Four fire engines and around 25 firefighters were called to a fire at a house on Whitethorn Avenue in West Drayton.
Most of the first floor of a terraced house was damaged by fire. One man left the property before the arrival of the Brigade. He was treated at the scene for smoke inhalation by London Ambulance Service crews and was taken to hospital.
The Brigade was called at 1839 and the fire was under control by 1938. Fire crews from Hillingdon, Heathrow, and Southall fire stations attended the scene.
The fire is believed to be accidental.