Dyffryn Mymbyr

Storeyed house of rubble on a part-boulder plinth, notable for the exceptional length of its quoin-stones; the original render is lost and the masonry is heavily pointed in cement. Renewed small-slate roof with rubble gable parapets and squat C19 end chimney to the R; plain capping and weather-coursing. 2-window front with off-centre (L) entrance. This has an original cyclopean lintel with Tudor-arched opening; 12-pane sliding sashes in later openings to both floors, those to the first smaller and all modern replacements. Later catslide extension to the rear, now modernised; further modern sliding sashes. Three-part sliding sash to ground floor L gable.

Very wide fireplace to R (former hall) with massive flat bressummer. Crisp framed ceiling with deeply-chamfered cross-beams and stopped-chamfered joists, a few (to the L) replaced. There is mortising evidence for a former post-and-panel screen to L of entrance; this survives in part, re-located on the first floor. There is no visible evidence for an opposing entry (forming a cross-passage), though this was probably destroyed when the rear extension was put on. Modern stair to first floor. This has modern partitioning, though the trusses are visible; 3-bay with original pegged collars and queen struts. Post and panel partition to R bay, re-located, apparently from ground floor; ogee-headed doorway to centre.