Four fire engines and around 25 firefighters were called to a house fire on Geary Road in Dollis Hill.
Half of the first floor of a semi-detached 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 and taken to hospital by London Ambulance Service crews.
The Brigade was called at 1546 and the fire was under control by 1700. Fire crews from West Hampstead, Park Royal and North Kensington fire stations attended the scene.
The cause of the fire is believed to be accidental.