Six fire engines and around 40 firefighters were called to a fire at a semi-detached house on The Hermitage in Richmond.
The alarm was raised when a neighbour noticed a burning smell and called the Brigade.
The fire started in the ceiling of the bathroom and spread into the loft space of the house. The roof was destroyed by the fire and a small part of the second floor was also damaged. Firefighters led three people to safety. There were no reports of any injuries.
The Brigade was called at 0522 and the fire was under control by 0818. Fire crews from Richmond, Kingston, Twickenham and Chiswick fire stations attended the scene.
The fire is believed to have been caused by heat radiating from a light onto combustible materials over a length of time.