The fire broke out at a two-storey house in Sturdy Road at 7.45am yesterday (January 11).
Firefighters rescued the woman from a first-floor window using a nine metre ladder.
She was treated by paramedics at the scene for smoke inhalation.
Half of the ground floor of the building was damaged.
Crews from New Cross, Peckham and Old Kent Road stations put the fire out by around 8.30am.
The fire is being treated as accidental, caused by an open fire spreading to floorboards.
A London Fire Brigade spokesperson added: “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.”
