The stony footings, worn down to no more than a metre at their highest point, trace a building roughly twenty-two metres long and twelve metres wide, oriented west-south-west to east-north-east. There was probably an entrance in the east wall, apparently fitted with a forebuilding, a small projecting structure designed to protect or control access, and a separate ancillary chamber occupied the south-west corner. A further, slighter trace of another possible structure lies to the west of the castle proper. None of this survives in any dramatic sense; it is the kind of archaeology that rewards attention rather than announces itself.

The remains sit in the townland of Ráthanáin, recorded in J. Cuppage's 1986 survey of the Corca Dhuibhne archaeological landscape, a detailed inventory of the Dingle Peninsula's extraordinary density of monuments. The building's relationship to Rahinnane Castle suggests it formed part of the wider complex associated with that site, functioning perhaps as an ancillary structure of some kind, though the precise nature of that function is not established. The defacement of the footings, a term that simply means the stonework has been disturbed or reduced over time, makes close interpretation difficult. What the ground plan does preserve is the general shape and scale of something that once stood here as a deliberate, organised piece of construction.