Hm Young Offender Institution, North And East Boundary Walls

The boundary walls of HM Young Offender Institution are located on the north and east sides of the prison complex. They were built in 1848 and later, using Portland stone ashlar or coursed stone. The wall consists of three sections. Starting from the northwest corner of the compound, there is a five-bay section with trapezoidal raised sections over broad flat buttresses on the outside, featuring a segmental link at the west end. This section extends approximately 40 meters to the east and includes a broad gateway with a segmental arch, voussoirs, and a keystone above heavy plank framed doors that serve as the main northern entrance, located just north of the entrance to the east hall.

The wall is about 6 meters high at this point, then drops to a lower level across the full width of the site, where it stands around 5 meters high. This section includes two arched openings with heavy plank doors, one of which is centrally located just north of the Overseer's Hut. At the eastern end, the wall rises again and returns south with a long plain wall parallel to the eastern cell block, concluding with a final canted section approximately 25 meters north of the chapel. These boundary walls are important as part of the overall group of Victorian prison buildings they enclose, although they are interrupted by late 20th-century structures in the southeast quadrant, where significant damage occurred during World War II.