Not medieval, not post-medieval, not confidently assigned to any period at all. It is simply a house, noted and mapped, its origins unresolved.

Kilcahill is a small rural townland in Galway, and like many such places it carries layers of occupation that resist easy reading. A structure described only as a house, with no confirmed date range, could reflect any number of circumstances: walls reduced to footings, a building type too generic to date by form alone, or a site that simply has not yet received detailed field examination. The "indeterminate" classification is not a failure so much as an honest acknowledgement that the physical evidence, at least as recorded, does not yet support a firmer conclusion.