Four fire engines and around 25 firefighters were called to a house fire on Mortlake Road in Ilford.
Firefighters tackled a fire at a mid-terraced house, where half of the front of the house and the ground floor were damaged by fire. Part of the roof was also damaged by the blaze. Three adults and one child left the property before the Brigade arrived. One woman was treated at the scene by London Ambulance Service crews.
The fire is believed to have involved a candle.
A London Fire Brigade spokesperson said: "Candles, incense sticks and oil burners are one of the most common causes of fire. We’d recommend swapping traditional candles for safer flameless LED alternatives, but if you do use real candles, it’s so important to never leave them unattended.
“Always make sure that they’re held firmly in heat-resistant holders and placed on a stable surface where they won’t be knocked over."
The Brigade was called at 1312 and the fire was under control by 1358. Fire crews from Ilford, Stratford, Dagenham and Plaistow fire stations attended the scene.