Officer'S Block B

Officer's Block B is a building originally designed for officers' accommodation, now part of prison accommodation. It was constructed around 1865, possibly by Captain W. Crossman, Royal Engineers, who was the general designer of The Citadel. The building is made of Portland stone with heavily rusticated roach stone on the ground floor and ashlar on the first floor, topped with a slate roof.

It has a flat 'H' plan with the main axis running north to south, featuring a single-storey central porch on the west side and a two-storey service unit located centrally to the east. The structure is two storeys high with a window arrangement of 2:5:2. All windows are plate-glass sashes set in arched heads, surrounded by bold rusticated surrounds with keystones. The north end consists of three bays, with all openings blank except for the centre of the ground floor. There are arched doors leading to the west porch. The building features a plinth, a first-floor band, a heavy modillion cornice, and a blocking course, with cills that are approximately 300mm deep and have a central roll-mould.

Flanking the building on the east and west sides are blast bunkers, contributing to its vigorous presentation, although the overall design is controlled. The interior of the building is not available for inspection.