Former Plas power Colliery Eastern winding Engine House

The building is of rectangular plan four bays by three, and built of dressed sandstone with red brick dressings. It formerly had a hipped slate roof, but was roofless at the time of inspection. The windows are Romanesque style with round-heads and deep concentrically corbelled arch-rings and surrounds. There are massive sandstone sills. Remnants of metal window frames are small-paned with concentrically and radially glazed fanlights. The S elevation, formerly facing the colliery chimney, has three windows at main floor level, one larger and central, and two smaller ones placed higher on either side. Below these are two windows and a doorway with segmental heads to the semi-basement level. The W and E elevations have evenly spaced windows at main floor level, appearing high on the E side where the ground level is much lower on the former site of the ten steam boilers which supplied the colliery engines. The N elevation, towards the pit head, has large windows for the winding cable and sight lines. There is a continuous moulded eaves cornice.

The massive stone engine bases stand high above the surrounding service area and semi-basement. Some large baulks of timber lie at floor level, and part of one roof truss is still in position. A rendered dado runs around the main floor level.