Pen-yr-Allt

Pen-yr-Allt is a one-and-a-half-storey house built in an irregular Z-plan, dating back to the 18th century. The exterior is of rendered and whitened rubble with old slate roofs retaining small slates, and crudely-kneelered rubble gable parapets to the original T-shaped section. This section also has projecting gabled end chimneys and a large lateral chimney with a tall stack at the rear of the main block. The front of the house is formed by two ranges set at right angles. The right-hand range contains the entrance, which features an 18th-century six-panel door set within a frame with ovolo moulding; the upper four panels have been removed and replaced with glazing. Above the entrance is a sandstone heraldic plaque with the date 1710 and a Latin inscription reading 'What you have not made yourself you cannot call your own'. To the left of the entrance is a 19th-century 12-pane casement window with a projecting stone sill, and to the right a late 19th-century two-part eight-pane French window with marginal glazing. The upper floor has modern two-pane casement windows contained within two hipped-roofed dormers that deeply break the eaves. The left wing also has 12-pane casements, with the upper window within a similar dormer. A late 19th-century lean-to porch, with a five-panel door, is extruded in the angle formed by the projecting chimney breast on the left gable end.

A 19th-century L-shaped addition adjoins the rear of the house, creating a double-pile arrangement with the front ranges. This addition has a single-storey canted bay to its advanced north-east gable, featuring 19th-century 12-pane sashes; the first floor has a tripartite sash with a central nine-pane window flanked by three-pane sections. The rear elevation contains further contemporary 12-pane sashes, a modern entrance to the left return of a gabled projection, and a 19th-century lateral chimney on the south-west side. A 19th-century 16-pane cross-window is located to the right of the lateral chimney at the rear of the original range, with a 12-pane casement above, contained within a shallow catslide dormer. A small, single-storey 19th-century projection adjoins the south-east arm of the original T-shaped section.

The interior features a wide early 18th-century lugged pine architrave to the entrance passage, and plain beams to the ground floor ceilings. The main ground floor room has a moulded cornice and panelled shutters and reveals. There is reported to be relocated panelling in the left-hand range, though this was not inspected at the time of the survey.