The south wall is now little more than a sod-covered rise in the ground, its line confirmed more by the graves that have been dug against it than by any masonry. Fragments of cut stone, including what appears to be part of a window or door surround, lie in a moss-covered heap near the north wall, which itself survives to about three metres in the middle section before collapsing at either end.

The church is dedicated to St Colman, a figure common enough in early Irish ecclesiastical tradition to have lent his name to dozens of sites across the country. Here, the dedication gave the townland its name, and the place was already recorded as Killcollman on the Down Survey barony map of 1656 to 1658, a mid-seventeenth-century cartographic project commissioned to document landholdings across Ireland following the Cromwellian confiscations. The building itself is rectangular, roughly eighteen metres along its longer axis, with walls of coursed limestone over a rubble core. It sits in the south-east corner of a graveyard that is still in use, towards the base of a south-west-facing slope where the land flattens out into damp pasture. A holy well lies about twenty metres to the west-north-west, a pairing of church and well that was common across medieval Ireland, where both functioned as focal points for local devotion and community life.

The interior is overgrown and strewn with loose stone, and much of what the building once looked like can only be inferred from the surviving fragments. The east gable has largely gone, though a short section remains at its junction with the north wall. What is left rewards close attention rather than a quick glance; the better-preserved west gable in particular gives a sense of the original scale of a building that has otherwise almost entirely returned to the ground.