Abergwenlais Mill

Abergwenlais Mill is a building that includes a house and outbuildings, constructed from whitewashed rubble stone with slate roofs. It features three ranges that are arranged in a roughly L-shaped plan. The two-storey house is located at the northern end, while the taller mill is positioned at an angle to the left, with outbuildings extending to the east.

The mill has a hipped roof and heavy cornerstones. On the ground floor to the right, there is a broad cart-entry with a cambered head and stone voussoirs. To the first floor right, there is a large pair of casement windows with a timber lintel. The left side of the mill is obscured by a two-storey lean-to that has a similar large casement pair on its northern side. The southern and western sides are constructed of rubble stone, with the southern side featuring a pair of casement windows on both the first and second floors, one of which has a brick jamb. The ground floor opening on this side is blocked and has stone voussoirs. A water-wheel was located on this side. There is a straight joint to the lean-to. The western rear side has a cambered arched ground floor cart-entry to the left, two blocked openings, and a former door that has been converted into a casement pair to the right of centre, along with another casement pair on the second floor to the left.

Inside the mill, the ground floor contains three heavy beams, while the first floor has pine beams. The roof features fine trusses made of arch-braced collar trusses with diagonal struts above the collar, and the joints are bolted. In the roof space, there is a massive timber horizontal shaft for a hoist. The barn has a later 19th-century roof with stapled collars and consists of four bays.