 and the fire was under control at 2101. Fire crews from Lambeth, Brixton and Old Kent Road fire stations attended the scene.
The cause of the fire is under investigation.