A cashel is a type of early medieval stone enclosure, essentially a circular fortified farmstead, and this one contains what appears to be a later addition: a grass-covered rectangular building measuring roughly 8.5 metres long and 5.5 metres wide, with entrances set opposite each other at the north-west and south-east. A further stone wall runs across the cashel interior from north to south, meeting this structure at its south-western side. Everything is grassed over now, softening the stonework into gentle ridges in the ground.

What makes the structure quietly curious is how it sits in relation to the cashel around it. Rather than being part of the original enclosure, it is thought to be a later feature, possibly inserted into the cashel at some point after the enclosure itself was built and perhaps already abandoned or repurposed. Archaeologists have suggested it may have served as an animal shelter, a mundane enough function, but one that points to a long afterlife for the site. People continued to find the old enclosure walls useful long after whatever community first raised them had gone, adapting the space for their own practical needs. The opposing doorways would have allowed livestock to be moved through easily, which fits the shelter interpretation reasonably well.