Four fire engines and 21 firefighters and officers were called to a fire at a block of flats in Gipsy Road, West Norwood.
A small part of a four-roomed flat on the second floor was damaged. There are no reports of any injuries.
The Brigade was called at 1339 and the fire was under control at 1417. Fire crews from Brixton, Tooting and Forest Hill attended the scene.
The cause of the fire is under investigation.