Four fire engines and around 20 firefighters and officers have been called to a fire at a house on Madeira Road in Southgate.
The fire left half of the loft conversion in the two floored terraced house damaged by the blaze.
The Brigade was called at 1309 and the incident was under control by 1348. Fire crews from Southgate, Finchley, Edmonton and Tottenham fire stations were at the scene.
The cause of the fire is under investigation.