Four adults had a lucky escape after the smoke alarms in their home alerted them to a fire last night.
Four fire engines and 21 firefighters and officers were called to a fire at a house in Lots Road, Chelsea.
The second floor of a three-storey terraced house was gutted by fire.
Part of the roof and part of a neighbouring property’s roof were also damaged in the blaze.
The four occupants of the property evacuated the building before the arrival of the Brigade after seeing hearing the smoke alarm and seeing smoke.
Two adults were treated at the scene by London Ambulance Service for smoke inhalation.
A London Fire Brigade spokesperson said: "Yet again smoke alarms help saving lives.
“Our advice is to have a working smoke alarm on every level of your home and the safest option is have the alarms linked together. This will give the earliest warning if there is a fire in your home.”
The Brigade was called at 1731 and the fire was under control at 1949. Fire crews from Battersea, Kensington, Chelsea and Fulham fire stations attended the scene.
The cause of the fire is believed to be a fault in a portable air conditioning unit.