Known in Irish as Cill Cheannanach, the building is remarkably intact for something that belongs to the early Christian period, and its proportions are modest almost to the point of severity: roughly five metres long and just under four metres wide externally, it is the kind of structure that rewards attention rather than scale.

The oratory is oriented east to west, as early Christian ecclesiastical buildings typically are, and its doorway is trabeate, meaning the opening is spanned by a flat horizontal lintel rather than an arch, a technique associated with the earliest phase of Irish stone church construction. The east gable carries a triangular-headed window, a feature that gives the building a slightly archaic character even within that tradition. Projecting corbels, small stone brackets built into the masonry to support timbers or other structural elements, survive on three of the four corners. Within the same graveyard there is a crudely dressed triangular holed stone, tentatively identified as the endstone of a slab shrine, a type of grave marker used in early medieval Ireland where upright slabs were arranged around a burial. A holy well lies a short distance to the north-north-west, completing what appears to be a small but coherent early Christian sacred landscape gathered around a single prominent shore.