Four fire engines and 21 firefighters and officers dealt with a fire on High Road in Ickenham this morning.
The first floor of a derelict two storey detached house was partly damaged by the blaze.
The Brigade was called at 1048 and the fire was under control by 1141. Fire crews from Ruislip, Harrow and Hillingdon fire stations attended the scene. The cause of the fire is under investigation.