Four fire engines and around 25 firefighters were called to a fire at a house on Byron Avenue in Coulsdon.
Part of the first floor of the semi-detached house was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0325 and the fire was under control 0444. Fire crews from Purley, Wallington, Croydon and Norbury fire stations attended.
The cause of the fire is under investigation.