Four fire engines and around 25 firefighters were called to a fire at a house on Tower Gardens Road in Tottenham.
Most of the first floor of the two storey mid terraced house was destroyed by the fire with smoke damage throughout the top floor.
One man and one woman left the property before the Brigade arrived, both were treated by crews on scene for smoke inhalation.
The cause of the fire is believed to be due to an unattended candle.
Station Officer Peter Campbell was at the scene, he said: “Crews arrived on scene to a well developed fire in the bedroom on the first floor. Firefighters wearing breathing apparatus worked hard to extinguish the fire quickly to prevent it spreading to nearby properties.
“Candles, incense sticks and oil burners are one of the most common causes of fire. It’s really important that you never leave a candle unattended and keep them away from anything that can easily catch fire.
“You should also ensure they are in a heat-resistant holder and placed on a stable surface so they won’t be knocked over.”
Firefighters’ candle safety tips
The Brigade was called at 2006 and the fire was under control by 2108. Fire crews from Tottenham, Hornsey, Stoke Newington fire stations were at the scene.