Halkyn Castle and attached Stable Block

Halkyn Castle is a castellated style mansion, dating from the 18th century and possessing two and three storeys with turrets, towers, and numerous chimneys. The exterior is constructed of buff ashlar, featuring chiefly mullioned and transomed windows with hood moulds. The main entrance faces roughly north and is asymmetrical, with three windows on the front, the central one a shallow oriel to the first floor. An ogee-roofed turret is positioned to the right, and a similar turret is incorporated into a projecting gabled block to the left. This projecting block, added in 1886, includes a projecting stack. A single-storey porch fronts the entrance, featuring a four-centred arch, buttresses, turrets with pinnacles, a pierced arcaded parapet, and carvings of a lion and lioness. A panelled door is fitted with elaborate strap hinges. To the left of the porch is a four-light Tudor window, and to the right a mullioned and transomed window.

The east front, originally symmetrical, has a central three-storey projecting bay flanked by castellated turrets. There is a two-light window to the top storey and a splayed two-storey bay window below. To the left are three windows, followed by a pinnacled turret. To the right is a projecting drawing room block, added in 1886, which features a diagonally set gabled two-storey bay window. A single-storey block is located to the left of this elevation, with attached low garden walls. The south elevation includes a three-storey octagonal tower with crenellations and machicolations to the left, and a taller northeast stair turret. To the right of the tower, the elevation steps back via a block with a splayed corner. Single-storey service blocks are also present. Prominent groups of diagonal chimneys are visible from the south. The west elevation, constructed of rubble stone, has a central bay flanked by castellated turrets and 12-pane sash windows.

To the south of the house, screen walls and a stable block form a yard, accessible through a four-centred archway displaying an heraldic shield. The two-storey, three-window stable block has a parapet, a hipped slate roof with two dormers, and paired diagonal stacks. A central broad Tudor arch provides access to the stables and workshop. The sides and rear of the stable block are rendered. Lower blocks feature hipped roofs and large carriage entrances.

The inner porch has double part-glazed doors, leading to a long corridor extending to the rear of the house. A Gothick glazed screen and door lead to the service area. A wooden staircase, built in 1886, is located to the right of the corridor. To the left is a large, asymmetrical drawing room with a panelled ceiling (more elaborate in the 1886 extension), wood panelling approximately one metre high, and two fireplaces with Tudor arches and wooden panelling above. Other ground floor rooms are similarly decorated; the dining room has a panelled chimneypiece by Douglas and Fordham, also dating from 1886.