Four fire engines and around 25 firefighters were called to a flat fire on Offord Road in Islington.
A small part of a four roomed flat within a residential block was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0524 and the fire was under control by 0604. Fire crews from Islington, Holloway, Euston and Shoreditch fire stations were at the scene.
The cause of the fire is under investigation by the Metropolitan Police and the Brigade.