11a, 11b and 13, Upper Northgate Street

Nos. 11A, 11B, and 13 on Upper Northgate Street are a pair of mid-18th century townhouses that have been converted into a shop and four flats. They are constructed of brown brick in Flemish bond and feature a pair of hipped grey slate roofs that are positioned at a right angle to the front. The building stands three storeys tall and consists of four bays.

The ground floor includes a recessed colonnade supported by rusticated end piers and three unfluted Roman Doric columns in between. The upper storeys have rusticated quoins and modern shopfronts. An inserted door on the north side has two rows of three panels. The upper floors feature flush sash windows with moulded sills, rusticated wedge lintels with false keystones, and louvred shutters that are likely functional. There are four 12-pane sash windows on the front and one at each end on the first floor, and four 6-pane sash windows on the front and one on each end on the second floor. The building is topped with a full cornice and has two lateral chimneys on each side, with the stacks on the south side having been rebuilt.

Inside, there are stone steps leading to flat-ceiled cellars. The ground floor contains an opening for an old open fireplace with an oak bressumer against the south wall, along with an oak chamfered cross-beam. The upper storeys could not be inspected.