Pen Twyn

Pen Twyn is a farmhouse that likely dates from the late 17th century to the 18th century. It is constructed of rubble with a stone slate roof and features end stacks. The building has a two-room plan and stands two storeys high, with two windows on the front. The windows are regularly spaced and consist of 3-light 19th-century timber casements, with one to the left of the door and another to the right. There is a 2-light contemporary casement above the right-hand window on the first floor, and a 2-light 18th-century leaded casement above the left-hand window.

The central entrance is located under a gabled rubble porch and features a moulded door frame with an 18th-century ledged door. The left-hand gable has been raised and includes a small casement under a dripstone, while the rear wall has a 3-light chamfered mullioned window.

Inside, there is a plank and muntin screen with a ledged door. The left-hand room has a central beam with double ovolo moulding extending from the front to the back wall, and a cast-iron range on the end wall. The right-hand room features two longitudinal chamfered beams, an oak window seat in a deeply splayed window opening to the front, and a moulded stone fireplace with a dropped keystone dated "1789" on the end wall. A rubble stone newel stair to the left of the fireplace is lit by two small oak-framed lights positioned about one third and two thirds up the flight.

The upper right-hand room has a cast-iron fireplace from around 1870, while the upper left-hand cell is divided longitudinally into two small rooms. At the rear of the right-hand ground floor room, there is a local type half-truss extension, likely a pantry, accessed by a ledged door from the main room. The left end wall of the extension features a 4-light diamond section oak mullioned window with three main mullions and formerly four smaller diamond mullions.