Four fire engines and 21 firefighters and officers were called to a washing machine alight in Holland Gardens, Brentford.
Half of the kitchen of a flat on the third floor was damaged by fire. There were no reports of any injuries.
The Brigade was called at 1314 and the fire was under control at 1346. Fire crews from Kingston, Chiswick, Hammersmith and Heston fire stations attended the scene.
The cause of the fire is under investigation.