79 Chester Square London SW1W 9DU
Approved on 24 July 2026
Proposal
Amendments to planning permission dated 5th January 2023 (RN:22/05927/FULL) for 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. Namely,to the optimisation of the photovoltaic array approved under condition 10 and the clarification of installation requirements under condition 14.
- Received
- 25 June 2026
- Council
- City of Westminster
- Ward
- Knightsbridge & Belgravia
- ReceivedReceived25 Jun
- ValidatedValidated25 Jun
- Consult.Consultation
- TargetTarget Date23 Jul
- DecidedDecided24 Jul
Decided in 29 days (council typically 49)
About this application
This is an application to amend a permission at 79 Chester Square London SW1W 9DU. Westminster has handled 604 applications of this type. This one was decided in 29 days, 3 weeks quicker than Westminster's typical decision time. The site is in the Belgravia conservation area, with 11 listed buildings nearby. There have been 10 other applications at this address. In the past year there have been 380 applications across Knightsbridge & Belgravia. We hold 1,478 applications in total for the SW1W postcode area.
88% of amendment applications at City of Westminster were approved. Across all application types, the council typically decides in about 7 weeks (median).
Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street
Application details
- Postcode
- SW1W 9DU
- Application type
- Non-material amendments
- Scale / size
- Small
Planning application dates
- Date validated
- 25 June 2026
- Target decision date
- 23 July 2026
Planning decision
- Statutory period
- 28 days
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Belgravia
- Listed building: Grade II: Nos 77 to 80 (consec), 80a and Mews Arch, Chester SquareOn or next to this site
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)
flood storage areas, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.
A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.
Data © Crown copyright and others · sources and licences
Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.
© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.
© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.
Contains Ordnance Survey data © Crown copyright and database right 2026.
Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.
Associated applications
- 202625 Jun
Amendments to planning permission dated 5th January 2023 (RN:22/05927/FULL
This applicationApprovedNon-material amendment26/04196/NMA - 202625 Jun
Detailed drawings and the manufacturers specification; of the photovoltaic panels that will be used on main…
ApprovedDischarge of conditionsFiled alongside26/04197/ADFULL - 202625 Jun
Removal of photovoltaic panels from the south-west facing mansard slope and installation of photovoltaic…
ApprovedListed building consentRelated26/04198/LBC
Planning history at this site
12 other applications at this property, newest first.
- 202620 Aug
Details of a further noise report pursuant to condition 12 of planning permission dated 5th January 2023…
ApprovedDischarge of conditions26/05726/ADFULL - 20267 May
Details of new interior, which must be appropriate to the period of the building and their location; pursuant…
ApprovedListed building consent26/02994/ADLBC - 20267 May
Details of new interior, which must be appropriate to the period of the building and their location; pursuant…
ApprovedDischarge of conditions26/02993/ADFULL - 20266 May
Details of biodiversity management plan in relation to second floor green roof pursuant to condition 9…
ApprovedDischarge of conditions26/02991/ADFULL - 202528 Feb
Addition of a glazed roof/ infill extension within the rear light well at ground floor level, relocation of…
ApprovedListed building consent25/01311/LBC - 202528 Feb
Addition of a glazed roof above the new rear light well, relocation of the living wall and removal of the…
ApprovedFull Planning Permission Application25/01359/FULL - 202529 Jan
Details of the new basement staircase pursuant to condition 5 (iv) of planning permission dated 05 January…
ApprovedDischarge of conditions25/00587/ADFULL - 202528 Jan
Details of contamination validation report pursuant to Condition 11 (Phase 4) of planning permission dated 05…
ApprovedDischarge of conditions25/00552/ADFULL - 20253 Jan
Layout alterations to the newly-built basement layout, pool size and reorientation of the new staircase.
ApprovedListed building consent24/08785/LBC - 202419 Jan
Details of sample panel of brickwork pursuant to Condition 4 of Listed Building Consent dated 11 January 2023…
ApprovedListed building consent24/00380/ADLBC - 202417 Jan
Details of sample panel of brickwork pursuant to Condition 6 of planning permission dated 05 January 2023…
ApprovedDischarge of conditions24/00313/ADFULL - 20232 Mar
Details of signed Appendix A Code of Construction Practice checklist pursuant to Condition 4 of planning…
ApprovedDischarge of conditions23/01371/ADFULL
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Around this site
Nearby applications
- 79 Chester Square London SW1W 9DU26/02993/ADFULL · ConditionsApproved0.0 mi
- 79 Chester Square London SW1W 9DU26/02991/ADFULL · ConditionsApproved0.0 mi
- 79 Chester Square London SW1W 9DU26/02994/ADLBC · ConditionsApproved0.0 mi
- 79 Chester Square London SW1W 9DU25/01359/FULL · FullApproved0.0 mi
- 78 Chester Square London SW1W 9DU24/00172/FULL · FullApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing0.9 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman1.9 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering4.1 mi
- Orient Construction Consultancy LimitedVerifiedLondon4.8 mi
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