Four fire engines and around 25 firefighters were called to a fire at a terraced house on George V Way in Perivale.
Most of the of the ground and first floor of the property were damaged by the blaze. A man and a woman left the building before the Brigade arrived. Both were treated at the scene by London Ambulance Service crews.
The Brigade was called at 0535 and the fire was under control by 0636. Fire crews from Wembley, Northolt, and Park Royal and Southall fire stations attended the incident.
The cause of the fire is believe to be a faulty fridge freezer.