Four fire engines and 21 firefighters and officers were called to a fire at a workshop on High Road, Seven Kings, Ilford.
Part of the ground floor was damaged by fire.
The Brigade was called at 1804 and the fire was under control at 2258. Fire crews from Ilford, Dagenham and Barking fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and Metropolitan Police Service.