What remains is the east gable, measuring about seven metres along the north-south axis, with a short stub of the south wall still attached. The most striking feature is the central east window, which retains a single ogee-headed light, that characteristic late medieval S-curved arch form, though its north jamb is now missing. Beside the window opening, a lintel sits over a splayed embrasure, and the wall itself contains two small fitted recesses: a low wall press at the south end, barely seventy centimetres high, likely used to store liturgical objects, and a taller niche at the north end, covered by a pointed arch with a chamfered edge and a projecting limestone sill.

A description written in 1700 identifies this as the chapel of Ballygarvan, said to have been built by an Irish lady who was the wife of the Lord of Muskerry, placing its origins within one of the most powerful Gaelic dynasties of late medieval Munster. A subsequent assessment by Casey in 1983 dates the construction to the early sixteenth century, which is broadly consistent with the architectural detail. Locally, the ruins have long been called Seán Chlochár, meaning the old Belfry, a name recorded by O'Leary in 1918, suggesting that a tower or bell feature was once part of the structure, though nothing of it survives above ground. The church sits within a detached portion of Carrigaline parish, an administrative curiosity in itself, and there is no evidence to suggest it was ever associated with a monastic foundation.