15 St Peter's Square

15 St Peter's Square is a three-storey building with a stuccoed front, topped by a shallow-pitched slate roof and brick end stacks. The shop front is offset to the left and features a rectangular through-passage to the right. On the first floor, there are two canted oriel windows, while the second floor has four windows. The projecting shop front includes a central splayed entrance with a glazed door and overlight. The shop windows are designed with curved glass at the splays and quarry glazing above the transoms, which also extends to the overlight. The stall board, original fascia, and cornice are preserved.

The upper storey windows consist of transomed wooden casements with quarry glazing above the transoms. The first floor's canted oriel windows are five-light, with flat roofs adorned with dentilled cornices. The second floor features four two-light windows.

At the rear, above the through-passage, the elevation is rendered and has a blocked window opening. To the right, there is a two-storey rear wing made of brick, which has a large four-light window on the ground floor. The upper floor contains a four-pane window with margin glazing on the left, a small six-pane window in the center, and a sixteen-pane horned sash window on the right. To the right of this is a lower brick range, originally a single-storey with a doorway to the right. An added upper storey features three large-pane wooden windows. The gable end has a wide opening with a cast iron lintel and a plain-glazed window on the upper storey. The north side of the rear wing, visible from No 16, displays a variety of windows, including a small-pane sash and a tripartite sash.

The interior has not been seen.