Four fire engines and around 25 firefighters were called to a fire at a shop with flats above on Brighton Road in Sutton.
Part of a five roomed flat on the third floor and part of a five roomed flat on the second floor were damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0630 and the fire was under control by 0731. Fire crews from Sutton, Wallington and Mitcham fire stations attended.
The cause of the fire is under investigation.