Former Plas Power Colliery Western Winding Engine House

The western winding engine house is of red brick with a hipped roof and four bays long by two bays wide. The windows are tall and round-headed with brick arches and stone sills. No window frames remain except a few fragments which show the windows to have had small-paned metal frames with radially and concentrically glazed fanlights. On the N elevation are two large and two small openings related to winding cables and engine man's viewing lines. There is a continuous deeply corbelled eaves cornice. The timber roof (slates now missing) has a small dormer on its N slope for one end of the winding cable to pass through, and further low dormers for ventilation on other faces.

The vast stone engine bases rise to the main floor level, with pits and a semi-basement around them. Several large timber beams lie across the engine beds.