Variation of Condition 1 and 11 of planning permission dated 20 October 2022 (RN: 22/04903/FULL) for the demolition of existing mansard roof and roof level plant and construction of two storey vertical roof addition with extensions at fourth, fifth, sixth and seventh floor levels for additional office (Class B1) floorspace. Use of the lower ground and basement level for flexible/alternative office (Class B1)/retail (Class A1)/leisure uses (Class D2); car parking, cycle parking, ancillary office uses and mechanical plant. Alterations to the existing building including new windows and entrance, new terraces to eighth and tenth floor levels and new plant enclosure at roof level and associated works; and amendments to car parking provision (retention of the public car park), alterations to the cycle parking provision and basement layouts and reduction in flexible commercial floorspace; namely, design modifications to the Carlton House Terrace elevation including an additional entrance, pavement lights, replacement railings and re-alignment of a section of the south facade; alterations to the lower ground floor glazing on the west elevation, a new stairwell and platform lift to roof terrace (level 10), widening of central core to accommodate emergency access and fire-fighting lifts, realignment of level 10 balustrade and alterations to south-west lift overrun and amendment to the wording of Condition 11 to include the word 'pergolas'.

Variation of Conditions 1 and 13 of planning permission dated 06 January 2022 (20/05147/FULL) for part demolition of rooftop plant room and creation of a single storey roof extension at Brettenham House to provide B1 office floorspace; associated creation of terraces to the north and south part of the roofs; replacement and relocation of roof plant to basement level at Brettenham House; creation of a new office entrance to Savoy Street at basement level one of Brettenham House; refurbishment of ground floor shopfronts at Brettenham House on Lancaster Place facade; provision of cycle parking and associated facilities in the basement of Brettenham House; replacement of all the external windows and associated facade maintenance and cleaning and associated works at Brettenham House and 1 Lancaster Place NAMELY; alterations to the design of Savoy Street elevation, new accessible entrance to Savoy Street elevation, alterations to the cycle service and basement layout and UKPN substation access.

Variation of condition 1 of planning permission dated 01 March 2012 (RN:11/11498/FULL) for use of part ground and upper floors as a single dwelling house (Class C3). Demolition of part of the existing two storey rear extension at ground and first floor level to create an open patio area. Construction of rear extension at second floor level. Removal of part of the existing roof and attic space to create a roof terrace and rooflight and screen to front elevation. Alterations to front and rear elevation windows and doors. NAMELY, repositioning of metal balustrade and extension of flank parapet wall.

Variation of condition 1 of planning permission dated 4th October 2022 (RN 22/00448/FULL) for the demolition of the existing hipped roof and construction of a roof extension, a rear extension involving the infill of an existing undercroft area at ground floor, the replacement of an existing link building (between the building fronting Chapel Side and Esca House to the rear) and an additional second floor storey, and the excavation of a basement under the main building, in association with the change of use of the ground and first to residential flats (Class C3). Replacement windows to the front and rear elevations, and the creation of a terrace and green roof on the rear extension roof at third floor level and a terrace at rear fourth floor level. NAMELY, to increase size of basement level and creation of associated lightwell; Alterations to fenestration; relocation and alteration of rear dormers; Internal changes to layout of residential accommodation; and associated external alterations.

Variation of condition 1 of planning permission dated 08 March 2021 (RN: 20/03732/FULL) for the: Single storey rear extension with external landscaping following demolition of existing side and rear additions; Rear extension to existing flat-roofed North East Bay; New metal fence and Entrance gate; Rear skylight to replace existing, plant, all in connection with use as single dwellinghouse. NAMELY, alteration to, and introduction of windows and doors; replacement of existing timber side entrance to be rendered to match the main house; metal railings to the front elevation; traditional cast iron railings to rear elevation; soil vent pipes to rear and side elevations; ridge tiles to the south east bay; and retention of the flank wall in yellow stock brick instead of the approved rendering.

Variation of condition 1 and13 of planning permission dated 06 January 2022 (20/05147/FULL) for 'Part demolition of rooftop plant room and creation of a single storey roof extension at Brettenham House to provide B1 office floorspace; associated creation of terraces to the north and south part of the roofs; replacement and relocation of roof plant to basement level at Brettenham House; creation of a new office entrance to Savoy Street at basement level one of Brettenham House; refurbishment of ground floor shopfronts at Brettenham House on Lancaster Place facade; provision of cycle parking and associated facilities in the basement of Brettenham House; replacement of all the external windows and associated facade maintenance and cleaning and associated works at Brettenham House and 1 Lancaster Place'. Namely, to allow the following amendments: (1) the two double doors adjacent to the bays on Savoy Street to be relocated to allow for UKPN substation access and fire egress; (2) the louvre on Savoy Street will be replaced by a single fire escape door; (3) the double height roller shutter with wicket door will be replaced by a smaller double door and window on Savoy Street; (4) internal layout amendments at Basement 2 level including relocation of the disabled parking bays to Savoy Street, if the demand arises; and (5) relocation of the accessible entrance to the building.

Variation of condition 1 of planning permission dated 01 February 2017 (RN: 16/07799/FULL) for 'Alterations including erection of extensions at rear lower ground, ground and first floor levels, creation of roof terrace at rear third floor level, replacement of non-original windows, external repair works and landscaping'. Namely, to allow amendments including repairs to the front and rear elevations and roof coverings; adjustments to the access hatch to the roof, omission of the approved walkway and handrail and re-siting of the chimneystack to its original position; repair and rationalisation of pipework; alteration of rear French door design and provision of double glazing in the conservatory; enclosing of the rear lightwell between the main house and extension at lower ground level with rooflights; alteration of landscaping in the garden and terrace areas; and internal refurbishment works.

Variation of condition 1 of planning permission dated 25th August 2021 (RN 21/03822/FULL) which itself varied condition 1, condition 4 (part a) and condition 5 (parts i, iv and v) and the removal of Condition 4 (parts b and c), 5 (parts ii and iii) and 8 of planning permission dated 3 December 2020 (RN:20/03764/FULL) for '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 repairs; and other associated works in connection with the existing use (Sui Generis)'. Namely, amendments to the abutment of the roof extension with Banqueting House and alterations to the rear part of the mansard roof extension.

Variation of Condition 1 of planning permission dated 22nd June 2021 (RN: 21/00511/FULL) for, 'Erection of rear extensions at second, third and fourth floor levels to incorporate a new lift; demolition of existing mansard roof and erection of replacement mansard; demolition and replacement of rear courtyard floor slab; installation of air conditioning units at roof level and under pavement basement vaults; demolition and rebuild of two chimney stacks on the mews; replacement of windows on all elevations of the main house, demolition and re-building of rear ground floor toilet annexe, and associated internal and external works'; NAMELY to install new lanterns on the railings at the front entrance of the building, and security cameras at ground and lower ground floor level.

Variation of condition 1 of planning permission dated 19th July 2021 (RN 21/02117/FULL) for the erection of roof extension at fourth floor level to enlarge dwellinghouse (Class C3), renewal of the roof terrace trellis and planters, reduction of garage door width and addition of new section of wall with a casement window to rear elevation. NAMELY, alterations to Lower Ground floor, the proposed metal Garage shutter is replaced with a timber horizontal sliding door to match existing at 25; At Lower Ground floor, the new addition of wall with a casement window to rear elevation will be cladded with timber to match the Garage door finish; All the existing windows throughout the house will be replaced with new timber windows to match existing and providing better thermal insulation and a new walk-on rooflight with etched glass is added to the Front Terrace to provide natural light to Bathroom 1 (S73 application).