Six fire engines and around 40 firefighters were called to a house fire in Belgrave Place, Belgravia.
A room on the lower ground floor of a mid terraced, three storey property was alight. Two adults and a child left the property before the Brigade arrived.
Crews from Chelsea, Lambeth, Soho, and surrounding fire stations were at the scene.
The Brigade was called at 1330 and the fire was under control by 1443.
The cause of the fire is under investigation.