Ten fire engines and around 70 firefighters were called to a fire at a waste wood recycling plant on Station Road, Greenford.
Approximately 100 tonnes of wood chips were alight. The fire also affected an open-sided storage shed.
Station Manager Richard Abbott, who was at the scene, said: “Firefighters worked hard throughout the night to prevent the fire spreading."
The Brigade was called at 0022 and the fire was under control by 0719. Fire crews from Northolt, Wembley, Southall and surrounding fire stations attended the scene.
The cause of the fire is under investigation.