What makes the site at Kilgulbin unusual is the possibility that it was once a trivallate ecclesiastical enclosure, meaning it was defined by three concentric boundary rings rather than the single or double circuits more commonly encountered at early Irish church sites. That layering of boundaries, where each ring may have marked a different degree of sacred or administrative space, hints at a place of some significance in the early medieval religious landscape, even if almost nothing of it now survives above ground in legible form.

Within the outermost enclosure sits a roughly square stone structure, measuring approximately 31 metres north to south and 30 metres east to west, with walls around two metres thick. In its north-eastern sector are the possible remains of a church, a sub-square structure roughly 8.3 metres by 7.5 metres, with walls about 1.2 metres thick. To the south-west of these foundations lie at least four small mounds and a scatter of stones, and to the west a shallow depression in the ground. None of these features announce themselves dramatically; they read more as subtle disturbances in the landscape than as conventional ruins. The site is noted in connection with other ecclesiastical remains in the area, including Ardfert Cathedral and sites at Glenderry and Glandahalin East, suggesting it belongs to a broader pattern of early Christian settlement across this part of Kerry. The description of the site was first set out in C. Toal's North Kerry Archaeological Survey, published in 1995.