Boundry Wall to Island House

The boundary wall to Island House is a high wall that runs southwest towards the grist from the front gable-ended cross range, extending forward to the street, with the top courses bonded in. It features a slate coping or roof and a brick chimney stack. The wall then turns southeast and runs along the northeast side of the grist, where there is a modern opening to a modern house that is not of special interest. The wall curves back towards the castle, stepping down in front of the modern house and rising again at the end of the Island House garden. This section of the wall has a plaque that reads, "This wall was rebuilt by Maryabra Hughes Skyrme AD 1837."

At the northeast corner, the base of a cylindrical tower has been converted in the early 19th century to a gazebo, although it is now in poor condition. The wall then turns northwest along the River Coran to a rubble two-storey structure with a corrugated roof, which adjoins the ornamental gothic gate tower to Island House. This structure is now a garage but is said to have formerly contained living accommodation. It retains a pendant at the gable end, with freestone quoins and brick surrounds to the northeast side windows.