Farmhouse at Plas Cemlyn with curved walling to north and wall incorporating goose pens to south

Plas Cemlyn is a 2-storey farmhouse with an attic, featuring three windows on its main facade and a 2-storey servants wing at the rear. To the right side, there is a lofted dairy. The farmhouse has rubble walls and rubble voussoir lintels on the main elevation, topped with a purple slate roof that has interlocking ridge tiles. Gable end chimneys, which are rendered and capped, are present, with the larger chimney on the left side serving the inglenook. The symmetrical main elevation is slightly offset to the right and includes a central gabled porch with a glazed door featuring margin panes, flanked by 4-pane sash windows. The first-floor sash windows are of reduced height. Modern windows have been added to the right gable and the rear elevations.

The servants wing at the rear has a tall gable end chimney and an external stone staircase leading to the former headman's accommodation on the first floor. It features modern small-paned windows on the ground floor and small 4-paned horned sashes on the first floor. The dairy wing also has a gable end chimney with capping and a 4-pane sash window on the west elevation.

In the eastern angle between the house and the dairy, there is a former horse works bounded by a curving stone wall that forms an arc, which includes a blocked archway at the south end. Attached to the south side of the farmhouse is a high stone garden wall that incorporates a row of recessed bays at ground level on the west side. These stone boxes, roofed with rough slabs, have openings narrowed with brick facings, likely used as nesting boxes for geese or ducks.

The interior was not inspected during the survey.