What makes it quietly strange is not just its isolation but its near-total absence from the documentary record. It does not appear on the Ordnance Survey six-inch maps of 1838 or 1921, which means that for the better part of two centuries of cartographic effort, this building was either overlooked or simply did not register as worth marking. A structure that was evidently lived in left almost no official trace.

The house at An Mhoing Mhór measures roughly 13.7 metres along its longer axis, oriented north-northeast to south-southwest, and just over 6 metres across. The walls survive as drystone footings, about 1.1 metres wide, built from large and medium-sized stones laid without mortar, a technique common to vernacular rural building across the west of Ireland. The entrance, 1.3 metres wide, sits at the northern end of the eastern wall. Inside, a single dividing wall separates the interior into two rooms of unequal size, an arrangement typical of modest two-room dwellings of the eighteenth or nineteenth century, where one end might serve as sleeping quarters and the other as a combined kitchen and living space. A stream runs about 100 metres to the southwest, near enough for daily use, and a separate enclosure lies just 8 metres to the west, suggesting the house was part of a small working holding. The prominent rise it occupies, set within the surrounding peatland, would have offered some drainage and perhaps a degree of visibility across the landscape, practical advantages in a wet and often exposed terrain.