Four fire engines and 21 firefighters and officers were called to a fire at a house in Dicey Avenue, Cricklewood last night.
Part of a loft conversion was damaged by fire.
Six adults and four children left the property before the arrival of the Brigade. There were no reports of any injuries.
The Brigade was called at 2312 and the fire was under control at 0011. Fire crews from Willesden, West Hampstead and Hendon fire stations attended the scene.
The cause of the fire is under investigation.