Plas-yn-Cefn

The interior was not inspected at the time of survey (11/97), although an Ionic, Adam marble chimneypiece, originally from Wynnstay, is recorded.

Large irregular country house of local limestone rubble construction with tooled limesone dressings; slate roofs with plain chimneys and characteristic stepped, kneelered gable parapets. The NE (entrance) front has an advanced 2-storey, L-shaped section to the L, with a further section set back to the R and terminating in a cross-gabled service range. The former block has an advanced gabled part to the L with a cross-range set-back slightly to the R. Extruded in the angle between the two and projecting forwards slightly beyond the line of the gable is a c1900 single-storey gabled porch; this has a large Tudor arch with a modern glazed roof and screen doors. Within is an ex situ carved lintel beam (presumably formerly part of a post-and-panel screen), reused as the inner entrance lintel; this bears the carved date 1611 and the fragmentary motto 'Duw A Digon..' This range has large 15-pane sash windows to the ground floor with 9-pane sashes to the first floor; all have plain projecting and chamfered architraves of tooled limestone. The right-hand projecting cross-range has single 12-pane sashes to the ground and first floors of its front-facing gable. To the L is a link-block of 2 sections with crenellated parapet and flat roof; modern French window with steps leading up to it, and a 12-pane sash above.

The SE side has a central, gabled, projecting section with a 2-storey canted bay window; the timber-framed upper storey of this has paired and single 8-pane sash windows and deep eaves to its slate roof. The lower section has plain-glazed c1900 French windows. Flanking this are 2-storey wings of equal length with further 15-pane and 9-pane windows, as before, and an entrance to the far L; 4-panel door with plain overlight. Adjoining the L wing is a further projecting gabled wing, built as a small bathroom and WC range of c1900. This has 12-pane sash windows on 2 floors.

The rear (garden) elevation is roughcast and has a 3-storey, 5-bay main, primary section, set against the rock-cut slope of the hill into which the formal garden levels have been cut. The basement floor has three 16-pane C19 sash windows with two original (C18) 12-pane sashes to the R; the raised ground floor has the same arrangement in reverse, with the 3 original windows on the L; the second floor has four 12-pane windows with, to the far L an inset sandstone dedication plaque with carved cherubic head, latin inscription and the initials W LL A (for Lloyd). Four modern skylights to rear roof pitch. To the R of this main range are 2 small, lower sections, which project forwards into the garden at first-floor level; that to the L has a large rectangular, flat-roofed bay of c1900; this has a central 12-pane sash with 8-pane flanking and return sections. To the R is an entrance with part-glazed door.

The service range adjoining to the NW has a cobbled court to its NW side with a secondary entrance; this has a panelled door and tripartite overlight. Further 12-pane sash windows on 2 floors with, on the L, a stepped-gabled dormer to the roof. Adjoining this range at the N corner, and sweeping around in an arc to the front of the house, is a c1900 rubble screen wall with crenellated top; a Tudor-arched entrance with decorative wrought iron gate gives access from the entrance forecourt to the cobbled service court at the side.