Four fire engines and around 25 firefighters were called to a fire at a house in Collinwood Gardens, Ilford.
Part of the ground floor of the two-storey building was damaged by fire. Two adults and three children left the property before firefighters arrived.
The Brigade was called at 0025 and the fire was under control by 0110. Fire crews from Ilford, Leytonstone and Stratford attended the incident.
The cause of the fire is believed to be a fridge freezer.