The remains are fragmentary, the walls reduced to their lower courses, and no architectural features, no carved stonework, no doorway jambs or window dressings, have made it through the centuries intact. The footprint is modest, roughly fourteen metres east to west and eight metres north to south, with walls nearly a metre thick, built not from dressed stone but from substantial field boulders laid together.

The church shows up on an early seventeenth-century map of Ardagh barony, now held in the British Library as Cotton MS Augustus I.ii.25, where it is labelled as the church of 'Lissabane'. The name Aghintemple, which contains the Irish word for church, suggests the site had a religious function embedded in local memory long before any cartographer recorded it. The ruins sit just off-centre to the north-east within what may be an ecclesiastical enclosure, the kind of roughly circular or oval boundary, often surviving as a raised bank or a curving field boundary, that frequently marks the limits of an early Irish religious settlement. Whether the enclosure and the church belong to the same phase of activity is not clear from what remains above ground.