Six fire engines and around 40 firefighters were called to a fire at a house on Pollards Hill South in Norbury.
The roof and a small part of the first floor of a detached chalet bungalow were damaged by the fire. One man left the building before the Brigade arrived. He was assessed at the scene by London Ambulance Service crews.
The Brigade was called at 0857 and the fire was under control by 1012. Fire crews from Norbury, West Norwood, Croydon, Mitcham and Tooting fire stations were at the scene.
The fire was accidental and believed to have been caused by an unknown electrical event.