The rectangular structure, measuring seven metres north to south and nine metres east to west, has been reduced to its ground floor level, with centuries of rubble now filling much of the interior. Farm buildings have since been constructed directly against both the northern and southern walls, incorporating the ancient stonework into the everyday agricultural landscape of rural Ireland.

The tower’s surviving features offer glimpses into its medieval construction and purpose. A garderobe chute, the medieval equivalent of a toilet waste disposal system, can still be seen on the exterior of the north wall; a practical reminder of daily life within these fortified homes. The western wall preserves one of the structure’s most distinctive elements: a narrow, round-headed window that demonstrates remarkable craftsmanship, having been carved from a single massive stone measuring 1.5 metres in height. This wall also retains traces of external plasterwork, suggesting the tower may have once presented a more refined appearance than its current state implies.

While the eastern wall has been completely levelled over time, the remaining structure provides valuable evidence of the tower houses that once dotted the Irish countryside. These fortified residences, typically built between the 14th and 17th centuries, served as both defensive strongholds and comfortable homes for local landowners. The Castletown tower, documented in D. Lavelle’s 1994 archaeological survey of the Ballinrobe district, represents one of many such structures that shaped the medieval landscape between Lough Mask and Lough Carra.