Former engine manufacturing building at former Neath Abbey Ironworks

This is a former engine manufacturing building, part of the former Neath Abbey Ironworks. The building, likely dating from the 18th and 19th centuries, is constructed of rubble stone with some dressed sandstone. It has a roughly L-shaped plan with three ranges. The original range, located to the north, has lost almost its entire front wall, although a short section remains showing windows that originally had cambered heads with stone voussoirs and keystones. The end wall suggests the presence of a third or attic floor, with two first-floor windows and one centrally located below, similar to the front wall. To the left are remnants of sills and parts of the jambs of two windows above. The right side features a broad cart-entry arch and a larger opening above, both with stone voussoirs, and both now blocked. The rear wall of this range has eight bays with cambered-headed windows, again with sandstone voussoirs and keystones, and is largely blocked in red brick. A step is visible in the wall above the first floor.

The added range, to the south, has a higher-quality front wall of squared and dressed sandstone, featuring six broad, elliptical arched entries and nine cambered-headed windows above. An impost band runs along the ground floor, and there are remnants of cast-iron glazing. The rear of this range is similar to the earlier section to the left, with cambered-headed openings featuring stone voussoirs, and remnants of cast-iron, small-paned windows. There are doors in the sixth bay of the first floor and in the first and sixth bays of the ground floor, the last incorporating a very low doorhead. The rear elevation has a row of iron brackets that once supported a channel for a water-wheel, running across both ranges.

Attached to the south is a further added range, significantly altered, which includes a blocked very broad arch with stone voussoirs between two blocked roundels, partially obscured by buttresses. The wall then steps down over a brick-arched entry leading to a modern garage.

Against the back of the front wall of the original range are seven cast-iron piers that formerly supported an axial beam. In the rear left corner of this range, a masonry indent contains a cast-iron beam built into the wall and extending to another cast-iron pier. The piers have a tapered T-plan with thickened heads. Within the garage to the south is a long wall with a large stone voussoir arch and a door, both also with stone voussoirs.