Four fire engines and around 25 firefighters tackled a flat fire on Lincoln Road in Enfield.
Most of a three-roomed flat on the first floor of the building was damaged by fire. Firefighters wearing breathing apparatus rescued a woman via an internal staircase, who was treated on scene by London Ambulance Service crews. A further six people left the building before the Brigade arrived.
The Brigade was called at 1008 and the fire was under control by 1051. Fire crews from Tottenham, Chingford and Enfield fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.