Four fire engines and around 25 firefighters were called to a fire at a maisonette on Bramham Gardens in Earl's Court.
Firefighters tackled a fire at a six roomed maisonette split over the first and second floor of a five-storey building. Part of the maisonette was damaged by the fire. There were no reports of any injuries.
The Brigade's fire investigators believe the fire was accidental and caused by the self-heating of oil-contaminated rags.
A London Fire Brigade spokesperson said: "Natural fibres, such as cotton found in cloths, are susceptible to spontaneous heating and self-combustion. When this is mixed with materials such as oils or cleaning products, the likelihood of a fire increases as temperatures can build up to a point where the material smoulders and eventually ignites.
"When using oils and cleaning products with cloths, make sure you wash them at the right temperature with the appropriate detergent to remove any oil based contaminants."
The Brigade was called at 0151 and the fire was under control by 0246. Fire crews from Chelsea, Kensington, Fulham and Hammersmith fire stations attended the scene.