Cefn Cribwr ironworks, the furnace and charging house

The Cefn Cribwr ironworks includes a furnace and charging house, built from local sandstone. The furnace measures 9.75 meters square at the base and tapers to 6.1 meters square at the top, originally featuring a short circular chimney that reached a total height of 10.6 meters. Each of the four sides has tapered arches, with the tapping arch constructed using finely laid voussoirs, which may have been added later. This arch leads back to the drawing aperture that connects to the tapered square crucible of the furnace. The upper part of the furnace is circular and bottle-shaped, narrowing towards the top. The area beneath each arch is paved with a stone and brick apron, featuring a curved front and a central slot for the main drawing channel that leads into the casting house. Foundations remain on the east and west sides. Behind the furnace, there is a narrow passage that is bridged over, with a recess in the retaining wall beneath the charging house. The upper part of the furnace, including the charging level, has been lost.

The lower storey of the charging house still stands, consisting of one large chamber that is now roofless and has an angled opening to the furnace. Behind this chamber are two narrower rooms, which have openings with splayed reveals that have been altered in brickwork.