Six fire engines and around 40 firefighters were called to a fire at a range of warehouses on Brent Road in Southall.
Part of a single-storey warehouse unit was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 1533 and the fire was under control by 1628. Fire crews from Southall, Hayes, Heston and Hillingdon fire stations were at the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.