Nine fire engines and around 65 firefighters and officers were called to a fire at a house under refurbishment on Totteridge Lane in Whetstone, this afternoon.
The whole of the roof, part of which collapsed, was alight and half of the first floor was also alight. Fortunately there were no reports of any injuries.
Steve Dudeney, the Brigade's Borough Commander for Hackney, who was at the scene, said: "Firefighters worked hard to contain the fire and tackled it from all sides of the property as well as from above using an aerial ladder platform.
"The fire is under control but crews will remain at the scene throughout the night and into the morning damping down remaining hotspots."
Totteridge Lane is closed to vehicles and there is heavy traffic in surrounding roads. Motorists are advised to avoid the area.
Fire crews from Finchley, Barnet, Southgate, Mill Hill, Hendon and Stanmore fire stations attended the scene.
The Brigade was called at 1634 and the fire was under control at 2011. The cause of the fire is under investigation.