That label is more revealing than it might first appear. When surveyors cannot pin a building to a century, let alone a decade, it usually means the physical remains offer few diagnostic clues: no dateable stonework, no documentary trail, no associated finds to anchor it in time. The structure is recognised as significant enough to record, yet resists the tidier categories that history tends to prefer.

Carheens is a small townland, and the wider landscape of County Galway is dense with the remnants of rural habitation stretching back through the post-medieval period, the centuries of land clearance and resettlement, and further still. Houses of indeterminate date in this region might be the shells of pre-Famine cottages, or they might be considerably older, their construction methods too vernacular and too consistent across centuries to allow easy classification. Without additional detail, the structure at Carheens sits in that ambiguous category of places that have been noticed but not yet fully understood.