Outer Gatehouse, former Her Majesty's Prison Gloucester

The Outer Gatehouse, part of the former Her Majesty's Prison Gloucester, was built in 1826 to designs by County Surveyor John Collingwood for the County Magistrates. It is situated on the north side of the prison's perimeter wall and connects to the Grade II listed Perimeter Wall.

The gatehouse is constructed of brick with stone dressings. It is a rectangular block with a central bay serving as a vehicle entrance.

The exterior has a symmetrical facade of three bays on both the north (principal) and south (rear) elevations. The north elevation features a vermiculated, rusticated stone facade, with a plain ashlar plat band above the ground floor and a stone cornice above the first floor, topped by a parapet wall. The central bay is slightly recessed and contains a tall gateway with a semi-circular arched head, featuring double doors and a portcullis above. Flanking the central bay are single 19th-century doors with iron grilles above, set within ashlar frames, and windows behind the grilles. The first floor has two six-light windows on the left-hand bay and two two-light windows on the right-hand bay. The rear elevation is brick with ashlar dressings around the window and door openings, and the arched entranceway. The central bay of the rear elevation projects forward, with blocked window and door openings on the ground floor, and window openings above. The left-hand bay has a blocked ground floor window and a first-floor window. The right-hand bay has a first-floor window.

Inside, the east entrance door has strap hinges. The central entranceway has been enclosed with a first-floor inserted. Remnants of a drop hatch and suspension beam, used for public executions, remain within the archway. An office with a glass partition wall is located on the east side, and two small rooms are to the west. The first floors of the outer bays contain offices and former cells. Interior features include skirting boards, bolection moulded door architraves, an early 19th-century staircase with stick balusters, a moulded handrail, and a square newel post. 20th-century interior fittings are excluded from the listing as they do not possess special architectural or historic interest.