What makes it worth attention is not its size, which is modest at roughly eight metres by five, but the accumulation of ritual features clustered around it, each one a distinct object of early medieval devotion, arranged across a patch of island ground as if the place once functioned as a self-contained sacred precinct.

The church itself is built of randomly coursed local granite, mortared with a mix of sand, lime, and crushed seashell, a practical solution in a coastal environment where shell was abundant and imported materials were not. Its doorway is trabeate, meaning it uses a flat horizontal lintel rather than an arch, though the lintel here is now missing. Unusually, this entrance is set not in the west wall, as was conventional for early Irish churches, but off-centre in the north wall. The south wall retains traces of a splayed window, widening inward to admit more light. Around the church, the landscape is dense with associated monuments. Immediately to the north lies a small subrectangular graveyard enclosed by a slab-revetted stone wall, its original western entrance still flanked by tall upright stones. Nearby stand two leachta, low cairn-like structures, each associated in early Irish Christianity with prayer and commemoration, one accompanied by a cross-slab and a bullaun, a boulder with a natural or artificially deepened hollow that may have served ritual or practical purposes. Roughly twelve metres to the east of the church, a pair of portal stones stand in a configuration that has resisted easy explanation.

Bramble has taken firm hold along the west end of the north wall and around both gables, making a close inspection difficult. The interior is heavily obscured by collapsed material, and the west gable, though still standing to around two metres, is similarly buried on its outer face. What survives is fragmentary but legible enough to suggest that Oileán Máisean once supported a community of some devotional seriousness, organised around this small building and its surrounding monuments with a deliberateness that the ruins, even now, still faintly communicate.