Four fire engines and around 25 firefighters tackled a house fire on Gunnersbury Avenue in Ealing.
Part of the loft conversion was damaged by fire. There were no reports of any injuries.
The Brigade was called at 1317 and the fire was under control by 1357. Fire crews from Acton, Ealing, Chiswick and Richmond fire stations attended the scene.
The cause of the fire is believed to have been electrical.