Four fire engines and around 25 firefighters tackled a flat fire on Mayes Road in Wood Green.
Part of a flat on the second floor was damaged by fire.
The Brigade was called at 0138 and the fire was under control by 0242. Fire crews from Hornsey, Southgate, Tottenham and Holloway fire stations attended the scene.
The cause of the fire is under investigation by Brigade officers and the Police.