Six fire engines and 35 firefighters and officers were called to a fire at a disused terraced house in Elsworthy Rise, Primrose Hill in the early hours of this morning.
Part of the ground, first and second floors of the building were damaged by fire.
Watch manager Dave Waters, who was at the scene, said: “This house was empty and awaiting redevelopment and so firefighters had to cut through metal security grills before they could access the fire.
"This was a technically difficult fire to tackle, not only was thick black pouring from the building but the floor had partially collapsed. However, crews managed to stop the fire spreading to neighbouring properties.”
The Brigade was called at 0015 and the fire was under control at 0320. Fire crews from Kentish Town, West Hampstead, Euston and Paddington fire stations attended the scene.
The cause of the fire is under investigation.