No floor plan survives, no doorway, no window arch. Only this one piece of mortared limestone and sandstone, holding itself upright in a field.

The 1838 Ordnance Survey six-inch map recorded a complete rectangular building here, roughly fifteen metres along its longer axis and eight metres across, and labelled it Carrowcastle Church. By the 1931 edition, the mapmakers had reduced it to a single annotated line: "Carrowcastle Church (in Ruins)". Whatever brought the building down happened in the ninety-odd years between those two surveys. The surviving wall fragment shows two quite different faces. The western side, likely the original exterior, is built in alternating courses of very large, irregular blocks and thin horizontal stones laid flat, a technique that gives the masonry a banded, almost deliberate appearance. The eastern face uses stones of more even and regular size throughout. A low, grass-covered stony rise, about two metres wide, runs along the base of the eastern face, all that remains of the surrounding debris or perhaps a buried foundation spread. The church sits roughly thirty metres north-north-east of an earthwork castle, the two sites close enough in proximity to suggest they once formed part of the same local landscape of authority and observance, though the wall itself keeps no record of who built it or when.