Four fire engines and around 25 firefighters were called to a fire at a flat on Bowes Road in Southgate.
Part of a flat on the first floor and part of a loft conversation and the roof were damaged by the blaze. Seven people left the building before the Brigade arrived. There were no reports of any injuries.
The Brigade was called at 0931 and the fire was under control by 1039. Fire crews from Edmonton, Southgate and Tottenham fire stations attended the incident.
The fire is believed to be accidental and was caused by the use of a blowtorch while roofing works were being carried out.