36 Castle Square, including railings & gate

36 Castle Square is part of a terrace of six houses (numbers 32-37) built in late Georgian style. The terrace comprises 3 storeys with an attic and 2-storey basement, constructed in Flemish-bonded brick with graded slate roofs (except No 32 which has replacement slate) supported on a moulded wooden cornice. Small skylights and brick and roughcast stacks have been added. The building is situated on a steep site.

Number 33 provides the focal point of the composition, brought forward under a pediment with stucco walls and three symmetrical bays, while the other houses have two narrow bays each, creating an overall composition of 2+3+8 bays. The front basements are single-storey in coursed rubble stone with windows mostly replaced in their original openings. Throughout the terrace, windows are hornless sashes with thin glazing bars set under wedge lintels: 9-pane in the upper storey and 12-pane in the middle and lower storeys.

Number 33 has a central entrance portico with tapering chamfered square columns on stone bases. The doors are replaced double doors with a plain overlight, and the pediment contains a round-headed attic window with a 2-light casement.

The other doorways (for Nos 34-37 on the left side and No 32 on the right side) each feature a stucco doorcase with pilasters and consoles beneath a shallow hood, with fielded-panel doors under round-headed radial glazed overlights. Number 37 has an added porch, and No 35 has glazing inserted into the middle and upper panels of its original door.

Number 37 has particular character. Its front is roughcast with a coursed stone stack with corbelled cap dated to 1911 on the right. A flat-roofed porch on the lower left contains a 2-centred pointed arch in a dressed stone surround with a boarded door and pairs of narrow lights in each side wall under shouldered lintels. The window on the lower right is set within an architrave and retains its original 12-pane hornless sash. The middle storey has two oriel windows inserted in the late 19th century on cast iron brackets, each with 4-pane sash windows under a hipped lead roof with swept eaves, carried on cast iron colonnettes. The upper storey retains original 9-pane hornless sash windows in architraves. The basement contains a small-pane sash window.

The right gable end of No 37 was rebuilt in 1911 in coursed dressed stone following the demolition of adjoining houses. Two stone plaques in Welsh and English commemorate Baron Vaynol's gift of land for the investiture of the Prince of Wales in 1911. Each storey has a centrally placed 2-light mullioned window under a mould incorporating 2-light casements, with sill bands 2 courses thick of finely tooled stone.

The forecourt is enclosed by cast iron railings with spear finials on a dwarf freestone wall. The gates to each cellar steps retain ironwork with a lattice pattern in chinoiserie style, though that to No 36 has been replaced and a gate has been added to the left side of No 33. The front door gates are all replaced. The railings terminate at the right end (No 37) with a ramped return wall of coursed dressed stone abutting the house. Steps lead down to cellars beneath the pavement.

The rear is roughcast with windows replaced in their original openings. The building has a 2-storey basement to the rear on account of the steep site.