It is a modest structure, measuring roughly 7.9 metres long and 3.7 metres wide, oriented east to west in the manner typical of early Christian and medieval ecclesiastical buildings in Ireland. What makes it quietly compelling is not its size but its detail: a pointed-arch doorway and a plain window punctuate the north wall, while the east gable holds a single-light ogee-headed window, a late medieval decorative form in which the arch curves outward before tapering to a point, with an altar set directly beneath it. An internal partition wall, still partially standing at the western end and bonded into the north side-wall, suggests the building may once have been divided in function, though its precise liturgical arrangement remains uncertain.

The church sits within a broader cluster of remains that speaks to sustained, layered use of this small patch of ground. Three further possible ecclesiastical buildings lie to the east and west, and a holy well, the kind of site that in Ireland often predates formal Christian organisation and continued to attract devotion long after, lies to the south-east. At the east gable, a grave plot measuring just over three metres by two and a half metres contains five plain flagstones, unadorned markers whose simplicity contrasts with the relative elaboration of the window above them. The site was noted by T.J. Westropp in 1895 and later by Harold Leask, whose work on Irish churches remains a foundational reference, suggesting that Teampall an Ceathrair Álainn has drawn scholarly attention for well over a century without ever quite entering the popular imagination the way the more visited Aran monuments have.