A ground floor flat on Prince of Wales Road in Kentish Town was partly damaged by a fire this morning.
A woman was treated at the scene for shock by the London Ambulance Service.
Four people left the flat before the Brigade arrived.
21 firefighters and officers from Soho, Euston, Holloway and Hammersmith Fire Stations attended the incident.
The Brigade was called at 1103 and the fire as under control at 1154.
The cause of the fire is under investigation.