Firefighters rescued three people from a house fire on Dagnall Park in Selhurst.
Half of the first floor of a semi-detached house was damaged by fire. Crews rescued three women from a first-floor balcony using a ladder. They were taken to hospital by London Ambulance Service crews.
The fire is believed to have been accidental and caused by a candle.
A London Fire Brigade spokesperson said: "Candles are one of the most common causes of fire. It’s really important that you never leave a candle unattended and keep them away from anything else that can easily catch alight.
"Firefighters recommend that you have a look at our online Home Fire Safety Checker to make sure there are no hidden hazards in your home.
"The online tool will ask you a series of questions that will help us work out the level of risk in your home, or the home of someone you care for. It only takes a few minutes to get tailored advice to keep yourself and loved ones safe from fire."
The Brigade was called at 0006 and the fire was under control by 0125. Four fire engines and around 25 firefighters from Croydon, Woodside and Norbury fire stations attended the scene.