Four fire engines and around 25 firefighters were called to reports of a fire in the garden of a shop with flats above in Green Lane, Thornton Heath.
An outbuilding was destroyed by fire. Part of the ground floor and first floor of the shop with flats above was also damaged.
The Brigade was called at 1032 and the fire was under control by 1132. Fire crews from Norbury and West Norwood Fire Stations were at the scene.