Four fire engines and around 25 firefighters were called to a maisonette fire on Harrow Road in Maida Hill.
Part of the split level maisonette was damaged by the blaze. Twenty people left the property before the Brigade arrived.
The Brigade was called at 1422 and the fire was under control by 1536. Fire crews from North Kensington, Lambeth and Paddington fire stations were called to the scene. The cause of the fire is believed to be a fault in the fuse board.