The structure sits in the north-east quadrant of Barnarobin rath, a ringfort of the kind once used across Ireland as a defended farmstead or homestead enclosure. What remains is modest: a roughly four-by-three-and-three-quarter metre rectangle, defined by the low footings of a dry-stone rubble limestone wall, the courses laid without mortar and now standing barely thirty centimetres above ground level, with a width of around ninety centimetres. Where the original entrance once broke the circuit of that wall, no trace is legible.

The relationship between this structure and the rath it occupies raises quiet questions. Internal buildings within raths are not unusual; they often represent subsidiary use of an enclosure, sometimes agricultural, sometimes domestic, and occasionally from a period well after the original ringfort fell out of primary use. Without excavation, it is impossible to say whether this structure was contemporary with the rath itself or represents a later intrusion into a convenient, ready-made enclosure. The limestone rubble construction is consistent with vernacular building practice across the region, but the absence of mortar and the near-total collapse of the wall height leave very little to go on. What can be said is that the building was small, rectangular, and at some point simply abandoned to the vegetation.