Four fire engines and around 25 firefighters were called to a fire at a laundry warehouse on Fourth Way in Wembley.
An external storage unit and a utility room were destroyed by fire. Part of a small room on the first floor of a neighbouring property was also damaged by fire. There were no reports of any injuries.
The Brigade was called at 0250 and the fire was under control by 0505. Fire crews from Wembley, Park Royal and Willesden fire stations attended the scene.
The fire is believed to have started when freshly pressed laundry left in a storage room overheated.