Three fire engines and around 20 firefighters were called to a fire at a flat on Westbourne Park Road, Notting Hill.
A small part of a four roomed flat on the ground floor was damaged by fire. Firefighters wearing breathing apparatus led one man to safety. He was treated on scene by London Ambulance Service crews for smoke inhalation and taken to hospital.
Smoke alarms fitted in the property sounded and alerted residents to the fire.
A London Fire Brigade spokesperson said: “Don't just fit a smoke alarm in your hall and landing – also fit them in any room where a fire can start. For example, any room where you smoke or leave appliances plugged in.
"But in smoky or steamy rooms like your kitchen or bathroom, a heat alarm is more suitable.
"These will give the earliest warning if there is a fire in your home.”
The Brigade were called at 0413 and the fire was under control by 0441. Fire crews from North Kensington and Kensington fire stations attended the scene.
The cause of the fire is under investigation.