Plas Gelliwig

Plas Gelliwig is a two-storey mansion, largely of the 19th century, though incorporating an earlier core to the west. The house comprises an entrance range to the north, with a 19th-century cross wing to the south, which itself has a late 19th-century L-plan subsidiary wing. The building is constructed of coursed rubble stone with slate roofs throughout.

The west elevation of the entrance range features a central entrance with a six-panel door; the bottom two panels are flush and the top is glazed with a rectangular overlight. Two deep four-pane plate glass sash windows flank the entrance on either side. The first floor has four corresponding smaller nine-pane sashes, with stone lintels and shallow stone sills. A moulded string course runs to the eaves parapet, with a stack to the left-hand gable and paired octagonal shafts to an axial stack. The north gable return has a stone lean-to addition with a brick stack and a six-pane sash window to the ground floor. The rear (east) elevation is symmetrical with four nine-pane sashes on the first floor and corresponding twelve-pane sashes below. To the right, a two-storey lean-to has a half-glazed door with a two-pane window to one side. Above it is a stone two-light mullioned and transomed window.

The south wing was added in the late 19th century in a Gothic style, with a three-window range featuring mullions and transoms. A Tudor-arched entrance is positioned to the right, with a window above it projecting on corbels. A full-height shallow canted bay is located to the left. The west gable return has stone chimney stacks incorporated as buttresses at the corners (one with an octagonal flue) and a larger stack in the middle, rising in three recessed tiers, each with raking offsets and a plain rectangular stone cap. The east gable return is set back behind a row of three picturesquely decayed cambered stone arches. Other features include crow-stepped parapets and an attached two-storey battlemented turret, alongside a large rectangular chimney stack with offsets flanked by a one-light and a two-light mullion and transomed window.

To the southeast is another L-plan range; its south wall has stepped gable parapets with a centre stone stack. In the west wall is a carved stone tablet depicting a key above a windmill and dated 1731, bearing the initials ME. The fenestration here is irregular, including a two-light mullion on the first floor and a three-light mullion below. The east portion of this range has dormer windows to the first floor and a lean-to on the ground floor, incorporating metal casement windows with hexagonal-paned glazing.

The earlier portion of the west wing has very thick walls with splayed window reveals and 18th-century door architraves. Inside, the stair has a plain open string, balusters, and a mahogany rail. The drawing room to the east has moulded ceiling cornices. An attractive Moorish-style lobby is located on the first floor, with a domed octagonal skylight. The south wing has four-panel doors with Gothic traceried upper panels. A row of 14 servants' bells is located in the kitchen. The property also includes a cellar.