The walls, standing about 4 metres high with a thickness of 1.6 metres, retain fragments of their medieval character despite centuries of weathering. At the southwest corner, the remains of a rectangular corner tower still stand, though only its western and southern walls survive; these project beyond the main curtain walls, extending 0.75 metres on the west side and 2 metres on the south.

The tower’s ground floor features a double-splayed slit window in its western wall, whilst the southern wall contains a curious pair of pointed-arch recesses, each about 1.5 metres high and 1.6 metres wide. These small chambers, fitted with metal and wood doors, are said by locals to have served as bee-boles, though evidence of rebuilding on the exterior suggests they were originally slit windows. The northern curtain wall shows signs of what may have been the castle’s main entrance; a 4-metre-wide breach midway along the wall preserves traces of an ingoing on its western side. Windows punctuate the remaining walls in various states of preservation, from simple lintelled lights with sockets for glazing bars in the eastern wall to square-set arched embrasures with window seats elsewhere.

The eastern curtain wall preserves perhaps the most domestic feature of the castle: the remains of a fireplace positioned midway along its length. Its northern side still projects slightly into the interior space, topped with part of a segmental arch that retains evidence of its original plank-centring, though the outer wall has long since collapsed. Historical records indicate this was a Condon castle that passed to the Sherlock family in the late 16th century, marking its transition from medieval stronghold to early modern residence. Today, whilst much of the northeast and southeast corners have fallen away and ivy obscures many architectural details, Leitrim Castle remains an evocative reminder of Cork’s medieval landscape.