Four fire engines and around 25 firefighters were called to a fire at a car repair workshop on Collier Row Road in Chadwell Heath.
The whole of a car spray booth inside the workshop was destroyed by the fire.
Ten people left the area before the arrival of the Brigade.
The Brigade’s Fire Investigators believe the fire was accidental with items left too close to a heat source.
The Brigade was called at 0853 and the fire was under control by 1009. Fire crews from Romford, Hainault, Dagenham and Ilford fire stations were at the scene.