Four fire engines and around 25 firefighters were called to a fire at a hotel in Welbeck Street in Marylebone.
Crews were called to smoke coming from the ground floor bar area and found a small amount of damage to a wall cavity behind a gas fire. Around 130 staff and guests left the building before the Brigade arrived.
The Brigade was called at 1547 and the fire was under control at 1801. Fire crews from North Kensington, Kensington and Paddington fire stations attended the scene.
The cause of the fire is believed to be heat from the gas fire igniting combustible materials.