12 Castle Square

12-14 Castle Square, known as Paternoster Buildings, is a set of shops with residential spaces above, built in a simplified Baroque style. The building has three storeys and an attic, situated on a corner site with a splayed angle. The roughcast walls are painted cream, and the hipped slate roof has three roughcast chimneys.

The facade facing Castle Square features three paired bays, with rusticated pilasters on the lower storey and full-height Corinthian pilasters on the middle and upper storeys. A broad entablature below the eaves displays the name 'Paternoster Buildings' in raised letters. The windows on the middle and upper storeys have architraves. In the left-hand bay (No 12), there are renewed four-pane sash windows; the central bay (No 13) also has four-pane sashes, while the right-hand bay (No 14) contains windows that have been replaced within the original openings. Both the central and left-hand bays feature two segmental-headed roof dormers with opening lights. The left and right bays have late 20th-century shop fronts. The central bay (No 13) shop front includes half-glazed panelled doors on the right and left, a window with glazing bars, and round vents on the stall board, though the fascia has been replaced.

To the right, there is a narrower single-window splayed corner bay, followed by a bay facing Bridge Street that has replaced tripartite windows, featuring pilasters similar to those on the Castle Square elevation. At the rear, there is a single bay facing Lon Crwyn, ending with a pilaster that matches the main elevations. Beyond this, the rear has five windows, most of which have been infilled.