Four fire engines and around 25 firefighters tackled a house fire on Blair Close in Islington.
Half of the ground floor of a mid-terraced house was damaged by fire. One person left the property before the Brigade arrived and was taken to hospital by London Ambulance Service crews. Firefighters wearing breathing apparatus rescued a dog from the building.
The Brigade was called at 0219 and the fire was under control by 0333. Fire crews from Islington, Holloway and Stoke Newington fire stations attended the scene.
The fire is believed to have been accidental and caused by a heated wheat bag in a microwave.