Four fire engines and 21 firefighters and officers were called to a fire in a block of flats in Totton Road, Thornton Heath.
Half of a four-roomed flat on the second floor was damaged in the fire. There were no reports of any injuries.
The Brigade was called at 2110 and the fire was under control at 2205. Fire crews from Norbury, West Norwood and Croydon fire stations attended the scene.
The cause of the fire is under investigation.