Four fire engines and around 25 firefighters tackled a fire on Challenge Road in Feltham.
Part of a vehicle repair workshop was damaged by fire. There were no reports of any injuries.
The Brigade was called at 0756 and the fire was brought under control by 0923. Crews from Feltham and Twickenham fire stations and a crew from Surrey Fire & Rescue Service attended the scene.
The fire is being treated as accidental.