Tregoyd Mill House

Tregoyd Mill House is a two-storey building constructed of rubble stonework, which is colourwashed at the front and topped with a slate roof. It features an overshot wheel at the west end and a lean-to porch at the east end. The timber windows date from around 1965. Water was piped to a delivery cistern at a high level by Maund of Brecon, flowing over the iron wheel with curved buckets and draining through an underground culvert to a ditch on the north side of the mill.

Inside, there is a back-to-back stack located between the first and second bays, with a newel stair behind the stack that is accessed from the added first bay. A heavy timber lintel spans the original gable fireplace in the second bay. The third bay, separated by a timber screen, houses the remaining mid-19th century machinery, which includes a fruitwood-cogged iron pit wheel that engages an iron wallower on a multi-faceted vertical shaft, driving two underdrift stones through iron stone nuts. Adjacent to the machinery is a mill stair leading to the upper floor, which contains one pair of French burrs in position, while another pair made of quartzite remains on site. Additionally, there is timber tentering gear, remnants of sack hoist machinery, and parts of a belt drive for a boulter.