Plas Cwmcynfelin

Plas Cwmcynfelin is a medium-sized country house, likely dating to the 18th century. It is constructed of local Silurian shale rubble stone, without quoining, and has slated, low-pitched hipped roofs. The main, five-window facade is double-pile, with a slightly recessed central section and shallow-pitched roofs terminating in painted corniced ashlar parapets. There are two stone stacks at the west end, but no chimneys at the east end. The south front, which is the main entrance front, is two storeys high, while the rear, north front rises to three storeys. Windows throughout have stone voussoirs to flat heads and painted slate sills. The south front has a five-bay arrangement, with plastic windows replacing original 12-pane sashes, except for a large French window on the ground floor right, which also replaced a sash. A white-painted Classical porch with square columns and an entablature sits centrally, leading to a wide six-panel door with four glazed panels and two fielded panels. A basement is present with 20th-century timber windows. The east gable end features a three-storey, three-window range with two blank windows with painted glazing bars to the first floor, and a 12-pane sash and a casement pair to the second floor. Plinth and sill bands, originating on the south front ground floor, continue underneath the first floor on both the north and south fronts. The north elevation mirrors the south in detail, with replacement plastic sashes in earlier openings, except for 20th-century timber windows on the ground floor. Paired string courses mark the first floor. A central porch, with square piers and an entablature, has glazed sides and a half-glazed door.

A west-end crosswing is also hipped, dated 1875 on a north-side downpipe, although it may be earlier 19th century. It is two storeys high at the south end, with a single window; the west front has five windows, rising to a three-storey, two-window arrangement on the north end, where the height falls with the ground slope. The north side features an arched ground floor door and a corbelled chimney breast central to the first and second floors, with plastic 12-pane windows on each side of both floors. The west facade has a central arched ground floor door with an arched window to the left. The upper floors have tripartite sashes in the two bays to the left, sashes in the two bays to the right, and a central window altered for a fire escape. The south end has a late 19th-century timber oriel window to the ground floor, with a corniced roof and small-paned top-lights. Above this is a small pair of four-pane sashes. A truncated chimney is visible to the first floor right.

Much original internal detail remains. A fine entrance hall features a moulded cornice, dado, and tall skirting-boards. Doors are mainly six-panel with wide architraves. An open stairwell rises over the entrance, with an open-string, stick-baluster stair to the right. A central corridor extends to the left.