Coltness Gatehouse, Main Street, Wishaw

Coltness Gatehouse, located on Main Street in Wishaw, is a former gatehouse built in the mid-19th century. This two-storey, two-bay structure is designed in the Jacobethan style and is now used as public toilets. It features polished ashlar sandstone and includes a three-stage belvedered square tower with an oriel window. The building has a base course, a broad corniced dividing band between the first and second floors, and an eaves course with a cornice. It also has projecting quoins, strap work parapets, and balustrades.

The principal elevation on the southwest side is asymmetrical, showcasing a three-stage advanced square tower to the right. There is a small semicircular arch niche at the ground level with a basin, and blind arches on the returns. The first floor features a bipartite stone-mullioned and transomed bowed oriel window with a mask boss and corbel. The belvedere has paired and pilastered semicircular arches with Tuscan capitals. To the left, there is a blind window in a projecting surround with a scrolled pediment, and at the center of the first floor, a small semicircular arched window with a roll-moulded reveal, plain architrave, and flanking roundels with shields.

The northeast (rear) elevation has a large battered wallhead stack at the center, with a small window on the first floor at the far left. There is a gabled single-storey wing advanced to the right, which features a scrolled pediment above later extensions and a blind oculus in the gablehead.

The southeast (side) elevation is adjacent to another building. The northwest (side) elevation is asymmetrical and has three bays. The center bay is recessed with a plain entrance, while the right side has a two-storey gabled bay with a canted window at the ground level and a pilaster-framed window at the center of the first floor, topped with a consoled, broken segmental pediment. The left side features a single-storey bay with a bipartite stone-mullioned window projecting to the center.

The windows are a mix of plate glass and four-pane timber sash and case styles. The roofs are gabled with grey slate and lead flashing, and they have coped skews with kneelers, skewputts, and finials. The building also includes cast-iron rainwater goods. The interior has been converted for use as municipal toilets.