Six fire engines and 35 firefighters and officers were called to a fire at a house under construction in Inglis Way, Mill Hill last night.
Part of the second floor of an end of terrace house was damaged by fire.
The Brigade was called at 2315 and the fire was under control at 0138. Fire crews from Mill Hill, Finchley and Hendon fire stations attended the scene.
The cause of the fire is under investigation.