Pentre-celyn Hall

Pentre-celyn Hall is a large, two-story villa dating from the 18th century, constructed primarily of local limestone ashlar masonry, with the rear wing being an exception. The architectural style is Gothic. The roof is steeply pitched and covered in slate, with coped gables. The chimneys are notable for being separate, square, and diagonal.

The north-west facing front elevation is symmetrical, featuring a central main entrance and oriel window, flanked by two projecting gabled bays and a three-arch porch that further advances the facade. A string course defines the first floor, but does not return at the sides. The gables have copings with kneelers and finials, and the porch features a flat coped parapet with a raised central section displaying a shield, which appears blank. Each gabled bay has a twelve-pane hornless sash window at the upper level, and a fifteen-pane window with similar, but unequal sashes below, all with hood moulds, while a shield is located at the apex of each gable.

The left side elevation, overlooking service yards, includes an advancing staircase bay with a tall window. A shield displaying a date and name is positioned at a high level. The right side (garden) elevation is divided into two units; the left unit has a large bay window with a flat roof and parapet, and a single window above. The right unit contains three windows above and below, with a central advancing gabled bay topped with an oriel. The rear elevation is dominated by a large, blank gable, with a projecting stack and single windows above and below.

The rear, T-shaped service wing is contemporary with the main house, but uses limestone rubble for the south-east and north-east sides, along with its chimney stack. It incorporates two modern rooflights and a modern dormer window, along with irregularly placed original hornless sash windows and one modern steel-casement window. Single-storey domestic offices, including a modern garage, surround a service yard.

The interior layout is based on a large, central hall with a main staircase serving the ground and first floors only, to the left. The front left room serves as a dining room, while the right room functions as a drawing room. The kitchen is located to the rear of the stairs and connects to the service rooms in the north-east wing. A second staircase serves all floors from the cellar to the attic, branching off the kitchen, and there is also a separate staircase to the cellar from the front of the house. The cellar contains several brick-vaulted spaces; the original entrance from the service wing has been walled up.

The main reception rooms feature boldly moulded cornices and boxed shutters to most windows. Figured marble fireplaces are present throughout. The main staircase is constructed from hardwood, with a swept handrail ending in a coil above the curtail steps and bracketted treads. A more utilitarian servants' staircase is located off the kitchen.

Notable interior details include built-in Gothic style bookcases in the dining room, a swag frieze below the cornice in the drawing room, a plaster centre leaf feature for light hanging, and a revealed slate flag floor in the kitchen.