18 Castle Street

16 and 18 Castle Street are two-storey buildings with attics that form a group. They feature four continuous gables at the front, which project from an earlier cross-range. The gables are symmetrically arranged, with wider outer gables flanking paired narrower and shorter central gables. Each house has two gables with openings that are asymmetrically arranged. The buildings are rendered and lined on a plinth, topped with slate roofs. There are four brick ridge stacks located at the angles of the gabled bays and the cross-range, with the one on the right having been renewed. Each gable has cusped barge boards and a finial, along with raised quoins at the outer angles. The window openings are in raised surrounds, primarily featuring 16-pane sash windows. Each gable also has an attic window, which is a small-pane horizontal sliding sash.

The entrance to each house consists of a pedimented doorcase, with the open pediment supported by fluted pilasters and moulded capitals. This doorcase contains a six-panel door beneath a four-pane overlight with gothic glazing.

No 18 is on the left. Its entrance is located to the left of the center and is flanked by one sash window to the left and two to the right. To the far left, there is a doorway leading to a through-passage with a moulded frame, which contains a decorative cast iron gate. The first floor has a horizontal sliding sash window above the entrance, and 16-pane sashes that align with the windows below. The rear of the buildings is not visible, but it is noted that No 18 has a long rear wing similar to No 16. The interior has not been seen.