Four fire engines and around 25 firefighters were called to a fire at a maisonette above a shop on London Road, Hounslow.
A maisonette of two floors was damaged by the fire.
The Brigade was called at 1129 and the fire was under control by 1256. Fire crews from Heston, Twickenham and Southall fire stations were at the scene.
The cause of the fire is under investigation.