Four fire engines and around 25 firefighters were called to a fire at a commercial building on Coronation Road in Park Royal.
A small part of an electrical unit was damaged by fire. There were no reports of any injuries.
The Brigade’s Control Officers were called at 1933 and sent crews from Park Royal, Acton, Wembley and Ealing fire stations to the scene. The fire was under control by 2054.
The fire is believed to have been accidental and caused by an electrical fault.