Variation of 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 vary the approved drawing numbers to make amendments including a reduction in size of the glazed dome and automatic opening vent, increase in size of the plant area, omission of a rooflight bay and internal alterations.

Variation of Conditions 1, 13 (part vi) & 19 (part h) of listed building consent dated 17 February 2020 (19/09926/LBC); for Alterations to existing building including creation of new pedestrian & vehicular entrances; alterations to bottle balustrades & parapets; creation of three additional storeys at fifth, sixth & seventh floors; creation of two additional basement storeys; partial demolition & reconstruction of central wing; demolition & reconstruction of Triangular Courtyard facades incorporating extensions at ground to fourth floors; external alterations to Quadrangle facades including new pedestrian entrances; landscaping to Quadrangle & Triangular Courtyards; creation of external terraces at fourth, fifth, sixth & seventh floors; entrance canopies; public realm works including alterations to security walls & bollards; removal & replacement of street trees; all in connection with use as hotel comprising up to 125 hotel bedrooms/suites with flexible hotel/retail/restaurant/bar use at part ground floor, flexible hotel/restaurant use at part lower ground, part ground & part second floors; flexible hotel/bar use at part fifth & part sixth floors; flexible retail, leisure, restaurant or bar use at part ground floor, leisure/spa facilities within the basement levels & part lower ground floor ancillary ballroom, event space & meeting rooms, food & beverage facilities, back of house facilities; car, cycle parking & servicing facilities; and up to 88 residential dwellings with ancillary communal amenities, car, cycle parking & servicing; namely, amendments to the Quadrangle courtyard paving, amendments to internal layout of two residential units; installation of additional windows to fifth floor; installation of external grilles to the east and north elevations and submission of details reserved by Condition 13 (vi) (internal finishes, including vehicle and service areas) and 19 (h) (stonework and ironwork gate details).

Variation of condition 1 and removal of conditions 9 and 10 of listed building consent dated 12 December 2018 (RN 18/08719/LBC ) for 'Alterations and extensions to 32 Belgrave Square and redevelopment of 25/27 Belgrave Mews South behind retained facade including new link extension between the mews house and main building, fourth floor infill extension, new mechanical plant and rooflights, and associated alterations, in connection with enlargement of single family dwellinghouse and erection of an Orangery extension beyond rear wing at ground floor level (site includes 32 Belgrave Square and 25/27 Belgrave Mews South)'. Namely, to vary the approved drawings to allow minor amendments to layout throughout the main house (inc. modern studwork to side of lift landing doors to be removed at all levels to facilitate the installation of the consented lift, adding electric blinds and / or secondary glazing to windows and lower ground floor, second, third and fourth floors, alterations to the ceiling in the first floor principal rooms, amendments to back staircase at first, lower ground and basement levels, reconfiguring of the layout of the spa area at lower ground level, adding a walk-in refrigerator within the household kitchen at lower ground floor level, minor amendments to orangery detailed design, alterations to the chimney pots on the Party Wall with 31 Belgrave Square, floor finishes changes at basement, lower ground, ground, first and second floor levels, fan coil unit locations updated, minor interior design amendments at lower ground, ground, first, second, third and fourth floors, and fireplace minor amendments (slips, grates etc.); alterations to fourth floor terrace including raising height of trellis; and internal alterations to the mews house.

Variation of Condition 1 of listed building consent dated 23 April 2020 (RN: 20/01070) for: Variation of Condition 1 of listed building consent dated 16 August 2017 (RN: 17/05798/LBC) for: Variation of Condition 1 of the listed building consent dated 09 February 2016 (RN 15/11153/LBC) for "Alterations including demolition and replacement of top floor extensions and extension of basement. Installation of plant internally and to the roof. Redevelopment of 4 Weymouth Mews including an additional mansard storey and roof top plant", NAMELY to allow replacement drawings making provision for: Internal alterations to the layout and interior design of the mews, alterations to the consented pavement grille outside the mews property, removal of the consented free-standing stone gazebo and installation of stone paving at the lower ground floor courtyard, replacement of secondary stair lantern with a different design, alterations to the fourth-floor terrace including removal of glass railing and replacement with black railings, removal of walk-on rooflight, relocation of the consented free-standing kitchen to the fourth floor terrace, omission of two south facing windows onto the sky lounge, installation of double glazing to the mews property, reconfiguration of the mews terrace and plant area to provide a better layout and ease of access for maintenance, various interior alterations to the main house including layout changes to the basement, 2nd, and 3rd and 4th floors, changes to new joinery, removal of the faux decorative panel installed for the Kings Speech film, changes to the secondary stair, removal of the basement courtyard portico, a switch to which fireplace is concealed in the 2nd floor master bedroom, M&E changes and changes to the 4th floor plant locations, and to make provision for lighting and small power.

Variation of condition 1 of listed building consent dated 29 April 2016 (RN: 15/10368/LBC) for 'Substantial demolition and redevelopment behind retained front facades as well as the demolition and reconstruction of mews properties to create two single family dwelling houses. Associated alterations and extensions include subterranean basements, which will extend beneath the mews, part courtyard and the rear sections of the listed buildings; re-instatement of the party wall in the rear courtyard; re-instatement of entrance to no.108; rear lower ground floor extensions partially infilling the rear courtyard and with roof terraces above; construction of full height closet wing extensions; reconstruction of mansard roof extension; installation of mechanical plant; and internal alterations on all floor levels (Site includes nos. 107 - 108 Eaton Square and nos. 107 - 108 Eccleston Mews)'. Namely, to allow minor amendments including a reduction in size of the basement extension (omission of the basement beneath the main house of both properties), alterations to the appearance of the building including retention of parts of the rear elevation and changes to the lower ground floor courtyard fenestration, and internal changes.

Excavation of a basement under footprint of the house and part of front and rear garden incorporating lightwells, demolition of existing rear conservatory and erection of a single storey glazed rear extension, removal of rear dormer and erection of new dormer window, installation of replacement rooflights, replacement/repair of windows, rebuilding of existing timber shed, installation of vehicular gates, installation of an air conditioning unit at the side of the building, and general internal/external refurbishment works. (Linked to 20/03115/FULL)