18 and 18a, Upper Borough Walls

No. 18 and 18A Upper Borough Walls is a house with shops, built in the mid-18th century, with later additions from the 19th and 20th centuries. The building is constructed from limestone ashlar, and the roof is not visible.

It is two storeys high with an attic over a basement, featuring a principal front facing Trim Bridge. This front has a Palladian pediment and a Venetian window on the first floor, supported by a moulded sill on four consoles and topped with a modillion cornice. A plat band at the first floor displays the inscription 'TRIM BRIDGE' in fine incised Roman lettering, while other inscriptions (SMP, SPPP) indicate parish boundaries.

On the ground floor, there is a six-panel door to the left, which is set in deep reveals and accessed by three steps. This door is framed by a moulded architrave with a pulvinated frieze and cornice. The late 19th-century shopfront features a tripartite window, fascia, and dentil cornice. The plinth includes three basement light heads with splayed surrounds.

The tall attic, which is a later addition, has three plate glass sash windows, a small cavetto cornice with a blocking course, and a flat roof. The long return to Upper Borough Walls, which runs parallel to the city wall, is simpler in design. It has seven windows arranged in a three-one-three pattern: the left trio on the first floor includes a blind central opening flanked by plate glass sashes, while the right trio has a plate glass sash window with blind windows on either side. The ground floor features a small square display window with a panelled door and transom light on the left, and a poor display window from the late 20th century on the right. There are two plate glass sashes to the right of the attic beneath the cornice. The returned end is plain and built of rubble, overlooking a former burial ground that was located just outside the city walls.

The interior has not been inspected. This building showcases a fashionable Palladian exterior and serves as a prominent corner feature in this area outside the city walls, reflecting the influence of the elder John Wood.