Lwyn-onn Farm

Lwyn-onn Farm is a farm complex built around a large U-shaped courtyard, opening to the southeast. The core of the farm dates to the 18th century and includes a two-storey main range with a lofted hammel, corn-barn, and former cartsheds, which now form part of the farmhouse. Single-storey projecting wings flank the main range, one to the south (left) containing a cowhouse and one to the north (right) containing stables. The farm is constructed of granite rubble with limestone dressings, and has a decorative 'fishscale' slate roof with stone copings and kneelers, which mirrors the roof of Plas Llwynonn.

To the south end of the main range is a three-bay hammel with arched heads above the openings, attached to a central corn-barn. A full-length loft with louvred ventilators runs above it, extending over the corn-barn threshing floor. To the north of the corn-barn are former cartsheds, also with arched heads, now incorporated into the farmhouse. The farmhouse itself, positioned in the angle to the north, is a two-storey, three-window range with a central gabled porch featuring half-glazed panels. The ground-floor windows are 16-pane sashes, while the upper floor has a mix of 16-pane (right side) and 12-pane sashes. The lintels over the windows are a combination of slate and stone, with stone sills.

The current farmhouse configuration is a later addition, created by extending what were originally the servant's quarters into the cartsheds to the south and the stables of the eastern projecting wing. The gable of each projecting wing features a double cartshed with stone four-centred arch heads. The northern wing has stables, some of which have been converted into part of the farmhouse, while the southern wing includes a long cowhouse with massive gritstone lintels.

A separate range runs northeast of the farmyard, containing three lean-to pigsties and henhouses, and a boiling house with a door in one gable and a chimney in the other, linked by a small stone privy. All these structures have stone walls and slate roofs. The boiling house contains a brick oven and boiler, and bears the inscription '1872'.