The structure is subcircular in plan, measuring roughly eight metres east to west and seven and a half metres north to south, and is defined by a single course of substantial stones. A gap on the western side may mark where the original entrance once stood, though nothing survives to confirm this with certainty. It is classified simply as a house of indeterminate date, which is perhaps the most honest thing that can be said about it.

The designation tells you something about the difficulty of reading such sites. Without excavation, a stone setting of this kind could belong to almost any period, from the prehistoric to the early medieval. What gives the Tooreena structure a particular quiet interest is its proximity to a megalithic tomb, a communal monument of the Neolithic period typically built to house the remains of the dead, which lies around four hundred metres to the northwest. Whether the two features are related in any meaningful way is unknown, but the pairing is not uncommon in the west of Ireland, where later communities often settled close to, or reused, much older landmarks in the landscape. The bog itself, which preserves organic material exceptionally well and can lock sites beneath layers of peat over centuries, may yet hold information that the surface stones alone cannot offer.