Barracks at Fort Williamsburg

The Barracks at Fort Williamsburg is a two-storey building with a roughly horseshoe shape, constructed from local rubble and mostly roughcast on the exterior, topped with a slate roof. It features red brick chimney stacks with toothed cornices similar to those found on the Armoury. The entrance front is gabled, showcasing an immensely tall round-headed arched entry that leads to a deeply recessed and much lower door. At the apex, there is a gabled bellcote containing a bell cast by Mears of London Founders.

To the right of the entrance, there are two horned 9-pane sash windows, while to the left are two slit windows with lozenge-paned glazing. The main accommodation ranges are angled back on either side, surrounding a small courtyard. On the outer side, to the right of the entrance, there is a lozenge-paned window followed by a corner elevation featuring a central gabled chimney breast flanked by various windows and a doorway with a bracketed cornice, a boarded door, and a 4-pane overlight. The first floor has sash windows, with the right window being small-pane, and the ground floor includes a similar 2-light casement window to those on the back of the Armoury. The elevation to the left of the main entrance is similar but not roughcast.

The main door, which has slate-dressed reveals, opens into a tunnel-passage that arches into the courtyard at the far end. Above this inner arch is a boarded loft door. The rubble elevations include red brick jambs and infill from different periods, with some brick appearing to be from the later 19th century. There are various small-pane sash windows, mostly 12-pane on the first floor and 16-pane below, although there are tripartite windows on either side of the entrance. One doorway has a bracketed cornice, and there is an added lean-to porch. A cast-iron hand pump remains opposite the entrance.

The fort itself is roughly square in shape, featuring redans at the four corners and surrounded by ditches and revetment walls.