Great Brithdir Farmhouse

Great Brithdir Farmhouse is an L-shaped, three-unit house with a lobby entry, built on a stone plinth. It features random rubble walls and a slate roof. The centrally placed stack has a roughcast base, while the upper part was rebuilt in brick around 1970. The front elevation has a gable on the right side and irregularly placed windows, consisting of three casements. To the left, there is a wide buttress. The centrally located gabled porch has a ledged and battened door on the west side. The east gable has a single casement window at eaves level. The west wall is built against an earth bank and includes a single casement window and a fixed light with concrete reveals below the wall plate. The south wall features two casement windows. The east wall of the south wing has a lean-to porch made of corrugated metal, with a ledged and battened door at the angle with the front range. To the left in the east wall, there is another casement window. The south gable is roughcast and has a brick stack.

The interior plan includes a former kitchen on the front left, a parlour on the front right, and an originally unheated room in the cross-wing. The kitchen has a single chamfered beam with a stepped stop, and a service room, accessed down stone steps through a ledged and battened door, is separated by a partition. The service room features a flagstone floor. The parlour contains a spine beam with a roll-moulded chamfer and has a quarter turn timber stair accessed through a ledged and battened door. The porch also has a flagstone floor, and inside the porch, there is a fragment of a timber beam dated 1695.