At roughly twelve metres long and just over five metres wide externally, it was never a large building, but what it once had in terms of decoration has been almost entirely lost. The walls of the nave survive to only about two metres in height, the chancel arch is reduced to its basal stones, and the south doorway has all but vanished. What gives archaeologists and architectural historians pause is the placement of that doorway: rather than sitting towards the western end of the south wall, as was the usual convention in Irish Romanesque churches, it was positioned towards the east. The reason for this deviation remains unexplained.

The church was built in the Romanesque style that flourished in Ireland during the twelfth century, characterised by elaborately carved stonework and layered, receding arches. Here, the chancel arch, which separated the nave from the smaller chancel beyond, had four orders, meaning four concentric arched frames stepping inward, each narrower than the last, with widths ranging from around 2.5 metres down to 1.53 metres. The voussoirs, the wedge-shaped stones forming those arches, were carved with chevrons, the zigzag ornament typical of Irish and Anglo-Norman Romanesque work. The outer and innermost orders rested on three-quarter-round attached pillars with mouldings, while the two middle orders had simpler half-pillars. The south pier survives in better condition than the north. What has been lost makes scholars careful about conclusions; Jenifer Ní Ghrádaigh's 2006 analysis of the remaining Romanesque fragments is the closest thing to a full reckoning with what the building once looked like. Earlier accounts by Thomas Johnson Westropp, writing in 1897 and again in the early 1900s, recorded the church when it was already in a deteriorated state. The chancel retains a small stone altar set against the east wall, modest in scale at 1.7 metres long and half a metre high, and a single narrow window in the west wall of the nave lets in a thin blade of light.