Cwm Bychan

Cwm Bychan is a two-story house with a single-story service wing to the rear and a single-pitched stable addition to the northeast. The house was built using coursed boulder construction, incorporating large stones at the base of the walls, with stone lintels and sills. The roof is covered with small slates, featuring stone copings and square gable stacks with dripstones and caps. The main part of the house has a three-window front facing southeast. The ground floor has nine-pane horned sash windows on either side of a wide doorway that now contains a replacement boarded door with long, tulip-headed hinges. The first-floor windows are small four-pane casements set under the eaves. A similar first-floor window is present in the southwest gable return, and at the rear, there’s a six-pane ground-floor window with a small, shallow three-pane light above, offset to the northeast end of the range.

The single-story service wing at the rear is constructed in a similar style and has a tall gable stack where it joins the rear addition. The main part of the service wing has a recessed stable door on the left (southeast) end of the northeast wall, while the opposite wall features a six-pane casement window to the left and a small four-pane fixed light to the right. The addition beyond has a boarded door at the right (northwest) end of the northeast wall and a narrow fixed light in the northwest gable apex.

The single-pitched stable addition at the northeast gable has a centrally positioned boarded door with a ventilation slit to the left along the northeast wall, and a large twenty-pane light in the right (northwest) return.

The original layout of the house, comprising a hall, cross-passage, and two service rooms, was modified over time to create a parlour, then a single large room. However, the framed ceilings of the original rooms remain, and the stone chimney stair adjacent to the former hall fireplace is still present. Massive, hewn, chamfered bressumers are visible to the fireplaces at both ends, with one in the former parlour dated 1770 and inscribed "L LL.” The first floor features three collar trusses; one is grooved for a partition, indicating the original layout was of two rooms. Wall panelling in one room is described as a replica of earlier panelling, replaced in the late 20th century.