What remains today is a small rectangular tower, about five metres north to south and four metres east to west, rising two storeys high with sections of wall extending southward. The tower’s ground floor contains a tiny vaulted chamber, just over a metre square, accessible through a crumbling opening in the western wall and lit by a narrow slit window. Above, the first-floor chamber is slightly larger and more refined, entered through a lintelled doorway and originally illuminated by single windows on three sides, though the eastern opening has since been enlarged considerably. The room features a distinctive rounded wicker-centred vault, a construction technique typical of late medieval Irish buildings.

The surviving walls tell a story of constant adaptation and change. A substantial wall runs south from the tower for over 15 metres, incorporating various architectural features from different periods; a pointed arch doorway visible in photographs from 1907, blocked openings at various levels, and the upper portion of a twin-light window with ogee heads and hood moulding that speaks to the building’s former elegance. Evidence of cross-walls and a fireplace recess suggest the castle once extended considerably westward. Samuel Lewis, writing in 1837, described Lombard’s Castle as a quadrangular building with square towers at each corner, placing the surviving tower at what would have been the northeast angle. The 1842 Ordnance Survey map supports this grander footprint, showing structures extending roughly 18 metres east to west and 40 metres north to south.

Built in the late 16th or early 17th century, the castle served as the mansion of the wealthy Lombard family, who likely inhabited it until the 1730s. Following their departure, the building found new purpose as a school throughout the 18th and early 19th centuries, before being reduced in size and restored by Reverend Buckley in 1886. A drawing by antiquarian John Windele from around 1851 shows the building much as it appears today, complete with a gable at the southern end and two tall chimney stacks that have since disappeared. Despite centuries of alterations, demolitions, and repurposing, Lombard’s Castle remains a tangible link to Buttevant’s past, when powerful merchant families built substantial townhouses that doubled as defensive structures in Ireland’s turbulent early modern period.