Firefighters have been tackling a fire at a building on Coed Aben Road, Wrexham Industrial Estate.
They received a call just after 8:30 on Monday morning. Four fire engines and two aerial ladder platforms are attending the scene.
One ambulance was on standby on Monday and there are no reports of anyone inside the building.
People have been asked to keep away from the area and neighbours have been advised to keep doors and windows closed.