Plas Newydd

Plas Newydd is a large house, dating from the 18th century and displaying a Gothick character, with substantial later alterations. The two-storey, four-window front is faced in cement render and heavily embellished with applied timberwork, including a band of urns approximately three-quarters of the way up the facade. The slate roof is edged with freestone gable parapets and kneelers, and features stone chimney stacks, paired at the left end.

The three main bays to the left feature deep, splayed bays to the first floor, framing a smaller bay over the entrance. Diamond leaded glazing and some stained glass are present. The front is further characterised by a pitched roof with a three-arched Gothic canopy below, and a band of carved panels at lintel level. Two-light windows are set within heavily embellished surrounds. The central canopy forms a splayed porch with built-in seats. The right-hand bay contains a two-light pointed window connected by carving to the small-paned library window and a doorway, both with bracket pediments. Timberwork extends to the gable ends; the left end features a tabernacle above carvings depicting religious figures, with pediments over a ground floor window and a dummy doorway. Two small dormers are visible at the rear, alongside a central staircase window with openings to each level. A pointed cellar doorway is situated to the right. An advanced and splayed bay with Gothic windows containing intersecting tracery extends from the left end.

The entrancework features a narrow design with an openwork carved balustrade and animal carvings on the handrail. The woodwork detailing is extensive, largely applied to doors, doorcases, chimney pieces, cornices, and incorporating reused Jacobean elements. Many ceilings are of ribbed plaster. The "Oak Room," originally the kitchen and later a drawing room, retains a fireplace inscription marking a visit by the Duke of Wellington. This room, along with the adjoining Ante Room, has Spanish leather wall hangings introduced by General Yorke. The Ante Room exhibits a fragment of medieval glass in its front window and a pointed arched doorway with a coloured prismatic lantern. The taller library at the right end has a ribbed ceiling with bosses and further fragments of medieval glass, originating from Valle Crucis. The State Bedchamber—used as a guest room—has an early egg-and-dart cornice and stout barley twist columns to the chimney piece.