This compact defensive structure, measuring roughly 5.9 metres by 3.2 metres, sits slightly offset to the south and west of the main tower’s western corner. Its entrance passage spans 2.45 metres in width and showcases two distinct architectural styles; a segmental arch graces the southwest end whilst a pointed arch marks the northeast entrance.

The gatehouse’s defensive capabilities reveal the careful thought that went into its construction. A murder hole positioned just inside the northeast arch allowed defenders to attack anyone who breached the outer gate, whilst a single drawbar socket, which still contains remnants of its original timber beam, secured the entrance. The murder hole was operated from the first floor chamber above, a modest lintelled room measuring 4.1 by 1.5 metres with a height of 2.65 metres. This defensive position could only be reached through a narrow doorway from the second floor of the adjacent tower house, ensuring that control of the gatehouse remained firmly with the castle’s defenders.

Though time has taken its toll on the upper reaches of the structure, with the parapet now destroyed, evidence remains of how the building once functioned as an integrated part of the tower house’s defences. A small lintelled doorway at the third floor level of the main tower once provided access to the gatehouse parapet, allowing guards to patrol the walls and maintain watch over the surrounding countryside. This surviving gatehouse offers visitors a tangible connection to medieval Ireland’s turbulent past, when such fortifications were essential for controlling strategic locations and protecting important families from rival clans.