Four fire engines and around 25 firefighters were called to a shed fire at the rear of Shepherds Hill in Hornsey.
Three wooden sheds near some allotments were completely destroyed by the fire.
The Brigade's 999 Control Officers took 14 calls about the fire.
The Brigade was called at 0112 and the fire was under control by 0208. Fire crews from Hornsey, Holloway, Kentish Town and Finchley fire stations attended the fire.
The cause of the fire is under investigation.