Four fire engines and around 25 firefighters were called to a house fire on Pawsons Road in Croydon.
Part of the first floor of a semi-detached house was damaged by fire. Three people left the building before the Brigade arrived. There were no reports of any injuries.
The Brigade's Fire Investigators believe the fire was accidental and involved a tumble dryer.
A London Fire Brigade spokesperson said: "It's important to make sure you’re aware of white goods safety and to check your appliances.
“If your white goods start making a strange noise, don’t ignore it. If you think there’s a problem always unplug it and contact the manufacturer or a qualified repair technician.
“Most fires where white goods are the source of ignition are not down to anything you have done – so always make sure you register your appliances as you’ll be informed if any issues are identified with the product you’ve bought.
“You should also always keep your white goods in a safe place out of the way as if a fire does break out you will need clear escape routes."
The Brigade was called at 1500 and the fire was under control by 1547. Fire crews from Croydon, Norbury and West Norwood fire stations attended the scene.