Six fire engines and around 40 firefighters attended a fire at a property on Alma Road in Enfield.
Part of a single-storey workshop was damaged by fire. There were no reports of any injuries.
The Brigade received the first of five calls at 0407 and Control Officers mobilised crews from Enfield, Chingford, Edmonton, Woodford and Tottenham fire stations to the scene. The fire was brought under control by 0526.
The fire is believed to have been caused by an electrical fault.