It is built entirely without mortar, a technique known as drystone construction, in which carefully selected and arranged stones hold each other in place through weight and friction alone. The hut measures 3.4 metres in diameter and survives to a height of 1.25 metres, with walls roughly a metre thick. Its entrance opens onto the north-western side of the yard it shares, suggesting a deliberate orientation or simply a practical response to the terrain and prevailing conditions of the mountain.

The site was recorded as part of the Corca Dhuibhne archaeological survey of the Dingle Peninsula, published by J. Cuppage in 1986 under the auspices of Oidhreacht Chorca Dhuibhne, a survey that brought together a remarkable density of early remains from one of the most archaeologically complex landscapes in Ireland. Brandon Mountain itself has long associations with early Christian and pre-Christian activity, and small stone enclosures and hut sites of this kind are characteristic features of the peninsula's upland zones, though the precise function and period of any individual structure can rarely be established from surface remains alone. Whether it served as seasonal shelter for those working the mountain, as a component of a small agricultural enclosure, or as something older and harder to categorise, the structure at An Tseanchoill does not readily give up its purpose.