No. 1 St John's Gatehouse

No. 1 St John's Gatehouse is a house at the end of a row, now used as offices, featuring a bridge over Queen Street. It was built in the mid 18th century and early 19th century. The building is constructed of limestone ashlar with slate roofs. The front facing Queen Street is a very narrow single bay, but the property extends across the road bridge, presenting a substantial front to Trim Street.

The structure has three storeys, an attic, and a basement, with all windows being sashes. It features a twelve-pane dormer in a high mansard roof and eight-pane windows at the second and first floors above a six-panel fielded door, which is topped by a deep three-pane transom light. There is a plinth and a platband with "QUEEN STREET" inscribed in fine Roman lettering.

On the north-facing return, there is a full-width arch with responds, an archivolt, and keystones, situated below the twelve-pane dormer. Additionally, there is a twelve-pane window between two blind openings, with a broad flue or buttress at the right angle. A modillion cornice with a blocking course and parapet continues along both sections. The flank wall under the arch is plain, with end responds and a two-pane display window above a basement grille.

The outer frontage features a wide arch under the dormer and a sash window with blind lights, similar to the north side. This part is slightly brought forward from the single bay to the right, which has a further dormer above large sixteen-pane sash windows. The ground floor includes a door with a three-pane transom light on three steps, alongside a late 19th-century two-pane display window, all beneath a continuous wood lintel and a platband inscribed with "TRIM STREET" in fine Roman lettering. The modillion cornice with a blocking course has three dies in the centre section, and the gable ends are coped with deep ashlar stacks.

There is a corresponding single bay to the left of the arch that is not part of the property and is a late reconstruction in matching detail. The interior has not been inspected. This unique bridge feature is an important part of the townscape for both Queen Street and Trim Street.