Firefighters rescued a woman from a bungalow fire on Mount Park in Carshalton.
Part of a semi-detached bungalow was damaged by fire. One woman was treated on scene by London Ambulance Service crews after suffering from smoke inhalation.
The Brigade was called at 0116 and the fire was under control by 0153. Four fire engines and around 25 firefighters from Wallington, Purley, Croydon and Sutton fire stations attended the scene.
The fire is believed to have been accidental and caused by an electrical fault in an extractor fan.