Four fire engines and around 25 firefighters were called to a fire at an outbuilding on High Street in Hounslow.
A single storey outbuilding was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 2025 and the fire was under control by 2256. Fire crews from Heston, Feltham, Twickenham and Southall fire stations were at the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.