Four fire engines and around 25 firefighters were called to a shed alight on Compton Crescent in Northolt.
A single-storey shed was destroyed by fire. There were no reports of any injuries.
The Brigade’s 999 Control Officers took 18 calls to the fire.
The Brigade was called at 1912 and the fire was under control by 2002. Fire crews from Northolt, Southall and Hillingdon fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.