Erection of rear extensions at lower ground and ground floor levels. Reconstruction and extension of rear closet wing with pitched roof; Replacement of roof with a mansard roof with dormer windows. Replacement of existing sash windows with double glazed timber windows: Installation of plant within acoustic enclosure to rear; and landscaping works.

Internal and external alterations including excavations of extended basement floor, erection of replacement rear extensions, formation of roof terraces, replacement of mansard roof extension and installation of mechanical plant at roof level to No.73, alteration and replacement of external railings and new windows and doors, new floor finishes, and internal alterations to all floors. (Linked to 23/00770/FULL)

Amendments to planning permission dated 7th December 2021 (RN:21/01871/FULL) for Erection of a single storey rear extension and a glass enclosure spanning the alleyway on boundary with Elgin Mews North. Namely, the glass roof is to be amended to have a minor slope towards the east rather than the west, reducing height of the boundary wall and relocation RWP.

Amendments to planning permission dated 11th October 2023 (RN:23/02276/FULL) for Alterations including erection of roof extension to create an additional storey of accommodation. Namely, to adjust the dimensions of the two side windows on the south building elevation from 2700mm x 600mm (first floor) and 2100mm x 600mm (second floor/roof level) to 2700mm x 615mm (first floor) and 2100mm x 638mm (second floor/roof level)

Erection of a rear extension at lower ground floor; replacement of side lower ground floor; excavation of a new basement; installation of replacement dormers; new rooflights to main roof and at lower ground floor roof level; new plant enclosure to the rear garden and new lightwells and skylights

Variation of condition 1 of the planning permission dated 20 June 2013 (RN:12/09687/FULL) for the Use as nine residential flats (Class C3) and external alterations, including excavation of extended basement floor, erection of replacement rear extensions, formation of roof terraces, replacement of mansard roof extension and installation of mechanical plant at roof level to No.73, alteration and replacement of external railings and new windows and doors ; Namely , amendments to the layout and areas of residential demises and internal circulation strategy; Installation of sprinkler; Alterations to rooftop and basement plant layout and installation of plant to second floor terrace; Alterations to waste storage arrangements; and expansion of green roof at third floor level. (Linked to 23/00772/LBC)

Erection of mansard roof extension to provide additional accommodation for the top floor flat (Flat C).

Variation of condition 1 of planning permission dated 6th June 2023 (RN 23/00698/FULL) for the erection of single storey roof extension to rear courtyard building, replacement windows, installation of railings around a new front lightwell and associated works, all for use of enlarged building as 6 self-contained residential dwellings comprising 5 x1 bedroom and 1 x 3 bedroom units (Class C3). NAMELY, for a new lift to serve the residential flats; and new connecting ramp, which would link the front and rear buildings to provide level access.

Erection of a single storey extension to replace existing mansard roof level; a new mansard roof extension incorporating dormers; two conservation roof lights and alterations to parapet walls, side chimney stacks and 2nd floor front and rear elevations and extension of rear extractor duct. All in association with extending existing second floor flat.

Variation of condition 1 of planning permission dated 04 March 2021 (RN: 20/05720/FULL) which itself varied condition 1 of planning permission dated 28th February 2020 (RN: 19/06301/FULL) for, 'Use of 22 Grosvenor Square, 43 North Audley Street and 1 Lees Place as a hotel, restaurant and private members club/bar (Sui Generis), with works including the infilling of the alleyway to the rear of 43 North Audley Street, partial demolition and rebuilding of 43 North Audley Street to provide a building of two storeys plus mansard, erection of a two storey extension to the rear facade of 1 Lees Place, including the extension of the basement floor to the front facade; installation of plant, the creation of a terrace at roof level of 22 Grosvenor Square and associated internal and external alterations'; NAMELY, changes to roof top plant, low-level plant enclosure at northern extent of level 5, inclusion of an emergency plant noise condition, and addition of attenuated louvre with decorative screening to the refuse store doors to ground floor in Lees Place. (S73 application)