Rhyd-y-Gwydd is a single storey longhouse type cottage, photographs in the National Monuments Record, taken around 1985 show the building with a corrugated roof.
RCAHMW 2008

Rhydygwydd  is a late 17th or early 18th century house, originally probably 2-unit with hearth passage at the downhill end, and probably an example of an outside cross-passage house, in which the chimney backs onto the original entry.

The house was extended at both ends in the 18th or 19th century. The farmstead is marked on the 1838 Llandeilo Fawr Tithe survey as part of the Taliaris Estate. In the 19th century the second entrance and the dormers were added and in the third quarter of the 20th century the windows were enlarged, the outer walls were encased in a blockwork skin, concealed behind a smooth render, and the ground floor and interior walls were also cement rendered.

The hall retains cross beams and a fireplace with a timber lintel. The original inner room is divided into 2 small rooms which have boarded doors, and a simple steep 19th century ladder stair, concealed behind a boarded partition. The parlour at the uphill end has a 19th century wooden fireplace surround. The kitchen has a fireplace with cambered brick head, and in the corner of the room a steep ladder stair concealed behind a later boarded partition.

Rhydygwydd has been listed, notwithstanding some modern alterations, as a rare surviving example of a pre-1800 vernacular upland Carmarthenshire farmhouse, retaining characteristic form with its low walls and steep roof, and retention of its ground-floor plan.

Reference: Cadw listing description, 2020