Four fire engines and 21 firefighters and officers were called to a fire at a workshop in Grosvenor Gardens in Willesden Green.
A single storey workshop at the rear of a property was destroyed by fire. Half of an external walkway was also damaged in the blaze.
The Brigade’s 999 control officers took a total of 29 calls to reports of the fire.
The Brigade was called at 1641 and the fire was under control at 1756. Fire crews from West Hampstead, Park Royal and North Kensington fire stations attended the scene.