Blaentrothy Farmhouse and attached Farm Buildings

Blaentrothy Farmhouse is a 17th-century farmhouse constructed from red sandstone rubble with a slate roof and projecting stone chimney stacks featuring brick flues. The building is two storeys high with an attic. The east front has a ground floor that includes an off-centre 20th-century stone entrance porch with a monopitch slate roof and a boarded door. On either side of the entrance are broad 20th-century casement windows with three panes each, complete with dripstones and timber lintels. The first floor features three windows with shallow timber lintels; to the right are two 18th-century casement windows with three panes each, and to the left is a 20th-century two-light casement window.

Attached to the south gable of the farmhouse is a single-storey farm range made of rubble stone with a corrugated metal roof. The section closest to the house is timber framed and clad with horizontal boarding, while the lower end has stone walls with two entrance doorways. On the north gable of the farmhouse is a two-storey granary, also built of rubble stone with a corrugated metal roof. The first floor has a boarded doorway and a square blocked opening to the right, accessed by a 20th-century cast-iron spiral staircase.

The unusual roof truss at Blaentrothy Farmhouse allows for a central doorway to be cut through the principal tie beam, providing greater headroom in the habitable attic. The sturdy vertical posts of the door frame are secured by being tenoned into the soffit of the collar above and the top of the ceiling beam of the bedroom below. The inner ends of the cut-through tie beam are also tenoned into the sides of these posts, effectively using the door posts as a tie. The ground floor plan consists of two rooms: a living room on the left and a smaller parlour on the right. The ceiling beams are noted to have roll-and-step mouldings and scroll stops.