Four fire engines and around 25 firefighters were called to a fire at a house on Antill Road in Tottenham.
Half of the ground floor and roof, as well as part of the first floor and external fascia were destroyed by fire.
The property where the fire occurred had no smoke detection fitted.
A London Fire Brigade spokesperson said: "This incident shows just how important it is to have working smoke alarms fitted on every level of your property.
“Smoke alarms give the earliest possible warning when a fire starts and we would urge everyone to make sure they have one fitted in every room where a fire can start except kitchens or bathrooms where heat alarms are more appropriate.”
The Brigade was called at 1719 and Control Officers mobilised crews from Tottenham, Hornsey and Stoke Newington fire stations to the scene. The fire was extinguished by 1841.
The fire was accidental and is believed to have been caused by a defect in a fridge freezer.