Works to front lower ground floor including new York stone paving to lightwell with single step below external staircase, new timber sash window with sidelights, new security railings to both windows in lightwell at no. 25, to match no. 26 existing railings; new York stone paving at no. 26, lightwell, and new Portland stone to both no. 25 and no. 26; rear elevation works include new glazing and glazing bar layout to external door to rear elevation, omit proposed screen between no. 25 and no. 26 terraces, new metal railings to coping at no. 25 terrace and new double dormer; new front door, garage gate and associated fanlights at no. 48; internal alterations; and associated works (site includes 25-26 Chester Square and 49-48 Eaton Mews South). (Amendments to previously granted Listed Building Consent dated 22 December 2022 RN: 22/06622/LBC).

Internal at all levels to reconfigure layouts and external alterations to the eastern lightwell and rear elevation and courtyard, creation of a concealed plant area at roof level within an acoustic enclosure and new dormer windows.

Erection of dormer windows to side and rear roof slopes of 23 and 25 Abbey Road and internal alterations at 2nd floor levels to create access to new loft spaces. (Linked with 23/04011/FULL)

Creation of two inverted dormer openings within the existing first floor mansard roof to the rear of the building, to house louvred vents.

External and internal alterations including new marble entrance step,new steel staircase to front lightwell. Alteration to slope of roof at rear ground floor and replacement in slate, new dormer windows to roof, lead renewal to roof. New internal staircase to 3rd and 4th floors, minor alteration to flat layouts, removal of non-original partitions, new bathrooms and kitchens, dropped ceilings to lower ground floor and within part of residential units, insulation and sound proofing to floor voids, replacement of damp proofing to lower ground floor, replacement of and repairs to doors to meet fire standards. Secondary glazing to existing windows, replacement of non-original sash windows with new to match original. New plant to rear ground floor roof and ground floor lightwell including new enclosure, fan coil units internally and replacement rooflights.

Installation of replacement dormer windows at fourth floor level to north and west facades of Westminster Cathedral Choir School; facade repairs including re-pointing and replacement of failed tiled sills and tile creasing; roof repairs; refurbish and redecorate existing timber windows including installation of double glazing.

Demolition of the existing double pitch roofs and replacement with a roof terrace with a new natural slate mansard roof surround with dormer windows, associated new access stair, WC & minor store. New structural support at upper floor levels to support the side wall; a new staircase connection to lower levels and some minor internal works including installation of a misting system and reinstatment of some removed or altered original features.

Retention of dormer and minor works to roof structure.

Replacement of five existing timber dormer windows to front and rear elevations with slimline double glazed timber windows; replacement of existing slate roof coverings to main roof with new natural slate; installation of insulated 'warm roof' system over existing dormer and closet wing flat roof coverings; and render repairs to parapets and party walls. (Linked with 23/01730/FULL)

Erection of rear extension at lower ground floor level, extension under front garden and associated lowering of lower ground floor level; Erection of rear dormer; Alterations to fenestration; Installation of plant machinery; Erection of outbuilding in rear garden; Alterations to rear boundary walls; landscaping works; and associated external alterations. Internal alterations, including changes to planform. (Linked with 22/07801/FULL)