It appears in the archaeological record simply as a structure of indeterminate age, which is itself a quietly telling designation. Most recorded buildings can be anchored, however loosely, to a century or a phase of construction. That this one cannot places it in an ambiguous category, old enough to be noted, elusive enough to remain unclassified.

Tomnahulla is a small rural townland in Galway, and like many such places in the west of Ireland, its landscape holds the overlapping traces of several centuries of habitation. Houses of uncertain date are not uncommon in areas where vernacular building traditions changed slowly, where structures were repaired and reused across generations, or where the materials, dry-laid stone or earthen walls, leave few dateable signatures. Without more specific documentation attached to this particular site, what survives is essentially the fact of its existence as a recorded monument, a building whose biography has not yet been recovered.