This small rectangular structure, measuring 10.5 metres east to west and 8 metres north to south, rises two storeys from the undulating grassland. Built from roughly coursed limestone blocks with walls 1.6 metres thick, the tower shows its age through partially robbed base batters and weathered stonework. The main entrance, featuring a rounded segmental arch with a bolt hole for security, can be found at the eastern end of the north wall.

The interior reveals typical defensive architecture of its era, with the first floor supported by wooden beams rather than the more expensive stone vaulting found in grander towers. Windows at the first floor level display the characteristic rounded splays of medieval construction, complete with narrow slit openings and built in window seats where defenders could position themselves. Through the thick covering of ivy, traces of battlements remain visible along the western and eastern walls, whilst the foundations of what appears to be an angle tower, possibly serving as a garderobe tower, survive at the southwest corner.

Surrounding the tower house to the north and west, a low circular earthwork hints at the remains of a levelled bawn wall, the defensive enclosure that would have protected the tower’s immediate grounds and any associated buildings. This earthwork, catalogued separately in archaeological records, suggests the site once formed a more extensive fortified complex typical of Anglo-Norman settlements in medieval Ireland. Despite its ruined state, Clonmore Castle remains an evocative reminder of the network of small fortifications that once dotted the Irish midlands.