Four fire engines and around 25 firefighters were called to a house fire on Frognal Avenue in Harrow.
Part of the first floor and a small part of the loft of a mid-terrace house were damaged by the fire. There were no reports of any injuries.
The Brigade was called at 1523 and the fire was under control by 1643. Fire crews from Harrow, Northolt and Stanmore fire stations were at the scene.
The cause of the fire has been recorded as undetermined.