Perth-eiryn

Perth-eiryn is a two-storey building with an attic and cellar, featuring a timber frame and a slate roof. The west front is made of brick, with some timber framing painted on the brickwork and corrugated iron. The main layout includes a hall and parlour with a gable stack, alongside a rear wing that forms a 'T'-plan and likely dates from the same period, which contains the current staircase. The framing is closely studded throughout, and the south gable end jetties at the gable level, supported by tension braces. The west front is constructed in Flemish bond brick, comprising five bays, with a brick plat band and end pilasters, as well as additional brick pilasters flanking the central bay that contains the entrance to the former hall.

The original smaller five-bay windows were replaced in the early 19th century with two- and three-light transomed timber windows featuring segmental heads, iron casements, and small panes. Above the central glazed doors, there is a section of timber inscribed with the date 1654. The brick stacks have been rebuilt. The south front has sash windows, while the sides feature oak cross windows.

Inside, the hall and parlour range includes twin chamfered spine beams and gable stacks, with alterations made around 1960 when one fire beam was removed and reused in the dining room of Plas Dinam, Llandinam. Some panelling has been reset over the former hall fireplace, and there are 18th-century panelled doors. A staircase from around 1900, with splat balusters, likely replaces the original staircase in the back wing, which also has an end service room with a cellar underneath.