Pen-y-Bryn Farmhouse & attached Agricultural Range

Pen-y-Bryn Farmhouse is a largely 18th-century farmhouse with an attached agricultural range. The farmhouse is constructed of rubble with slate slab gable ends that continue around the building as quoins, and has a slate roof. It features rectangular end chimneys, rebuilt in the 19th century. The upper floor has four windows close to the eaves, all with varied proportions and 2 or 3 light casement glazing. The ground floor has a doorway with a chamfered, 3-centred, monolithic arched ('Cyclopean') head of slate with a segmental rerearch. A broad window sits to the left of the door, and two smaller windows to the right. All windows have 19th-century type casement glazing and were probably deepened in the 19th century. The rear elevation shows a former doorway that has been blocked to make a window; to the right is a square window with a simple stone lintel, and a broad blocked window with a heavy stone lintel. The first floor has two casement windows. A gable end facing a barn has casement windows to each floor on the left, under simple stone lintels.

Attached to the rear of the house at a right angle is an agricultural range, mainly of the 19th century, but incorporating altered 17th-century stables. A lofted stable is built to a similar standard as the barn. It features flat slab masonry, a central doorway with a shaped stone lintel flanked by square windows under stone lintels, and upper windows set at the eaves. At the rear, where the ground is higher, there is a loft doorway set at eaves. The interior of the stables has a ceiling with two old transverse beams but later joists. To the left, stables extend in line to connect with the house, featuring two windows set at the eaves and two broad openings under deep lintels (with some brick infill to the left opening). Further extensions extend in line to the right, at a lower level, with a square-headed doorway and a square window on each side.

The farmhouse interior was re-ordered in the 19th century but retains a 17th-century ground floor ceiling of six bays, with stop-chamfered beams and joists (some replacement joists, especially in the southwest bay). A wide fireplace is located at the right end with a cambered segmental arch of stone voussoirs, while a fireplace at the left (southwest) end was likely a later insertion. Timber stairs replace original stone steps, which were once to the right of the northeast fireplace. Upstairs, original heavily-built timber-framed and plaster-panelled partitions remain, one with a blocked pointed-headed doorway. The roof comprises four small queen posts between collar and tie, with raking braces above the collar. The south truss has no tie-beam, but instead small arch-braces. It's known that the room beneath this truss previously had a coved plaster ceiling (some lath and plaster remains above the ceiling).