Four fire engines and around 25 firefighters tackled a flat fire on Crescent Lane in Clapham.
Part of a first-floor flat in a converted semi-detached house was damaged by fire. Two women left the property before the Brigade arrived and were treated on scene for smoke inhalation.
The fire is believed to have been accidental and caused by self-heating textiles within a tumble dryer.
A London Fire Brigade spokesperson said: "These types of fires often involve textiles that become contaminated with oil, most commonly linseed, massage and cooking oil on tea towels, tablecloths and chef whites. Make sure you check the manufacturer's cleaning recommendations of your textiles before washing.
"Sometimes when materials are cleaned and put in tumble dryers, the heat from the tumble drying cannot escape. This can result in a high enough temperature allowing it to build up to a point where it smoulders and eventually ignites.
"If you are washing and then drying on a hot cycle, always use the cooling cycle on the tumble dryer so it cools down, and allow the heat to dissipate properly before stacking laundered items together.”
The Brigade’s Control Officers took the first call to the fire at 1110 and sent crews from Brixton, Tooting and West Norwood fire stations to the scene. The fire was under control by 1144.