Former Casting House and Workshop at Treforest Tinplate Works

Comprising 2 single-storey ranges placed end to end and now joined by a C20 link. Both are of rubble stone and having round-headed openings with stone dressings to the E elevation and brick elsewhere. The S range has a slate roof, now mostly missing, the N range an asbestos-cement roof.

The S range is lower. Its S gable end has a doorway flanked by windows, and with 3 stepped bullseye vents in the gable, all now blocked. The E wall has 2 tall doorways flanked by pairs of windows. The W side wall is similar but between the windows are bullseye vents. The N gable end has 3 bullseye vents. A central round-headed doorway has been altered by inserting a lintel below the head, and has a window inserted immediately upper R of it. Round headed outer windows have been cut down to make doorways. A corrugated C20 link is between the 2 ranges.

The S gable end of the N range has been demolished. The E wall has a central round-headed doorway with dated keystone, to the L and R of which are lower doors flanked by windows, all with stressed keys and imposts and the windows with stone sills. The N gable end has a doorway flanked by windows and 3 bullseye vents, all blocked. On the W side is an added continuous lean-to, which has blocked segmental windows and an inserted wide doorway. The eaves have been heightened in brick. A blocked doorway is in the N end and an inserted doorway in the S end wall.

Both ranges have wrought iron roof trusses. The original W wall of the N range has 3 wide doorways flanked by 4 narrower and lower doorways.