Barn and byre building associated with the late seventeenth century mansion of Gilfach Berthog (NPRN 17364).
The north part of the building is a threshing barn with opposed cart entries. It features three pairs of scarfed crucks that could be contemporary with the house. The north gable wall differs from the side walls, though all are stone rubble, and it is possible that the sides were originally timber framed. The south end of the building was the byre or cow house.
