It appears on the archaeological record with the quietly unsettling designation "indeterminate date", meaning that whoever catalogued it could not pin it to a century, let alone a decade. That alone sets it apart from the majority of recorded structures, which can usually be slotted into a recognisable building tradition, a landlord's estate map, or a phase of post-Famine clearance.

Glenderry sits in a part of Kerry where the landscape holds an unusual density of remains from many different periods, and an unattributed house here could belong to almost any era of habitation. The indeterminate classification is not merely an administrative gap. It reflects a genuine difficulty that arises when a structure lacks the diagnostic features, documentary trail, or stratigraphic context needed to place it in time. Without datable materials in the walls, without a reference on the estate papers or the first Ordnance Survey sheets, a building can simply sit in the record as an open question.