The square, two-storey building measures 7.7 metres across with walls 1.4 metres thick, featuring a slight outward slope at its base for added stability. Just 5.5 metres to the east lies Cashelboy church, creating a small but significant medieval complex in this rural landscape.

The tower’s interior reveals the defensive mindset of its builders. Enter through the south end of the eastern wall and you’ll find yourself in a barrel-vaulted ground floor chamber, with a loft space tucked above. A spiral staircase immediately to the north of the entrance winds upward, illuminated by narrow defensive slits; one at ground level and two more at the first floor. The stairwell leads to the main living quarters above, where the architectural details become more intriguing. Hidden passages run through the thick walls themselves: one in the south wall leads to a garderobe in the southwest corner, whilst another passage beginning in the northeast angle terminates in an oubliette, a particularly grim feature centred in the eastern wall where prisoners could be dropped and forgotten.

Despite its defensive nature, the first floor shows signs of relative comfort with multiple windows bringing light into the living space. The eastern wall features a large round-headed window with its original late 16th century stonework still intact, whilst a small slit opening pierces the northern wall. The western and southern walls once held flat-headed single-light windows, now broken out, and large rectangular niches flank the windows in both the western and northern walls, likely used for storage or seating. Interestingly, there’s no evidence the tower ever rose beyond these two storeys or featured battlements, suggesting it may have been topped with a simple pitched roof rather than the crenellations typical of earlier medieval fortifications.