Measuring roughly six metres by three and a half metres, and rising about a metre from the ground, the sub-rectangular heap is thought to be the remains of a hut, though no entrance has ever been identified, leaving its original form and purpose genuinely open to interpretation.

Inis Mhic Aoibhleáin is a sparsely documented place, and this structure is no exception. Recorded by archaeologists Frank Coyne and Tracy Collins, the site resists easy categorisation. Without a visible doorway or threshold, it is difficult to say with certainty how it was entered, or indeed whether the absence of an entrance reflects the degree of collapse, a deliberate blocking in some later period, or simply the limits of what surface survey can reveal. What remains is a compact, almost featureless rise in the ground, the stones beneath the turf hinting at walls that once enclosed something, a shelter, a store, a dwelling, without giving much away.