Amendments to 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 balustrade and flank wall extended.

Amendments to planning permission dated 23rd January 2023 (RN: 22/05428/FULL) for two-storey extension including roof-level plant along the Bressenden Place façade to provide a new office entrance pavilion (Class E), the provision of Class E office / retail accommodation, remodelling of the crown of Portland House and creation of a setback rooftop extension to provide office amenity (Class E) and an outdoor terrace, reconfiguration of the second floor plant accommodation fronting Cardinal Place, relocation of the zephyr on Bressenden Place, provision of cycle parking, public realm and associated works including window replacement and the application of a new façade treatment, namely to amend the wording of Condition 3 (Code of Construction Practice) to enable early works to be carried out in accordance with the Appendix A dated 22/11/22 signed by the Environment Inspectorate and prior to the discharge of Condition 3.

Amendments to planning permission dated 02nd June 2021 (RN: 21/03676/FULL) for introduction of new timber bi-fold casement windows at ground floor; introduction of new timber double doors to the second floor Foubert's Place elevation to provide access to the roof terrace; provision of a kitchen extract duct to the side elevation of Lasenby House (32 Kingly Street) to roof level; construction of a plant enclosure to the roof; and extending internal stair from first to second floors within the lightwell at rear of the building. NAMELY, revised route of extract duct through the rear wall at 1st floor level and around the lift shaft; revision to door location in slate clad plant enclosure; omission of vertical extension in lightwell at 2nd floor level.

Amendments to planning permission dated 15th December 2021 (RN:20/03623/FULL) for amalgamation of two maisonettes to create a single dwelling house [Class C3], excavation beneath the footprint of the existing building and excavation of part of rear garden at lower ground floor level. Demolition of the existing extension to the rear and construction of a new lower ground and ground floor rear extension. Repair work to the facade, alteration to street frontage in line with the street and landscaping to the rear garden. Installation of acoustically attenuated condenser to the rear garden. Namely, to amend the wording of Condition 16 (Contaminated Land) to allow radon monitoring to occur 'after' occupation.

Amendments to planning permission dated 30 March 2022 (21/07642/FULL) for the variation of Conditions 1, 20, 21, 23, 24 of planning permission dated 16th March 2021 (RN 20/04933/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; 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, Street scape enhancements (Front elevation - Carlton House Terrace and Facade realignment); Amenity enhancements (Inclusion of glazed doors to external terraces (west elevation), external terraces and Level 10 Roof Access) and Detailed design and technical amendments (Widening of the central 'core strip' and Balustrade Position at level 10).

Amendments to planning permission dated 14 March 2019 (RN: 18/10375/FULL) for 'Alterations at 13-15 Princes Gate including use as a single family dwelling: excavation of basement level; erection of full height side infill extension at first to third floor levels; alterations within area between Kingston House South and 13 Princes Gate including erection of single storey extension at lower ground floor level and installation of new railings, car lift and storage cupboards; demolition and reconstruction of rear ground floor terrace incorporating new spiral stair to lower ground floor level; demolition and alterations at roof level including creation of inset roof terrace and installation of air conditioning and use of 15 Princes Gate to single family dwelling: excavation of basement level; demolition of rear ground floor extension and demolition and reconstruction of rear ground floor terrace; demolition and alterations at roof level including removal of roof extension and creation of inset terrace and installation of air conditioning, alteration and reduction of side infill extension, minor additional basement excavation, minor alterations within rear side garden, to the car lift, to roof lights, front door, at roof level and internally'. Namely, to amend condition 14 to allow extension of construction hours at the site until 21:00 hours Monday to Saturday.