Four fire engines and around 25 firefighters tackled a fire at a storage unit on Harlington Road West in Feltham.
Most of a single storey storage unit was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 1519 and the incident was over for firefighters at 1743. Firefighters from Feltham, Hammersmith, Twickenham and Heston fire stations attended the scene.
The cause of the fire is under investigation.