Four fire engines and around 25 firefighters were called to a flat fire on Carlton Vale in Queen’s Park.
Part of an electrical intake cupboard on the ground floor of the building and a switchboard were damaged by fire. There were no reports of any injuries.
Leading Firefighter Sean Sloan, who was at the scene, said: “Crews attended after water from a flat on the ninth floor of the building made its way down to an electrical intake cupboard on the ground floor, which caused a small fire.
“There was quite a lot of smoke coming from the cupboard and properties from the eight floor down to the ground floor were damaged by the water leak.
“Around 40 people left the building before the Brigade arrived and were rehoused by the local authority.”
The Brigade was called at 1943 and the fire was under control by 0008. Fire crews from Paddington, West Hampstead and North Kensington fire stations attended the scene.
The fire was caused by an electrical event after water entered an electrical intake cupboard.