Four fire engines and around 25 firefighters were called to a flat fire on Willcott Road in Acton.
Part of a flat on the ground floor of a converted house was damaged by the fire. One woman left the flat before the Brigade arrived. She was assessed at the scene for smoke inhalation by London Ambulance Service crews.
The Brigade was called at 2229 and the fire was under control by 2306. Fire crews from Acton, Ealing, Park Royal and Hammersmith fire stations were at the scene.
The cause of the fire is under investigation.