The feature at Faunarooska is easy to miss, a subcircular outline measuring roughly 3.6 metres east to west and 3 metres north to south, sitting towards the south-east of centre within the ringfort's flat, grassed interior. Poorly preserved and unassuming, it is tentatively identified as a hut site, the kind of small domestic structure that would once have sheltered a family or a farmhand within the protective enclosure of the surrounding earthwork.

Ringforts, circular enclosures defined by banks and ditches, were the dominant settlement form in early medieval Ireland, typically dating from roughly the sixth to the twelfth centuries, though many were built upon and adapted across long periods. The one at Faunarooska sits within a large multiperiod field system, meaning the landscape around it accumulated layers of human activity across different eras rather than belonging to any single moment in time. What makes the interior feature of particular interest is the small rectangular annexe that appears to abut its south-east sector. Annexes of this kind are sometimes interpreted as byres, storage spaces, or additional sleeping quarters, though at Faunarooska the preservation is poor enough that any firm conclusion would be speculative. What survives is an outline, a suggestion of enclosure within an enclosure, a domestic scale set against an agricultural one.