Bwlch Farmhouse, including attached farm range

Bwlch Farmhouse is a two-storey house dating from the medieval period, with later alterations and additions, including an attached farm range. The house is constructed of whitened rubble-stone walls with a slate roof, featuring a brick stack to the right of centre and a gable stack to the right. It faces south and originally had a four-window front, though the casement windows are replacements within earlier 20th-century openings. A replaced door is located to the right of centre, within a lean-to conservatory. A vertical joint is visible to the left, marking a separation between the main house and a 19th-century addition featuring a replaced glazed door and a gabled dormer.

Attached to the left gable end is a lower, altered, L-shaped farm range, partially converted for domestic use. This range incorporates a cow house built of rubble stone with a corrugated-iron roof and four boarded doors. The rear of the house, also featuring four windows, has openings similar to those on the front. A replaced back door is located to the left of a 19th-century lean-to back kitchen, which is depicted on the 1889 Ordnance Survey. Further to the right is the 19th-century addition, with an inserted door and window, and a window above set within a gablet.

The internal structure of the medieval house remains largely intact. Four cruck trusses are still in place. The central truss of the original open hall has a collar and raking struts, now infilled with plaster. The house’s current lobby-entry plan resulted from alterations around 1600, when it was converted to a two-storey dwelling. The hall to the left of the entrance features a fireplace with a timber lintel carved with a high-quality design, likely reused as dendrochronology indicates the timber was felled between 1509 and 1554. The medieval iconography on the lintel, divided into three elongated triangular panels, includes an unfinished Green Man, an amphisbaena, and a Tudor rose, which is an unusual motif for a domestic setting. At the right end of the hall is an original cupboard with a later door. The hall also has two spine beams with run-out stops. In the passage behind the fireplace, to the right of the entrance, is a box-framed partition leading to an end room, which includes a fireplace with a replaced lintel and a joist-beam ceiling, partly replaced, also with run-out stops. A partition with thinner wooden posts separates the hall from the original parlour.