Four fire engines and around 25 firefighters were called to a fire at a shop on Craven Park Road, Willesden.
Half of the ground floor shop was damaged by fire.
The Brigade was called at 2349 and the fire was under control at 0100. Fire crews from Park Royal, Willesden, Wembley and Acton fire stations attended the scene.
The cause of the fire is believed to be accidental and due to an electrical fault within a freezer.