Two fire engines and around 10 firefighters were called to a fire in a converted house on Hornsey Lane in Highgate, N6 this morning.
Around 12 people were evacuated before the Brigade arrived.
Part of a three rom flat on the first floor was damaged by the fire.
The Brigade was called at 0830 and the fire was under control by 0855.
Fire crews from West Hampstead and Holloway fire stations were at the scene.
The cause of the fire is now under investigation.