It measured roughly 5.8 metres east to west and 4.9 metres across, its walls built in the double-skin drystone method with a rubble core filling the gap between, a technique associated with vernacular building traditions across the west of Ireland. There is nothing left to see now. The structure was destroyed around 1979 during field clearance, and with it went any chance of reading its age or purpose from the fabric of the building itself.

What survives instead is fragmentary but suggestive. When the house was cleared, numerous sherds of pottery came out of the interior. Pottery finds of this kind can point in many directions depending on the ware, but their presence inside the walls at least confirms the building was used and inhabited, not merely begun and abandoned. Local knowledge at the time of recording also placed a second, broadly similar structure about 150 metres to the north-east. That one is equally gone, leaving the two as a kind of paired absence in the record, houses that were standing within living memory and are now farmland. The date of the Ardgaineen house remains genuinely undetermined; without excavation of the pottery or the ground beneath, no period can be confidently assigned, and the oval plan alone does not settle the question, as that form appears at widely different periods across Irish prehistory and the early medieval centuries.