Four fire engines and around 25 firefighters tackled a fire at a flat on Lennox Road in Finsbury Park.
Part of a second-floor flat in a four-storey residential block was damaged by fire. One man left the flat before firefighters arrived. There were no reports of any injuries.
The Brigade was called at 1312 and the fire was extinguished by 1340. Crews from Islington, Stoke Newington, Kentish Town and Hornsey fire stations attended the scene.
The cause of the fire is under investigation.