Four fire engines and around 25 firefighters were called to a house fire on Bakerville Road in Wandsworth. Part of the ground floor was damaged by fire.
Two women and a man left the property before the Brigade arrived. They were suffering from smoke inhalation and treated at the scene by London Ambulance Service crews.
The Brigade was called at 0805 and the fire was under control by 0857. Firefighters from Tooting, Battersea and Wandsworth fire stations were in attendance. The cause of the fire is under investigation.