Napier House

Napier House is an 1830 building that originally served as an armoury and barracks, and is now used as offices. It is constructed from Bunter sandstone ashlar and features a slate roof with lead flashings. The building has three storeys and a central spinal corridor with barrack rooms on either side.

The north front has 11 bays with slight projections at both ends. There is a rusticated moulded string course between the ground and first floors, and a band with sunken panels and moulded surrounds between the first and second floors. The central ground floor door has a moulded surround, flanked by windows with three sets of two sash panes, along with two sets of 20th-century double doors at the extreme right and the third bay from the left. The first-floor windows consist of four panes by six panes, while the second-floor windows are similar but shorter in height. Above, there is an entablature topped by a plain parapet with a raised panel in the center.

On the left side, there are three bays with string courses, a parapet, and an entablature that continue around the building. The ground floor has double 20th-century doors on the left, with sash windows of three by two panes to the right. The central windows on the first and second floors are blocked, while the lateral windows have four by six panes, similar to those on the north front.

The right side has three ground floor window surrounds, all of which are now blocked, with the central one raised. The central first-floor window is also blocked, with sash windows of four by six panes on either side.

The south front is adjacent to the raised walkway of the Inner Bailey walls, which places the ground floor in a lower area. It features eleven bays with two-bay projections at both ends, mirroring the north front. There are double doors in a moulded surround with a rectangular overlight at first-floor level, accessed by a flying staircase that rises from the raised walkway of the walls.