It measures only about three metres across internally, and its walls, where they survive, barely reach knee height. Easy to overlook, easier still to mistake for a natural scatter of rock, it is in fact a booley hut, one of at least ten that survive in a cluster at Cregganroe, each associated with the remnants of a field system on the same ridge.

Booley huts were temporary shelters used during transhumance, the seasonal practice of moving livestock to higher grazing ground in summer. Farmers and their families, typically women and young people, would spend weeks on the upland pastures tending cattle and making butter, living in these small, simply built enclosures while the lower fields recovered. The practice was once widespread across Ireland and is thought to have continued in some areas into the nineteenth century, though its origins are considerably older. At Cregganroe, the hut is constructed in drystone, meaning no mortar was used, just carefully placed field stones. A gap of roughly half a metre on the eastern side may represent the original entrance, though centuries of collapse make that difficult to say with certainty. Moss has colonised both the walls and the stones scattered across the interior, giving the whole structure a quality of slow absorption back into the hillside.