Erddig

Erddig is a substantial house built in red brick with stone dressings and a slate roof. The building is arranged around a central block with flanking wings, creating a complex composition that reflects its evolution over time.

The east front presents the most ornate elevation. It is constructed in red brick with stone dressings and string courses, with a slate roof hipped to the central block and stone chimneys. The design is two storeys with basement and attic storeys. Windows throughout are generally 12-pane sashes with casements to the basement level. The elevation is near-symmetrical, centred on a 9-window block with a central pedimented entrance approached by steps. Above the entrance is a window with stone architrave, and stone balustrading runs across the parapet. The steeply pitched roof contains a range of 7 dormer windows. This central block is flanked by 2-window wings with stone quoins and a stone plinth. The outermost 3-window wings are of brick in a slightly different colour, with 12-pane sashes to the first floor. The ground floor on the left side features a range of 3 bullseye windows with 9-pane sashes below them. On the right, the ground floor relates to the chapel and contains a single bullseye window with a square-headed window beneath it on each side of a tall central arched window. The window levels do not align with those of the inner wings.

The west front was refaced in ashlar in the severe late 18th-century Neoclassical style. It has an ashlar plinth and three storeys. The upper two storeys contain 12-pane sash windows, while the ground floor has 9-pane sashes. The composition consists of a central projecting 9-window pedimented block flanked by 6-window ranges. The central block features a central entrance with a stone doorcase framed by attached Ionic columns, accessed via perron stone stairs with a cast-iron swept handrail. A secondary entrance with stone doorcase is located on the left-hand return side.

The interior arrangements largely originated with the late 18th-century remodelling, though many rooms, particularly those on the west side, retain earlier panelling. Early 20th-century patent decorative tin ceilings were introduced to some rooms as a fire precaution.

The ground floor west side comprises an entrance hall and drawing room, both decorated in late 18th-century Neoclassical style with plaster friezes by Joseph Rose & Co and chimneypieces by John Devall the Younger. A library is situated to the north. The entrance hall connects to the main staircase on the left and the back stairs to the right. The east side contains an oak-panelled saloon. The dining room to the south features a decorative scheme by Thomas Hopper dating to 1826, containing Doric screens with scagliola columns and a severe Greek Revival coffered ceiling. Two rooms to the north of the saloon are known as the Tapestry Room and Chinese Room. The Chinese Room displays roundels of rare 18th-century hand-painted Chinese wallpaper fixed to the walls and leads to the family pew in the chapel. A change of level descends to the chapel, which contains furnishings of various 18th-century dates, some brought from elsewhere. The walls bear a stencilled decorative scheme of 1907-9. Two of the chapel windows are 18th-century work by Joshua Price incorporating medieval glass; these were brought from Wimpole Hall in Cambridgeshire during the early 20th century.

The upper floor consists of bedroom suites on each side of a central long gallery running east-west, which offers views of the formal gardens to the east and the landscape park to the west. The state bedroom on the north side is hung with hand-painted Chinese wallpaper of late 18th-century date. To the south, the nurseries are now staff accommodation. To the north, a suite of family rooms is now used for storage and offices; one of these retains a fragment of wallpaper designed by Walter Crane. The attic contains servants' bedrooms.

The basement level is arranged along a long corridor, preserving an axis with family rooms to the north and service rooms to the south. The entrance from the west forecourt leads to a former billiard room known as the Tribes Room, decorated in the late 18th century with coats of arms of noble Welsh families. Other rooms include the butler's pantry with 18th-century fittings and fixtures, and the servants' hall. The south wing contains accommodation for the housekeeper and agent. The kitchen range is separately listed.