Four fire engines and around 25 firefighters tackled a fire at a lower ground car park on Acklam Road in North Kensington.
A pile of building materials was destroyed in the blaze. There were no reports of any injuries.
The Brigade was called at 1600 and the incident was over for firefighters at 1846. Firefighters from North Kensington, Kensington and Paddington fire stations attended the scene.
The cause of the fire is under investigation.