Four fire engines and around 25 firefighters dealt with a static caravan fire on Newyears Green Lane in Harefield.
The fire damaged half of the roof and part of the interior of the caravan.
The cause of the fire is believed to be faulty electrical wiring in the roof.
The Brigade was called at 1613 and the fire was under control at 1710. Fire crews from Ruislip, Hillingdon and Harrow fire stations were at the scene.