Four fire engines and around 25 firefighters were called to a fire at a house on Emmanuel Road in Balham.
Part of the floor in the hallway of an end-of-terraced house was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0909 and the fire was under control by 1030. Fire crews from Tooting, Clapham and Brixton fire stations were at the scene.
The cause of the fire is under investigation.