The surviving lower courses outline a building roughly five and a half metres on each side, nearly square, its walls worn down to their foundations by time and weather. No date has been established for it, which places it in an awkward category for anyone trying to make sense of it: too ambiguous to assign confidently to a period, too substantial to ignore.

Church Island sits in Lough Currane near Waterville on the Iveragh Peninsula, a landscape that preserves an unusually dense concentration of early Christian and medieval remains. The island takes its name from a church that was part of a monastic settlement, and the presence of a domestic-scale rectangular building nearby is not surprising in that context. Rectangular building forms in Ireland tend to suggest medieval or later occupation rather than the circular or oval structures more typical of the early Christian period, though without excavation or dateable finds, the sequence here remains open. What the archaeology of Iveragh makes clear is that these islands and lake shores were occupied, farmed, and prayed in across many centuries, and the foundations on Church Island are one quiet remnant of that long, layered use.