This remarkably compact fortified structure, measuring just 5.1 metres by 4.65 metres externally, may have been one of two castles owned by Roland FitzEustace in 1486. Built from rough limestone rubble with impressively dressed corner stones, the two-storey tower features 0.9-metre-thick walls that taper slightly as they rise, topped with defensive parapets and a projecting stair tower at the northern corner.

The ground floor, accessed through a partially damaged doorway in the east-northeast wall, showcases medieval construction techniques with its barrel-vaulted ceiling that still bears traces of the original wicker centring used during construction. Four double-splayed arrow loops, one in each wall, provide defensive positions and limited light to this lower chamber. Above the vault, beam-slot holes indicate where a wooden loft floor once divided the space. A remarkably narrow spiral staircase, just 60 centimetres wide, winds upward through the northern corner tower, lit by strategically placed loops and windows at different levels.

The first floor reveals a more comfortable living space, entered through a square-headed doorway from the stairs. Two large, square-headed windows with traces of window seats face east-northeast and west-southwest, though both have suffered from stone robbing over the centuries. A fireplace in the north-northwest wall, supported by red brick mantle-supports and served by an external chimney resting on corbels, would have provided warmth to this upper chamber. Though the battlements are now inaccessible, the lower courses of crenellations and gutters remain visible on the projecting parapet, with the stair tower also featuring its own crenellated top. This small but sophisticated tower house has been protected since 2000 under the National Monuments Acts.