The blaze broke out at a end-of-terrace house converted into flats on Lyncroft Gardens.
In that fire, part of the roof of the building was alight and firefighters evacuated around 25 people to safety, but there were no reports of any injuries.
Station Commander Ken Spratt, who was at the scene, said: “West Hampstead Fire Station has been set up as a rest centre for residents affected by the fire.”
The first call was made to LFB at 03:09 and crews from West Hampstead, Paddington, North Kensington, Hendon and surrounding fire stations attended the scene.
