Four fire engines and around 25 firefighters were called to a fire at a house on Oxleay Road in Harrow.
The ground floor of a terraced house was damaged by the fire and a small part of the adjoining property was also damaged. There were no reports of any injuries.
The Brigade was called at 1534 and the fire was under control 1651. Fire crews from Northolt, Wembley, Ruislip and Stanmore fire stations were at the scene.
The cause of the fire is under investigation.