Four fire engines and around 25 firefighters tackled a fire at a residential block of flats on Welbeck Avenue in Hayes.
Part of a first-floor two-roomed flat and part of the roof of the two-storey building were damaged by fire. There were no reports of any injuries.
The Brigade's 999 Control Officers took around five calls to this fire, with the first call received at 1510. Control Officers mobilised crews from Hillingdon, Northolt and Ruislip fire stations to the scene.
The cause of the fire is under investigation.