Northallerton Police Station

This is a mid-to-late 18th century house, later used as local authority offices and converted into a police station in 1987. The building is constructed of pink/brown brick in both English and English garden wall bond, with Westmorland and Welsh slate roofs. It has an L-shaped plan, with a wing extending to the rear right. The facade is arranged with 2 storeys and consists of 1:3:1:3:1 bays. The outer bays are slightly recessed, although they may have once projected further.

The main block features English bond brickwork and a Westmorland slate roof. It has sill bands to both floors, and a moulded cornice. The central part has a 4-panel door with a fanlight incorporating Gothic glazing bars, set within a portico with Roman Doric half-columns and a patera on each frieze, supporting an open pediment. Above the doorway is a semicircular staircase window divided into three sections by wooden mullions, with a header arch. Flanking the semicircular window are tripled canted bays with 4-pane sash windows, flush exposed sash boxes, and flat arches. A hipped roof covers the main block and extends to the canted bays. The end bays of the main block each have a matching 4-pane sash window on both floors. In the outer corners are doors: the one on the left has six fielded panels, and the one on the right has four, both set below blocked overlights with intersecting glazing bars, and within Tuscan doorcases. Moulded cornices and hipped Welsh slate roofs top these end bays. Chimney stacks are located at the ends of the main block.

The rear of the building has an irregular plan with windows of varying types. The left return features a studded and vertically boarded door set within a 19th-century ashlar surround with a pointed arch. The spandrels below the arch are blank shields, and there is a hood mould above. To the left of the door is a 2-light mullion window with round trefoiled lights and a hoodmould. Further to the rear is a ground-floor sash window.

Inside, the entrance hall has 19th-century encaustic floor tiles. The staircase is from the mid-to-late 18th century, with column-on-vase turned balusters. It was originally an open-well design but has since been compartmented. Two elliptical arches with fluted architraves lead from the stair hall to the rear corridors on both floors. The stair hall cornice features fluting and acanthus leaves. The rear corridors feature round arches with fluted architraves. First-floor doorways have fielded-panel linings and original architraves, although the doors themselves have been replaced.