Four fire engines and around 25 firefighters attended a house fire on Windsor Crescent in South Harrow.
A loft, half of the first floor and part of the ground floor of the house was damaged by fire. Three people left the property before firefighters arrived and there were no reports of any injuries.
The Brigade was called at 1852 and Control Officers mobilised four fire engines and around 25 firefighters from Northolt, Harrow and Wembley fire stations to the scene. The fire was brought under control by 1938.
The cause of the fire is under investigation.