Four fire engines and around 25 firefighters tackled a fire at a block of flats on Clock View Crescent in Caledonian Road.
Most of a four roomed flat on the fourth floor was damaged by the fire. There are no reports of any injuries.
Control Officers took the first of four calls at 0244 and mobilised crews from Kentish Town and Stoke Newington fire stations to the scene. The fire was extinguished by 0346.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.