Four fire engines and around 25 firefighters were called to a fire at a semi-detached house in Lyndhurst Road, Greenford.
Approximately half of the first floor was damaged by fire. A small section of the loft area also sustained fire damage.
The Brigade was called at 1159 and the fire was under control at 1232. Fire crews from Ealing, Hillingdon, Northolt, and Wembley fire stations attended the scene.
The cause of the fire is under investigation.