Four fire engines and around 25 firefighters attended a fire in a car park on Sipson Road in West Drayton.
Around 11 vehicles were damaged by fire. There were no reports of any injuries.
The Brigade received the first of 12 calls about the fire at 1929 and Control Officers mobilised crews from Heathrow, Hayes, Hillingdon and Feltham fire stations to the scene. The fire was extinguished by 2108.
The cause of the fire is under investigation.