Her Majesty's Prison: Main entrance and two flanking wings

Her Majesty's Prison features a main entrance and two flanking wings, constructed between 1848 and 1849 by Thomas Smith. The building is made of Flemish bond red brick with slate dressings and has slate hipped roofs with brick axial stacks.

The layout includes a central entrance block with a carriageway and wings attached only by a prison wall at the back. The exterior is two storeys high with basements, showcasing a three-bay central entrance and flanking wings, all adorned with rusticated stone quoins, plinths, string courses, and cornices. The central entrance has advanced outer bays with a pediment, a round arch carriageway featuring vermiculated rustication on the voussoirs and large double doors. It also has two-light windows with flat arches made of large voussoirs and stone mullions. The flanking wings have pedimented centres that project forward, with recessed round-headed doorways that include keystones, fanlights, glazed doors, and steps with iron balustrades, along with twelve-pane sash windows topped with flat brick arches.

The interiors have not been inspected. Notably, Bedford Prison was originally built in 1801 to designs by John Wing and was later extended in 1848-9, during which the perimeter walls and front entrance were rebuilt, and the flanking wings were added by Thomas Smith, who served as the County Surveyor for Hertfordshire and Bedfordshire.