The structure is modest even by the standards of early Irish ecclesiastical sites, measuring roughly nine metres by five, with walls somewhere between eighty centimetres and a metre thick. No decorative stonework survives, no carved detail, no legible inscription. What remains is largely the idea of a building: a west door that can just about be read in the fabric, and a single eighteenth-century headstone lodged inside the east gable, the last datable evidence that anyone was still being buried here before the graveyard fell out of use entirely.

The site's obscurity is compounded by a tangle of competing names. Scholars have proposed that the adjacent townland name Kiladerrig may preserve an earlier identity for this very place, while the nearby name Kilbla, now fossilised in the townland of Ballybla, is thought to derive from a little-known early British saint, Blá or Bláan. Writing in 1967, Liam Price suggested that the church itself may date from the period when Scandinavian settlers in the Wicklow region were being converted to Christianity, which would place its origins somewhere in the ninth or tenth century, a time when the Norse town of Wicklow was among the more significant settlements on the east coast of Ireland. If Price's reading is correct, three distinct place-names, Killoughter, Kiladerrig, and Kilbla, may all point to the same small building, clustered within a few hundred metres of one another and perhaps preserving the memory of a single early Christian community whose patron saint has since been entirely forgotten.