Banc-Y-Gwin is situated down-the-slope, its front facing south-east, on a spur of the hill at 400ft OD.
It is a traditional stone-built, early C18th, former long-house, consisting of a 1? storey, thatched farmhouse of end-chimney, central-entry plan, and 5-door cow-house. It has a blocked hearth gable-end-entry and the upper gable-end's line of a lower roof, indicates that it is a former sub-medieval long-house structure that has been re-built in the mid-late C18th and altered in the mid-late C19th. The slightly wider, opposed entries in the cow-house appear to have formed the original cross-passage entry.
A detached range of mid-late C19th stone-built & slate-roofed farm buildings with brick voussoirs to openings are situated to east, consisting of lofted stable (gable-end loft doorway), double cart-house (granary over) & 3-bay barn with opposed central threshing doorways. A former water wheel was probably sited at the lower gable-end, fed by a water-leet approaching, from the east field.

Visited Geoff Ward & Y Alagul, 05/02/2003.