Castle Chambers including area railings

Castle Chambers is a terraced house dating from the 18th century, featuring painted stucco with imitation slates on the roof, which has moulded eaves and end stacks. The left side is constructed of red brick, while the right side is large and roughcast. The roof is continuous with that of No 7 and is considerably higher than No 5. The building is set on a terrace above street level and consists of three storeys and a basement, with three bays.

The upper floors have renewed small-paned sash windows, with square 9-pane windows on the top floor and 12-pane windows on the first floor, all featuring painted slate sills. The ground floor has later 19th-century details, including a central doorway with a stucco surround, panelled tapering piers, a panelled lintel, a cornice on consoles, and a metal curved hipped roof above the cornice. The entrance features a six-panelled late Georgian door with flush panels and two glazed sections, along with a hand-and-wreath knocker. There is a canted bay window with a metal curved hipped roof and plate-glass sash windows on each side.

In front, there is a rendered platform with wrought iron spearhead railings and cemented steps leading up from the left. The platform is interrupted on the right for access to a basement door located beneath the right-hand bay window. At the rear, a side wall projection above the first floor, visible from the back of No 7, may be a truncated chimney breast.

Inside, the central hall features 18th-century fielded panelling up to the dado and a plain cornice. The hall arch is supported by large scrolled consoles and has a moulded arch with a keystone, shell motifs in the capitals, and a panelled soffit divided into four panels with rosettes. The staircase to the attic consists of four flights, with a closed string, turned balusters of the column-on-vase type, columnar newels, and a moulded ramped rail, along with panelled dado.

The right room on the ground floor has fielded panelled dado, a plain shouldered 18th-century fireplace surround, framed panels on the walls, and a finely moulded cornice. The left room is subdivided and retains some dado panelling and cornice with 18th-century mouldings. Six-panel doors are generally found throughout, including on the first floor. The dado panelling in the front first floor room was not available for inspection in 2004. The staircase features a cornice over at the second floor, and the top landing rail is ramped down at both ends.