The middle one of the three is the most modest thing imaginable: a D-shaped enclosure just 1.8 metres across, its curved stone wall still standing around 0.6 metres high, its straight western side formed not by any human construction but by the natural face of outcropping rock. Whoever built here was practical enough to let the landscape do some of the work.

Hut sites of this kind are simple stone-walled shelters, typically associated with transhumance, the seasonal movement of people and livestock to upland pastures during summer months, a practice known in Ireland as booleying. The builders would have used whatever was to hand, and at Ballard Commons that meant incorporating a shelf of bedrock directly into the structure. The wall itself, roughly 0.55 metres thick, is now accompanied by scattered rubble along the perimeter and within the interior, and rushes have partially obscured what remains. What is quietly striking is the clustering: another hut site lies just 10 metres to the south, and a third only 8 metres to the north. This was not a solitary refuge but something closer to a small, seasonal community, three structures close enough that the people using them would have been constantly aware of one another, sharing the rough hill pasture and the same wide view down into the river valley below.