35 Castle Square, including railings & gate

35 Castle Square is part of a late Georgian style terrace (numbers 32-37) comprising 3 storeys with an attic and 2-storey basement, constructed in Flemish-bonded brick with mainly graded slate roofs on a moulded wooden cornice. The roofline is finished with small skylights and brick and roughcast stacks. The terrace is built on a steep site.

The composition is arranged across 2+3+8 bays. No 33 provides the focal point, brought forward under a pediment with stucco walls and 3 symmetrical bays, while the other houses have 2 narrow bays each. The basement frontage is coursed rubble stone with single-storey height; windows here are mainly replacements within original openings.

Throughout the terrace, windows are hornless sashes with thin glazing bars set under wedge lintels. Upper storey windows are 9-pane; middle and lower storey windows are 12-pane. No 33's lower storey windows are replaced in original openings. The central entrance portico to No 33 has tapering chamfered square columns on stone bases, replaced double doors with a plain overlight, and a plain cornice with a round-headed attic window containing a 2-light casement.

Doorways to Nos 34-37 are on the left side and to No 32 on the right side. Each has a stucco doorcase with pilasters and consoles beneath a shallow hood, and fielded-panel doors under round-headed radial glazed overlights. No 37 has an added porch; No 35 has glazing inserted into the middle and upper panels of its original door.

No 37 has a roughcast front and a coursed stone stack with corbelled cap dating to 1911. A flat-roofed porch to the lower left contains a 2-centred pointed arch in dressed surround with a boarded door and a pair of narrow lights in each side wall under shouldered lintels. The lower right window sits within an architrave and retains its original 12-pane hornless sash window. The middle storey contains 2 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 retains 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 on this elevation 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 mounted on a dwarf freestone wall. Cellar step gates retain ironwork with a lattice pattern in chinoiserie style, replaced to No 36 and with an added gate to the left side of No 33, though 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 cement-rendered with replaced windows in original openings. The basement has a 2-storey depth.

Internally, the entrance hall is fitted with double panelled doors and an overlight under a segmental arch leading to the stairs. A full-height open-well stair features a wreathed handrail, plain balusters, and moulded tread ends. The basement contains simpler stairs in straight flights.