L-plan outbuilding at Ty'rberllan

The L-plan outbuilding at Ty'rberllan is a Grade II listed structure made of whitewashed rubble stone with close-eaved roofs. The barn on the east side features a slate roof and full-height central doors, along with two long loops to the left. To the right of the barn is a two-storey shallow lean-to made of stone, which has a corrugated-iron roof. The upper level includes dove entries on each side of a boarded loft opening positioned towards the right. Below this loft is a broad depressed-arched cart entry with stone voussoirs, and set back within is a second arch leading into the base of the barn. The barn itself has a gable end, with the north end displaying two loops and a loft door. The south range has an asbestos sheet roof, with one square loft opening to the right, one door to the left, and two doors to the right, all featuring cambered heads and stone voussoirs. The west gable end has a stone shelf beneath the gable, similar to that of the house.