Refurbishment of dormer windows to side and rear; restoration of front entrance steps and low height side walls and capping; replacement of windows and rooflight and installation of secondary glazing; internal alterations at ground and first floor levels, and associated refurbishment works. (Linked to 21/08207/FULL)

Internal alterations at all levels to reconfigure layouts and external alterations to the eastern lightwell including the replacement of three timber sash windows with three traditional timber glazed doors, new plant area at roof level within an acoustic enclosure and new dormer windows at roof level.

Erection of rear extension, formation of lightwell and associated excavation to lower ground floor level; glazed conservatory at rear ground floor level with associated balcony and stair; partial demolition of existing closet wing and replacement with raised roof level; installation of dormer window, roof light and AC units at roof level and associated works. Internal alterations, including changes to planform.

Amalgamation of third floor and fourth floor flats into a single unit, with external alterations on the fourth floor to replace sash windows within the existing dormer to the front and extension to the existing dormer at the rear onto terrace. New railings. Internal alterations include replacing walls. (Linked with 21/06432/FULL)

Replacement of dormer windows and enlargement of side dormer window; erection of glazed extension to rear first floor level; replacement rooflight; replacement of rear ground floor windows with timber windows and first floor rear window with French door; replacement of second floor stair; replacement secondary glazing to front elevation windows; layout alterations; and associated works. (Linked with 21/04369/FULL)

Variation of condition 1, condition 4 (parts a, d, e, g, h, I, j, k) and condition 5 (parts i, iv, v, vii, viii, x) and the removal of condition 4 (parts b, c, f), 5 (parts ii, iii, vi and ix) and 8 of listed building consent dated 3 December 2020 (RN: 20/03709/LBC), which itself varied Condition 1 of listed building consent dated 3 April 2018 (RN: 17/10530/LBC) for 'Alterations to the existing building including removal of existing roof top plant and extension to create an additional storey at fifth floor with tiled mansards and lead clad dormer windows to front and rear; a single storey extension at fourth floor comprising a glazed dome above the existing rear bow; installation of plant at roof level; partial infilling of lightwell adjacent to Gwydyr House; facade cleaning and other facade repair; internal alterations including reconfiguration, fabric removal, and refurbishment works on all floors; refurbishment of meetings rooms, entrance reception and offices; installation of new heating and cooling equipment; provision of a glazed research pod in the library; installation of light-boxes above the central stair and library, and other associated works'. Namely, to allow amendments to the approved scheme that include the installation of a proposed smoke extract system to mechanically ventilate new smoke lobbies to the secondary staircase; the removal of the lift access to the new fifth floor level and associated rooftop overrun; internal alterations at fourth and fifth floor levels; and alterations to ducting at roof level.

Erection of an additional storey on both existing rear extensions, replacement of the existing pitched roof at rear with a mansard roof with addition of a second dormer to the new roof, replacement of the existing dormer windows at the front facade, tanking of the vaults at the front of the property, and internal alterations.

Internal alterations at basement, ground, and first floor level including works to the staircase between basement and ground floor levels and the removal of partitions; installation of a new front dormer window.

Erection of rear extension at lower ground floor level and associated excavation to lower ground floor level; glazed conservatory at rear ground floor level with associated balcony and stairs; partial demolition of existing closet wing and replacement with raised roof level; installation of dormer window, roof light and AC unit at roof level and associated works. Internal alterations, including changes to planform.

Amalgamation of the ground and first floor maisonette, with the second floor flat, the third floor and part of the fourth floor penthouse to create a single family dwelling house, creation of separate self-contained four bedroom flat at fourth floor level (accessed via 19M Hyde Park Gardens). Demolition of existing extension at ground and first floor, installation of replacement windows at ground, first, second and third floors, demolition of crittal doors and terrace at fourth floor and roof level, erection of mansard roof with dormer windows and parapet, demolition of roof access and rendered chimney and erection of lift motor room at roof level. Internal alterations and refurbishment, including the reinstatement of original features throughout including fireplaces and joinery details, reinstatement of spiral stair from lower ground to third floor, demolition of lowered ceilings, removal of a twentieth century stair and addition and removal of partitions (linked to 20/08322/FULL).