What remains of Killiam Church amounts to little more than foundation courses and the lowest surviving masonry of walls that once stood to full height, the whole of it overgrown and quietly dissolving back into the landscape. It measures roughly fourteen metres long and just over five metres wide, oriented east to west in the manner typical of early Christian and medieval church buildings in Ireland, and almost nothing of its original architectural detail is legible any longer. A doorway near the western end of the south wall has been robbed out, its stones long since carted away for other uses, leaving only a gap where dressed stonework once framed an entrance.

One genuinely puzzling feature survives at the eastern end, where two parallel lines of walling run roughly 1.75 metres apart. The outer line may indicate buttressing added to strengthen the gable, or it could represent a second gable wall, suggesting at some point an addition or rebuilding of the east end. Without surviving elevation or architectural ornament, it is difficult to say more with certainty. The church is referenced in O'Flanagan's 1927 survey, which places it within a broader record of ecclesiastical remains across the region. Enclosing the church is a cashel burial ground, a roughly circular or oval enclosure of stone walling that in Ireland typically marks a site of early ecclesiastical use, often predating the Norman period and sometimes associated with a local saint or early monastic community.

The site sits in open grassland and is not formally managed or signposted, so the remains are easy to overlook even when standing close to them. The cashel enclosure wall, if traceable, offers the clearest sense of the site's original extent and character. The proximity to Lough Corrib means the ground can be soft, and the vegetation dense enough in summer to obscure even the foundation lines that are the church's most legible surviving feature.