The structure is modest in every dimension, five metres long, three and a half metres wide, and surviving to a height of just sixty centimetres, but its position is what gives it a quiet interest. Whoever built it chose to tuck it deliberately against the cashel's interior wall, using that older stonework as one boundary of the new building, a practical choice that also raises questions about the relationship between the two phases of construction.

The antiquarian Thomas Johnson Westropp, writing in 1901, judged the structure to be of late date, which suggests it post-dates the cashel itself by some considerable margin, though exactly how late remains unclear. Westropp was a prolific recorder of Clare's ancient monuments and his field observations from that period remain a useful baseline, even where they offer only broad conclusions. The rectangular, east-west orientation of the building is a fairly common alignment and does not in itself resolve the question of when it was built or what it was used for. What survives is largely a low, grassy footprint, the walls reduced to a low course that traces the outline of the room without revealing much of its interior arrangement.