Underpinning the party and boundary wall between Pegasus House and 36 Sackville Street.

Redevelopment of Pegasus House and Nuffield House including demolition behind a retained facade (west, south and east) of Nuffield House and replacement building comprising 2 level basement, ground, mezzanine and first to seventh floor and demolition and replacement of Pegasus House comprising 2 level basement, ground, mezzanine and first to fifth floors and other associated works already approved under application RN 20/07676/LBC additional works include Namely, at roof level to retain the existing boundary wall between the site and the neighbouring property at 36 Sackville Street, to adapt the head of the secondary staircase and the relocation of the generator flu to the centre of the staircase, and to install a lead and stone cap infill where a modest gap will be created between the site and 36 Sackville Street.

Excavation of double storey basement extending under house, front and rear gardens and underneath the pavement to Craven Hill, associated replacement of rear garden staircase and garden room and boundary railings, and alterations to front lightwell. Replacement of storage shed with louvred structure for air conditioning equipment, new subterranean link structure to facilitate amalgamation of nos. 23 and 23a Craven Hill

Excavation of basement storey beneath main house, demolition and rebuilding of mews house at new height plus the addition of a lower ground floor storey, demolition and rebuilding of main roof plus addition of plant equipment, erection of extension for lift from basement to third floor level, demolition and replacement of interconnecting extension between main and mews house, use of roof of interconnecting extension as a roof terrace, increasing height of boundary shared with 78 Chester Square and other external alterations as well as internal alterations throughout. (Linked with 22/05927/FULL)

Internal and external works to the House of St Barnabas Chapel, comprising; installation of lights to the interior window reveals of the stained glass windows; replacement of the internal door lock; replacement of the iron railings and lowering of the boundary wall; replacement of the external steel mesh on the stained glass windows; installation of external lights to the facaade of the Chapel and in the grounds of the Chapel; replacement of the existing paving with York stone paving; installation of CCTV; installation of tree grill; and associated external alterations.

Removal of section of the front boundary railing, installation of a new external stair from street level to floor of front lightwell, including new gate at head of stair to match existing railings. Formation of door opening in screen wall to west side of house in line with front elevation to afford access to the rear garden of the property. (Linked to 22/01421/FULL)

Demolition and replacement of existing rear infill extension with a new two storey glazed infill extension to the main house; replacement roof to closet wing extension; trellis to boundary wall to provide screening, replacement openings and new access to rear elevation. Replacement roof top plant equipment. Internal alterations and reconfiguration of the property at all levels. Alterations to Hanover Mews (Linked with 21/07738/FULL)