Four fire engines and around 25 firefighters tackled a garage fire on Browngraves Road in Hayes.
A garage was destroyed by fire. Part of a car and a small part of a neighbouring property was also damaged by the blaze. There were no reports of any injuries.
The Brigade was called at 2204 and the fire was under control by 2259. Fire crews from Hayes, Heathrow and Feltham fire stations attended the scene.
The fire is believed to have been accidental and caused by water ingress into the electrical supply.