This narrow tower, now protected as National Monument No. 285, takes its name from a family who lived here during the 18th century, though its history stretches back much further. The Down Survey of 1657 recorded only ‘the stump of a castle’ at Clondalkin, alongside some thatched houses and the famous round tower, which served as a high watch tower for the area.

The structure comprises a well-preserved square tower, rising three storeys high with stepped crenellations at parapet level, complete with a drip-stone ledge and gutter. This service tower is cleverly offset at the corner of what was once a hall house, attached to the northeast corner of a two-storey dwelling. Built from coursed stonework with carefully dressed quoins, the tower measures just over three metres square internally. The south face, which has been rebuilt to secure the building, features three windows; between the two upper floor windows, visitors can spot a projecting boulder that was recorded as a ‘carved head’ by historian Ball in 1899. Access to the tower was originally through the south side, where two large rectangular openings remain visible, with the upper serving as a doorway.

The attached dwelling reveals fascinating defensive features, including possible gunloops on the ground floor and the remains of a stairwell in the northwest corner. A chimney breast with flue on the first floor level suggests the building maintained domestic comfort alongside its defensive capabilities. A gable scar on the south side indicates that a later building once stood against this wall, evidence of the site’s continued occupation and adaptation over the centuries. Though the tower’s interior is no longer accessible to visitors, the exterior remains an impressive testament to the defensive architecture of 16th-century Ireland, standing as a tangible link to Clondalkin’s medieval past.