One is circular, roughly 3.25 metres across; the other is oval, measuring about 2.5 by 2.2 metres. The taller of the two reaches only 1.6 metres in height, the other just a metre. They are corbelled drystone buildings, meaning their walls curve inward as they rise, each stone overlapping the one below it, until the opening narrows to a close without the use of mortar or any binding material. It is an ancient construction method found at several sites along this coast, and here it has produced two structures that are modest almost to the point of invisibility, sitting in the field boundary as though the landscape has simply grown around them.

The site was recorded as part of J. Cuppage's 1986 archaeological survey of the Corca Dhuibhne region, a thorough inventory of the Dingle Peninsula that documented everything from promontory forts to souterrains, the underground stone-lined passages sometimes associated with early medieval settlement. The two structures at Fán fit into a wider pattern of corbelled huts found across the peninsula, sometimes interpreted as seasonal shelters for people working upland ground, sometimes as later adaptations of much older building traditions. What their precise purpose was here, and when exactly they were built or last used, the record does not say with certainty. Their position abutting the field wall suggests some integration with an agricultural landscape, though whether they predate that wall or were built alongside it is not clear from what survives.