Ty'n Llwyn including Agricultural Range to N

The house, known as Ty'n Llwyn, is a farmhouse dating from the 17th and 18th centuries, built of rubble with boulder foundations. The eastern elevation has been partly whitened, and the roofs are slate with tiled ridges. The original layout consists of a two-unit, south-facing main range and a shorter wing to the north. An early cowhouse was added to the north wing, and a later service block with a catslide roof fills the angle between the two ranges, featuring a squat brewhouse stack in the centre. Chimneys are situated at the ends of the ranges; the left and rear ones are full-height with simple capping, while the right one is a reduced stump. The gable parapets have slate coping and kneelers, apparently with reused stonework when the main elevation was raised in the 19th century. The front elevation features an entrance against the left chimney, with a boarded door, a Victorian three-pane overlight, and a slated canopy porch. To the right is an 8-pane 19th-century horned sash window, with a similar six-pane window alongside; two smaller six-pane sashes light the upper floor, set within catslide dormers that break the eaves. A later single-storey lean-to has been added to the right, with a nine-pane fixed window to the front and a modern service entrance to the rear.

The eastern elevation has an open entrance to the catslide on the left, with a 12-pane 20th-century window to the right, and two small windows to an advanced section beyond. There is an entrance with flanking window openings to the broad northern gable end, with projecting lintels of slatestone; an upper entrance is located on the main block to the right. The window openings on this side rise from left to right, conforming to the slope of the hillside.

Inside, the former hall is to the left of the main block, with a parlour to the right and a service room to the rear. The original staircase was likely located to the left of the end fireplace, where a lobby-entry now exists. The fireplace is large, featuring a high bressummer with a finely stopped-chamfered run-out stop. The hall ceiling has finely stopped-chamfered main beams and joists, with some joists replaced by plain modern members. A section of original post-and-panel partition remains in the rear service room, now partially obscured by shelving. The first floor contains two two-panel fielded oak doors of late 17th/early 18th century character, which appear to have been relocated from elsewhere in the house. Reused crucks support the outshut roof.