Two sets of house foundations, and possibly a third, survive within the enclosure, their stones now moss-covered and overgrown but still legible enough to be measured and mapped. That ambiguity of date is not a gap in the record so much as a condition of the place itself: the structures are real, but when people lived here, and for how long, remains open.

A ringfort, to use the common shorthand, is a roughly circular enclosure defined by an earthen bank or stone wall, typically associated with early medieval settlement in Ireland, though some were built earlier or later. The Eastwell example contains at least two structures pressed against the inside of the enclosing bank. The first abuts the bank on the south-east side and forms a subrectangular footprint running north to south, roughly 7.2 metres long and 4.2 metres wide, its south, west, and north sides defined by large limestone blocks. The second, on the southern arc of the bank, is smaller, roughly 4.2 by 3.8 metres, irregularly shaped, and composed of smaller limestone blocks; it is more overgrown and less well preserved than its neighbour. A third possibility sits towards the south-east of the interior, where two contiguous stretches of low walling meet at an L-shape, the longer arm running nearly 9.8 metres and the shorter extending about 5.6 metres eastward. Whether this represents a separate house or simply an internal partition within the ringfort is a question the stones themselves decline to settle.