Erddig

The present arrangements originated with the late C18 remodelling though many rooms, particularly those on the W side retain earlier panelling. Patent decorative tin ceilings were introduced to some rooms as a fire precaution in the early C20. The ground floor has a suite of rooms on the W side consisting of entrance hall and drawing room both decorated in late C18 Neoclassical style with plaster friezes by Joseph Rose & Co and chimneypieces by John Devall the younger. Library to the N. Entrance hall leads to main staircase on left and back stair to right. Rooms on the E side consist of an oak-panelled saloon; the dining room to S contains a decorative scheme by Thomas Hopper in 1826 containing Doric screens with scagliola columns and a severe Greek Revival coffered ceiling. 2 rooms to the N of the saloon are known as the Tapestry Room and Chinese Room. The latter has roundels of rare C18 Chinese handpainted wallpaper affixed to the walls. This room leads to the family pew in the chapel. Change of level down to the chapel which has furnishings of various C18 dates, some brought from elsewhere. The walls are decorated with a stencilled scheme of 1907-9. Of the windows two are C18 windows by Joshua Price incorporating medieval glass which were brought from Wimpole Hall, Cambridgeshire in the early C20. Upper floor consists of suites of bedrooms on each side of a central long gallery which runs EW giving views of the formal gardens to the E and landscape park to W. The state bedroom on the N side has hand-painted Chinese wallpaper of late C18 date. To the S nurseries now staff accommodation, to the N a suite of family rooms now used for storage and offices. One of these has a fragment of wallpaper designed by Walter Crane. The attic has servants bedrooms.

The basement level has rooms off a long corridor and preserves an axis with family rooms to the N and service rooms to the S. The entrance from the W forecourt leads to a former billiard room known as the Tribes Room which was decorated late C18 with coats of arms of noble Welsh families. Other rooms include the butler's pantry with C18 fittings and fixtures, and the servants hall. Rooms in the S wing include accommodation for the housekeeper and agent. The kitchen range is separately listed.

East front: Red brick with stone dressings and string courses, slate roof hipped to central block, stone chimneys. 2 storeys with basement and attic. Windows are generally 12-pane sashes with casements to the basement. Near-symmetrical elevation which consists of central 9 window block with central pedimented entrance with steps leading up to it, above is a window with a stone architrave, and stone balustrading in the parapet. There is a range of 7 dormer windows in the steeply pitched roof. This block is flanked by 2-window wings with stone quoins, stone plinth to these and central block. Outermost 3-window wings of brick of slightly different colour have sashes to first floor, ground floor left side has a range of 3 bullseye windows with 9-pane sashes below, right hand range ground floor relates to the chapel and has 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 match the inner wings.

W front refaced in ashlar in severe late C18 Neoclassical style; ashlar plinth, 3 storeys. Upper 2 storeys have 12-pane sash windows, ground floor 9-pane sashes. Central projecting 9-window pedimented block flanked by 6-window ranges; the central block has central entrance with doorcase with attached Ionic columns. Perron stone stairs with cast-iron swept handrail. The left hand return side has an entrance with stone doorcase.