Four fire engines and around 25 firefighters attended a fire at a dry cleaners on Essex Road in Islington.
Part of the ground floor of the shop was damaged by the fire. There were no reports of any injuries.
The fire was discovered by a passing bus driver who noticed the smoke emitting from the roller shutter that secured the shop and called the Brigade.
The Brigade was called at 0149 and the fire was under control by 0312. Fire crews from Islington, Shoreditch, Stoke Newington and Holloway fire stations were at the scene.
The cause of the fire is under investigation.