Five tonnes of timber and waste went up in flames at a caravan park in West Drayton on Wednesday night - just yards from dozens of homes.
Four fire engines and some 21 firefighters fought the blaze at Colne Park, which sent flames leaping into the night sky.
It took London Fire Brigade nearly two hours to contain the blaze, which broke out near to dozens of traveller's homes on the static caravan park.
The fire comes after a gas explosion at the same site in 2011 which saw five people, including two elderly women, taken to hospital .
West Drayton has suffered a number of large fires in recent years, such as a garden centre going up in smoke when gas cylinders were said to have exploded near fireworks.
London Fire Brigade (LFB) confirmed they were called to the traveller's site, in Cricketfield Road, just after 9pm last night.
A spokesman for LFB said: "The fire involved approximately five tonnes of timber and waste which were completely destroyed by the blaze. No injuries were reported."
They added: "Fire crews from Hillingdon , Hayes and Heathrow attended the scene. The cause of the fire is believed to be accidental."
Fire crews had contained the blaze by around 10.45pm.
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