Four fire engines and around 25 firefighters were called to a fire at a house on Furness Road in Harlesden.
Half of the first floor of a mid-terraced house was damaged by fire. There were no reports of any injuries.
The Brigade was called at 2202 and the fire was under control by 2245. Fire crews from Willesden, Park Royal, Acton and Hammersmith fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.