Plas Tan-yr-allt

Plas Tan-yr-allt

A late Georgian 2-storey villa, Grade II*, comprising a main house of near-square plan incorporating an older building at the rear, with a later wing and service building set back on the left (west) side. The building is constructed of blocks of quarried stone laid in regular courses, painted light blue.

The main house has a hipped slate roof on projecting eaves with a stone stack behind to the right. The 4-window front overlooks Tremadog, Traeth Mawr and Porthmadog. A lean-to veranda with slate roof on iron posts (mostly replacements) wraps around the sides. The central recessed door is half-glazed with Gothic glazing bars, beneath a fluted panel in place of a former overlight. On the left side is a late 19th-century added canted bay window with French doors. On the right side are French doors. The upper storey has 2-light casement windows.

The right (east) end wall features a similar canted bay window with French doors below a 2-light casement in the upper storey. The veranda is infilled with a boarded and glazed screen on the left side. Further right is the gable end of the earlier building, which has lower eaves than the main house. It has an added lean-to in the lower storey with a wide 4-light window and half-glazed door at the right end, and an early 20th-century 4-light window under a deep bracketed hood above. The short left (west) return wall of the main house, in front of the service wing, has a replacement window in the lower storey and 2-light casement window above, with an external brick stack to the left of the upper window.

Set back to the left is a 2-storey 4-bay service wing under a hipped roof of graded slates on projecting eaves, with stone end stacks. The upper storey has 2-light casements similar to the main house. The lower storey has a lean-to veranda on rustic timber posts. The entrance right of centre has a half-glazed panel door under a 3-pane overlight. To the left are 12-pane hornless sash windows. To the right is a brick lean-to inside the veranda with modern casement windows. A former coursed stone garden wall abuts at the left end. Beyond this is a lower 2-storey 2-window extension, formerly housing more service rooms, of whitened coursed rubble stone under a hipped roof. The lower storey has a half-glazed boarded door and a link to a formerly detached and restored small stone outbuilding. The upper storey has two 2-light casements.

At the rear is the original gabled building of scribed roughcast, slate roof and stone stack to the right. Its central hipped half-glazed porch has a half-glazed door flanked by wooden cross windows. Further right is a similar 3-light mullioned and transomed window, and further left a replacement window in an earlier opening. Above the entrance is a 2-light casement under a gable. This and a gabled 3-light casement window to its left have inserted vases in the gables. Further right is a 12-pane sash window turned on its side to slide horizontally.

The 4-bay service wing projecting behind the main house has a fielded-panel door left of centre under an overlight, flanked by 12-pane hornless sash windows, with a shorter 16-pane hornless sash window at the right end. The upper storey has 2-light casement windows similar to the front, though the centre-right window is blind. Return walls have similar windows. The extension of the wing has a 2-light window upper left, two 2-light windows in the lower storey and a lean-to against the end wall.

The central entrance hall contains a quarter-turn stair with renewed fretwork 17th-century style balusters and moulded newel. The left-hand room retains a mural depicting the Triumph of Neptune, which was concealed behind plasterboard at the time of inspection for its protection. In the upper storey the landing and a small dressing room above the entrance have segmental plaster vaults. The right-hand room has a shallow quadripartite plaster vault and the left-hand room a shallow cambered plaster vault. In the rear of the main house the earlier building retains two collar beam trusses, superimposed on one of which are later principals at higher level, indicating that an original farm building has been heightened.