Four fire engines and 21 firefighters and officers dealt with a fire in a block of flats under development on West End Lane in West Hampstead.
Part of an external balcony on the ninth floor was damaged by fire. Around 25 workers left the building before the Brigade arrived
The Brigade was called at 1432 and the fire was under control by 1559. Fire crews from Kentish Town, Wembley, Paddington and West Hampstead fire station were at the scene. The cause of the fire is under investigation.