Four fire engines and around 25 firefighters were called to a flat fire on Stonebridge Park in Brent.
Part of a living room in a third-floor flat was damaged by fire. There were no reports of any injuries.
Station Officer Abid Ali Chaudary, who was at the scene, said: “Crews arrived to find a small fire in the corner of the living room and the flat was heavily smoke logged.
“A man had already left the property before the Brigade arrived and crews worked swiftly to make the scene safe and prevent the fire from spreading further.”
The Brigade was called at 0436 and the fire was under control by 0512. Fire crews from North Kensington, Park Royal, Wembley and Willesden fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.