Four fire engines and around 25 firefighters were called to a fire in a car park on Cottage Close in Harrow.
A vehicle in a ground floor car park below a block of flats was destroyed by fire. There were no reports of any injuries.
The Brigade was called at 0036 and the fire was under control by 0110. Fire crews from Northolt, Wembley and Harrow fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.