A fence running along its western perimeter may well be hiding additional uprights, meaning the circle is not simply incomplete through loss alone; part of it may simply be out of sight. What can be counted are thirteen surviving orthostats, the term used for the upright stones that form the body of such a monument, with one of those now lying prostrate on the ground. The original count is thought to have reached nineteen stones in all.

The circle at Carrigagrenane is oriented along a NE-SW axis, with an internal measurement of roughly 8.5 metres along that main line. What makes its arrangement particularly interesting is the entrance configuration: two of the stones are set radially, meaning they are oriented like spokes pointing outward from the centre rather than standing parallel to the circle's arc, and beyond them, aligned externally, a further two stones create a defined entrance passage. This kind of deliberate directionality is characteristic of Cork-Kerry stone circles, which tend to be more architecturally specific than the popular image of a simple ring of upright slabs. Documentary sources also record that a standing stone once occupied the centre of the circle, or close to it, adding a focal point that no longer survives above ground. Roughly 700 metres to the northeast lies a separate five-stone circle, a much smaller monument type common to the same region, suggesting this part of West Cork was a meaningful landscape for whoever shaped it during the prehistoric period.

The stones themselves are modest in scale, ranging from 0.4 to 1.1 metres in height, so this is not a site that announces itself dramatically across open ground. Knowing what to look for matters here: the entrance passage alignment, the variation in stone thickness and length, and the gap on the western side where the fence line interrupts what was once a continuous arc.