Four fire engines and around 25 firefighters tackled a fire at a workshop on Tiverton Road in Tottenham.
A small part of the ground floor, a storage room and the roof were damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0421 and Control Officers mobilised crews from Tottenham, Stoke Newington and Holloway fire stations to the scene. The fire was extinguished by 0527.
The cause of the fire is under investigation.