The north-west angle, built with alternating long and short quoins, a technique sometimes called long-and-short work in which stones are laid alternately upright and flat to bind a corner together, now stands roughly 1.7 metres high and less than a metre wide. Forty-odd years ago it was closer to three metres. The rest of the building, which measured approximately 16 metres east to west and 6 metres north to south, has collapsed to low ivy-covered footings, their sub-circular graveyard enclosure marking the perimeter of what was once a functioning place of worship. The whole sits on elevated pasture at the northern end of a ridge, with Lough Owel visible about 300 metres to the south-west.

The church was already a ruin by the mid-seventeenth century. The terrier accompanying the Down Survey parish map of Portnashangan, produced between 1656 and 1659, noted matter-of-factly that there were at Portnesangan "the Walls of a Church", suggesting even then the building had been abandoned long enough to register simply as masonry rather than a living institution. A generation earlier, in 1631, a David Thomas was formally presented to the vicarage of Portneshangan alongside the rectory of Castlecor and the vicarage of Raconnell, so some ecclesiastical organisation around the site persisted into the early seventeenth century at least. The church left no obvious internal evidence of division into nave and chancel, and no decorated or cut stonework has been recorded at the site. Two ringforts lie close by, one about 60 metres to the east and another roughly 70 metres to the south-west, a reminder that this ridge was occupied and managed long before the medieval church was built.