Pen-Rhiw

Pen-Rhiw is a building designed in the Tudorbethan style, constructed from squared rubble stone with limestone ashlar dressings. It features steep slate roofs with bargeboards, terracotta ridge tiles, and tall stone chimneys. The structure is two and a half storeys tall and has an L-shaped plan, with prominent gabled features on either side of the southwest angle. The exterior includes ashlar quoins and mullion-and-transom windows on the main floors, along with mullion windows in the two attic gables. Dripmoulds adorn the principal windows, and there is a moulded string course on the eastern front and around the gable on the southern front. The building stands on a raised chamfered plinth.

On the eastern front, there are three-light windows on both main floors and two-light windows in the attic of the gable projection to the right. The lower wing to the left features two two-light windows above and one three-light window below, along with a large half-timbered and glazed gabled porch at the angle by the gable. The porch includes stained glass sidelights, a stone base, and an ashlar-framed pointed-arched doorway with a plank door. The northern end wall has a blocked ground floor window, a two-light window above, and two small lights in the attic.

The southern front has a large projecting gable to the left, featuring four-light windows on the front and single-light windows on the sides of the main floors, with a two-light window in the attic. The wing to the right is tall and includes a long mullion and transom stair light, with a single light above it, breaking the eaves. The ground floor has a four-light window under a single light and a two-light window, which do not have dripmoulds. There is also a large 20th-century gabled dormer. The eastern end has paired gables, with the larger main gable on the left featuring two-light windows on each floor, while the smaller gable has a four-light window on the ground floor, a two-light window above, and narrow paired vents in the attic.

Inside, the inner door has stained glass panels on each side. The stair hall features a moulded Gothic arch, as does the stair, which is a moulded and carved pine dog-leg stair. The building has six-panel doors. In the southwest and southeast principal ground floor rooms, there are stone Gothic fireplaces adorned with fine tiles by William de Morgan.