It carries the designation "indeterminate date", a phrase that appears in the archaeological record when a structure resists confident classification, too ambiguous in its fabric or form to be assigned a century with any confidence. That uncertainty is itself a kind of statement about rural Mayo, where buildings were put up, altered, abandoned, and occasionally reoccupied across generations without anyone thinking to document the process.

Ballyheer is a small townland in a county that contains hundreds of similar placenames, each one a compressed fragment of older Irish geography. The house has been noted as a monument, meaning it has come to the attention of those who catalogue surviving structures of potential historical interest, but beyond its location and its stubborn refusal to yield a date, the record is thin. It may be a remnant of pre-Famine settlement, or it may be older still. Mayo was among the counties most severely affected by the Famine of the 1840s, and the landscape retains the outlines of communities that simply ceased to exist, roofless walls slowly being reclaimed by rushes and bog grass. A house of indeterminate date in this part of the country carries that weight implicitly, even when no specific history can be attached to it.