Four fire engines and around 25 firefighters tackled a fire at a fitness club with dwellings above on Queensway in Bayswater.
A small part of the basement was damaged by the fire. There are no reports of any injuries.
The fire is believed to have been accidental and was caused by self-heating of textiles in 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.”
Control Officers took the first of three calls at 1327 and mobilised crews from Kensington, Paddington, Hammersmith and North Kensington fire stations to the scene. The fire was extinguished by 1431.