Four fire engines and around 25 firefighters tackled a fire at an outbuilding on Durban Road in Walthamstow.
Part of the lower ground floor of the two storey building was damaged by the fire. There were no reports of any injuries.
The Brigade was called at 0816 and the incident was over for firefighters at 0933. Firefighters from Walthamstow and Tottenham fire stations attended the scene.
The cause of the fire is under investigation.