A man was rescued from a house in Hounslow on Sunday (April 26), prompting a fresh warning about the importance of smoke alarms.
Firefighters led the man to safety from a first-floor bedroom at the property in Hounslow Avenue after being called to the blaze just after 9pm.
He was treated for smoke inhalation by medics from the London Ambulance Service.
A spokesman for the London Fire Brigade said four other people had escaped from the building, which had no working smoke alarms, before its crews arrived.
He added that the bedroom was slightly damaged by the blaze, which took half an hour to bring under control.
Watch manager Neil Godden, who was at the scene, said: "The building had no working smoke alarms. Having a working smoke alarm is essential. Every home should have at least one, and it should be tested regularly.
"Smoke alarms provide a vital early warning and buy you extra time to escape if there is a fire. The fire broke out in the evening when the residents were up and about, but if they had been asleep the implications could have been very serious."
Two fire engines and around 10 firefighters and officers from Twickenham fire station attended the incident. The cause of the fire is under investigation.