Crews from Aston, Maltby, Doncaster, Central and Parkway were called to an incident in an industrial building on Outgang Road in Dinnington at 12:24pm on 17 April.
Firefighters arrived on scene following reports of smoke in the area and flames coming from the single storey building.
All persons have been safely evacuated from the building. Three appliances remain on scene.
The cause of the fire is not yet known but a multi-agency investigation will take place once crews have left the scene.