The building occupies a roughly rectangular footprint measuring six metres east to west and just over four metres north to south, its perimeter formed by a stony bank averaging 1.3 metres wide. What makes it quietly odd is what survives inside: two upright slabs that may once have served as grave-markers, suggesting this was not simply a domestic or agricultural space. A further six-metre run of upright slabs outside the building's north-western corner adds to the ambiguity, hinting at boundaries or alignments whose original logic has long since dissolved.

The site is recorded as part of a wider enclosure, and the structural details point to early ecclesiastical or mortuary use, though nothing about the surviving fabric is definitive. Drystone revetting, a technique in which stones are set without mortar to face and stabilise an earthen bank, is visible internally along the western and northern walls, though the southern side of the bank has largely collapsed or been lost. The name Cill Buaine is itself suggestive: "cill" in Irish typically denotes an early church or monastic cell, a small religious foundation often enclosed within a roughly circular earthwork of this kind. The combination of possible grave-markers, enclosure, and place-name points toward an early Christian site, though the record is careful not to overstate what the physical remains can confirm. The archaeological survey of the Iveragh Peninsula, published by Cork University Press in 1996, catalogued the structure among the many such sites scattered across this part of south Kerry.