T-plan agricultural range at Gelli-Dywyll Farm (also known as Cwmgelli Farm)

A large agricultural building comprising a lofted former cow house and stable in the main range oriented N-S, and a barn in the rear wing on the E side, giving a T-shaped plan. Of coursed rubble stone, retaining traces of limewash to the N-S range, and corrugated iron roof. Facing the farmhouse to the W, the openings have wedge stone lintels. At the uphill (N) end the former cow house has 3 original doorways of which the central has a replaced boarded door while the outer have been replaced by metal-framed windows. Flanking the outer doorways are ventilation strips, with further strips to the loft and stone steps at the L end. Further R, at the downhill end, the stable has boarded doors with metal-framed windows to the L side of each doorway, and 2 small loft windows beneath the eaves. The uphill gable end has a loft doorway, while both uphill and downhill gable ends have small round pigeon-loft openings beneath the apex. The downhill gable end has an added lean-to incorporating a kennel. To the rear (E) of the stable are external steps to a boarded door, to the R and L of which are small stable windows. The rear of the cow house has an added outshut.

The barn has its threshing bay offset to the E side, with one tall ventilation strip to the E side and 2 to its W side. The entrance, on the N side, has a full-height opening. On the S (downhill) the exit doorway has a shallow segmental head with voussoirs and retains wooden brackets of a former canopy. The E gable end has ventilation strips and a small round opening beneath the apex to a pigeon loft.

Pegged collar-and-tie-beam trusses to roof; chamfered beams (upper level formerly lofted); lower level lofted, sawn joists.