Barn range at Plas

The barn range at Plas is a large L-shaped structure dating from the 19th century. It consists of a long range that backs onto the lane and a return that faces the farmhouse, incorporating an entrance to the rectangular farmyard. The building is constructed of limewashed stone rubble, featuring a Welsh slate roof on the long range and a stone tile roof on the return, with inward-facing pitches that are corrugated.

The long range includes a barn to the west with two rows of ventilation slits, one of which is blocked on the roadside. It has high opposing double doors with a gabled porch roof facing the lane, as well as a cart shed wing to the east that features two wide bays with timber lintels and a hayloft above, facing the farmyard. The return range has a hipped roof at an angle, topped with a weathervane, and a roughly central double doorway that serves as the entrance to the farmyard, along with a pitching door in the gable end.

Inside, the roadside range has a stone threshing floor and features trusses with tie beams, some struts, and three rows of trenched purlins, which have been partly renewed. The return range has pegged collar and tie trusses with three rows of trenched purlins, and the interior is divided both vertically and horizontally, with part of it used as a cowshed.