Perimeter walls of Beaumaris Gaol

The perimeter walls of Beaumaris Gaol are made of coursed freestone and stand approximately 15 meters high, enclosing a space that measures 55 meters by 32 meters. The walls feature freestone coping and have a slight batter at the base. Each side includes shallow buttresses that rise to three-quarter height and are clasped at the corners.

The main entrance is located on the north side, facing Bunkers Hill, and is framed by splayed sections of the perimeter wall that connect to the main prison building. This entrance consists of four lower freestone piers with central double iron gates, flanked by bays with railings on dwarf walls.

On the south side, the wall is higher and constructed in two steps to accommodate an extension to the south wing that was made in 1867. A doorway with a concrete surround and a boarded door was later inserted in this section of the wall. On the east side, there is a wider buttress to the right of center, which features a studded door at the top; this is where the gallows was fixed. Additionally, on the inner side of the wall at this location, there is a bell topped with a wooden cross.

The inner side of the wall is pebble-dashed, except for the southwest quadrant where the original stone is exposed.