Six fire engines and around 40 firefighters tackled a fire at a semi-detached house on Fillebrook Avenue in Enfield.
Part of the first floor and loft conversion were damaged by the fire. One person was treated on scene.
Control Officers took the first of nine calls at 0239 and mobilised crews from Edmonton, Enfield, Chingford and surrounding fire stations to the scene. The fire was extinguished by 0333.
The cause of the fire is under investigation.