Four fire engines and around 25 firefighters were called to a fire at a house on Brabazon Road in Hounslow.
A conservatory of the semi-detached house was destroyed by fire. Part of a roof and most of a ground and first floor was also damaged by fire. There were no reported injuries.
The Brigade was called at 1633 and the fire was under control by 18:15. Fire crews from Feltham, Hayes and Heathrow fire stations attended the scene.
The cause of the fire is believed to be accidental.