Three crews were sent to the scene, between Ecclesall Road and Abbeydale Road, shortly before 4am, as flames were spotted in the roof.
A spokesman for South Yorkshire fire service said: “Three fire crews from Central and Lowedges stations were called out to a premise on Carter Knowle Road, Sheffield at 3.45am. The accidental fire was in the roof area. Firefighters left the scene at 5.50am.