This is one of three hut sites grouped on the landward side of the Doonallia promontory fort, a type of defended enclosure that uses a natural headland or raised platform as its boundary on one or more sides. Of the cluster, this one sits highest and furthest south, and despite the battering it has taken along its exposed western edge, where the bank has largely eroded away towards the platform rim, it remains the best preserved of the group.

The enclosure measures roughly 4.3 metres northeast to southwest and 4.9 metres northwest to southeast, its defining bank still standing to 0.65 metres on the interior southern side. A gap of 1.4 metres on the eastern side almost certainly marks the original entrance, opening into a flat, grassy interior. Where erosion has cut through the bank, a few stones are visible in the exposed face, though the stratigraphy, the layered sequence of deposits that archaeologists read for dating and phasing, is not evident here. The antiquarian Thomas Johnson Westropp visited the site around 1909 to 1910, producing a sketch of the fort's interior and noting only two huts within it. His references to a larger hut and a larger and more injured site are now understood to correspond to this structure and the two neighbouring enclosures beside it, suggesting a third feature had either escaped his attention or was already too degraded to register.