The nave and chancel layout, typical of rural Irish parish churches, survives only partially: the south wall of the nave is gone entirely, the windows have been broken out, and ivy has steadily colonised what masonry remains. A concrete wall monument bolted against the north wall at the east end sits incongruously against the medieval fabric, and cement rendering covers part of the nave's exterior, the kind of well-intentioned intervention that complicates rather than preserves.

The church appears in the ecclesiastical taxation of the Diocese of Killaloe in 1302, confirming it was an active parish with assessable income at that point. By the time of the Royal Visitation of 1615, the picture had changed sharply: the rectory of Lisbunny was recorded as 'church and chancell down', meaning both had already fallen into ruin before the seventeenth century was properly underway. One detail quietly survives that speaks to the church's earlier working life: a niche for a piscina in the south wall of the chancel. A piscina is a small stone basin set into a wall, used by the priest to rinse the chalice and his hands during Mass, and its presence here is a reminder of the liturgical routine that once animated the building. When Ordnance Survey workers visited around 1840, they recorded the ruins of a sacristy extending from the north wall of the chancel, a rectangular structure measuring approximately eight metres by five, though this had disappeared from view by later surveys. A hall house, a type of fortified domestic building associated with Anglo-Norman settlement, stands to the north, suggesting this was once a site of some local significance beyond its purely religious function.