Four fire engines and around 25 firefighters tackled a house fire on Dane Road in Southall.
Half of a first floor flat was damaged by the fire. There were no reports of any injuries.
Control Officers took the first of five calls at 0148 and mobilised crews from Southall, Ealing and Hillingdon fire stations to the scene. The fire was extinguished by 0229.
The cause of the fire has been recorded as undetermined.