No windows, no doorways, no decorative stonework remain to be read. What survives is essentially a section of the east wall, the end of the building that would once have contained the altar, now nameless and featureless beneath the growth.

The church was already a ruin by 1615, a detail recorded by Brady in the nineteenth century, which places its collapse or abandonment somewhere in the late medieval or early post-Reformation period. Many rural Irish parish churches fell out of use during the sixteenth century as the upheavals of the Reformation disrupted ecclesiastical structures, and smaller or more remote communities were often left without functioning buildings. Whether Kilcaskan's church succumbed to that broader pattern or to more local circumstances, the record does not say. What is clear is that by the early seventeenth century it was already gone as a working building, leaving the graveyard to continue in use long after the walls that once defined its purpose had begun to dissolve back into the ground.