Four fire engines and around 25 firefighters were called to a fire at a house on Hendon Way in Brent Cross.
Part of the roof of a semi-detached house was damaged by fire. There were no reports of any injuries.
The Brigade was called at 1731 and the fire was under control by 1810. Fire crews from Hendon and West Hampstead fire stations attended the scene.
The cause of the fire is under investigation.