Pen y Bryn Farmhouse and attached Byre

Pen y Bryn Farmhouse and attached byre is a building of mixed dates, likely originating in the 18th century and significantly altered in the 19th century and later. The house is constructed of rubble, with roughcast render on the main house and decaying lime and colour-wash on the barn section. The original roof covering was likely thatch, but it has been replaced with slate.

The house follows a lobby-entry plan and features a plain rendered central stack. Originally, the facade was symmetrical, centered on a recessed entrance. A late 19th-century doorcase with stop-chamfered details frames a modern, part-glazed door. Flanking this are 12-pane casement windows on the ground and first floors, the first-floor windows formed as gabled dormers. A sliding sash window is located to the right of the entrance on the ground floor. External boarded shutters are fitted to the ground-floor windows, except for the sliding sash to the right. A stone-walled enclosure sits in front of the house, returning to a later wing to the right.

To the left of the house is a three-bay agricultural section. This section has largely been rebuilt, probably in the late 18th century, and showcases king post trusses. It has a kneelered and parapetted gable to the left. Ventilation slits, originally in two tiers, are now blocked. A central entrance, stepped up and with a cambered head featuring sandstone voussoirs, leads to a plain stable door. Flanking this under the eaves are two window openings, one near-flush with a cross-window and the other with plain boarded shuttering. To the right is an inserted 19th-century entrance with a cambered brick head and recessed boarded door. A further boarded door with ventilation slits is situated to the left, near the gable end. A corresponding central entrance is present at the rear.

Adjoining the byre to the left is a late 18th-century gabled extension constructed of rough-dressed sandstone under a slate roof, with kneelers. It features a segmental-headed entrance with a recessed, contemporary boarded door and a segmental-headed, unglazed light to the right. The left gable face has an upper shuttered window and ventilation slits, mirroring the earlier sections. A similar gabled extension is located to the rear of the byre. Behind the house are two later service wings, gabled and roofed to match the rest of the property. They have modern fenestration.

A two-window, two-storey early 19th-century domestic addition is stepped up and adjoins the house to the right. Built of rendered rubble with a slate roof, it features a plain rendered chimney to the right. The left-hand entrance has a recessed boarded door and a plain triple-light fan above, with a flat-arched, tooled lintel. To the right is a later tripartite 24-pane flush casement window, with the central section fixed and a matching lintel. Two first-floor 12-pane near-flush casement windows also feature these lintels. A contemporary single-storey rear projection extends from this wing.

Inside the main house, the ground floor rooms have heavily beamed ceilings with stopped and chamfered details. A large inglenook contains a simply-moulded, segmentally-arched bressumer with a later 18th-century bracketed mantle-shelf. A plain early 19th-century staircase has stick balusters and a swept rail. The 19th-century wing has contemporary shuttering to its windows and 5-panelled doors.