Four fire engines and around 25 firefighters were called to a fire in a semi-detached house converted into flats on Station Road in Finchley.
Flats on the ground, first and second floor were partly damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0909 and the fire was under control by 1045. Firefighters from Finchley and Hendon fire station attended the scene.
The cause of the fire is under investigation.