A three-bay rectangular building lies on the west bank of the Nedd Fechan. It survives partly as foundation footings and partly as upstanding walling, and is one structure in a group of settlement features (NPRN 412848).
Internally the building measures 9.1m (ENE-WSW) by 2.8m with partition walls 2.8m and 6.1m from the west end. The westernmost dividing wall is slanted, edge-set slabs and could represent wall tumble. The wall footings are turfed-over boulders, 0.6m-0.8m wide and surviving to 0.5m high. The easternmost bay is defined by roughly-coursed walling of slabs and blocks 0.6m thick and standing to 1.2m high. It measures internally 2.7m by 2.9m. At the west end of the building the side wall footings project 1m beyond the end of the building as if to form a fourth bay but the outer wall, if there was one, is indistinct.
Narrow entrance gaps are visible in the south sides of the two end-bays.
On the outer north-east corner of the building, facing the stream, are two edge-set slabs, about 0.6m high, set against the building enclosing an area 1.1m wide and 0.9m long, open on the fourth side.
The good preservation of the eastern compartment raises questions of possible later re-use of part of the building. However, the proximity of a nineteenth century enclosure partition wall, just uphill to the west, may have led to the robbing of walling from that part of the building nearest to it.
