Four fire engines and around 25 firefighters tackled a fire at a dental practice on Cricklewood Broadway.
Part of the second floor of the building and half of the staircase and landing from the second to third floor were damaged by fire. There were no reports of any injuries.
The Brigade’s Control Officers took the first of five calls at 0915 and mobilised crews from West Hampstead, Willesden, Hendon and Paddington fire stations to the scene. The fire was under control by 1132.
The cause of the fire is under investigation.