Four fire engines and 21 firefighters and officers were called to a fire at a row of town houses in Jacks Lane, Harefield this afternoon.
The first floor of a house was completely gutted by fire, with the ground floor and roof also partially damaged by fire.
An adjacent property had a small amount of smoke damage.
The Brigade was called at 1448 and the fire was under control at 1614. Crews from Ruislip, Hillingdon, Harrow and Northolt fire stations attended the scene.