Not medieval, not Georgian, not anything in particular, at least not officially. The designation "indeterminate date" is itself a small curiosity, a formal admission that whatever stands or once stood here has not yet yielded enough evidence to place it confidently in time.

Colesgrove is a quiet townland, and the building recorded there has not been studied closely enough for its age or origins to be established. In Irish archaeological recording, structures are assigned to broad periods where possible, so when a site receives no period at all, it usually means the physical fabric is ambiguous, documentation is absent, or a proper assessment simply has not yet taken place. The house may be a roofless shell with walls that could belong to any century, or it may be something more substantial whose history has slipped out of the written record. Without excavation or detailed architectural analysis, the question of when it was built remains genuinely open.