Four fire engines and around 25 firefighters were called to a fire in a flat in Crowndale Road, Camden.
Part of the three roomed flat, on the third floor, was damaged by fire. Eleven people left the building before the Brigade arrived. There were no reports of any injuries.
The Brigade was called at 1544 and the fire was under control by 1617. Fire crews from Euston, Kentish Town, Islington and Holloway stations attended the incident.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.