It appears in the archaeological record simply as a house of indeterminate date, which is less an admission of defeat than an honest reflection of how many structures in the west of Ireland resist easy classification. Stone walls that could be medieval can look much the same as stone walls that are post-Famine, and without excavation or documentary evidence, the gap between the two can remain open for a long time.

Inishlyon sits within the broader island landscape of south Connemara, a region where human settlement stretches back several thousand years and where the archaeological record is dense but often frustratingly incomplete. Islands like this one were occupied and abandoned across multiple periods, used for farming, fishing, and occasional refuge, and the structures left behind frequently blur into the landscape rather than announce themselves. A house recorded without a date is not unusual in this context; it simply means the available evidence has not yet resolved the question of when someone built here, or indeed when they stopped.