17 Belgrave Square London SW1X 8PG
Refused on 7 May 2026
Proposal
Amendments to planning permission dated 13th December 2019 (RN: 18/01324/FULL) for Demolition of annexe building and replacement with rear extensions to 17 Belgrave Square and excavations to create pool hall extension under garden of 17 Belgrave Square and basement beneath mews property; all in connection with the use of the mews property and 17 Belgrave Square as two single family dwelling houses. Namely to allow proposed reconfiguration and enhancement of the area between the Main House and the Mews, including the erection of a pergola structure, minor alterations to the rear annex openings, and updated rear garden layout.
- Received
- 10 April 2026
- Council
- City of Westminster
- Ward
- Knightsbridge & Belgravia
- Agent
- Montagu Evans LLP
- ReceivedReceived10 Apr
- ValidatedValidated10 Apr
- Consult.Consultation
- TargetTarget Date8 May
- DecidedDecided7 May
Decided in 27 days (council typically 49)
About this application
This is an application to amend a permission at 17 Belgrave Square London SW1X 8PG. Westminster has handled 604 applications of this type. This one was decided in 27 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 14 other applications at this address. In the past year there have been 380 applications across Knightsbridge & Belgravia. We hold 1,289 applications in total for the SW1X 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
- SW1X 8PG
- Application type
- Non-material amendments
- Scale / size
- Small
Planning application dates
- Date validated
- 10 April 2026
- Target decision date
- 8 May 2026
Applicant and agent
- Agent
- Montagu Evans LLP
- Agent address
- 70 St Mary Axe London EC3A 8BE United Kingdom
Planning decision
- Statutory period
- 28 days
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Belgravia
- 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
- 202610 Apr
Amendments to planning permission dated 13th December 2019 (RN: 18/01324/FULL
This applicationRefusedNon-material amendment26/02370/NMA - 202610 Apr
Internal alterations.
ApprovedListed building consentFiled alongside26/02371/LBC
Planning history at this site
20 other applications at this property, newest first.
- 20266 Aug
Details of windows, doors, garage doors, roof lantern and new lighting and flooring in the principal rooms…
ApprovedListed building consent26/05327/ADLBC - 202620 Jul
Detailed drawings of garage doors, roof lantern and any new lighting and flooring in the principal rooms…
ApprovedDischarge of conditions26/04850/ADLBC - 202616 Jul
Detailed drawings of windows, doors, garage doors, which should appear as side hung, not up and over and roof…
PendingDischarge of conditions26/04761/ADFULL - 202614 Jul
Details of secure cycle storage and details of how waste and recycling is going to be stored on the site…
ApprovedDischarge of conditions26/04710/ADFULL - 202629 May
Detailed drawing of floor build-up of the underfloor heating system; pursuant to condition 12 of Listed…
ApprovedListed building consent26/03541/ADLBC - 202615 May
Details of the elevations and sections of the new windows showing integral glazing bars and elevations and…
ApprovedListed building consent26/03061/ADLBC - 20268 May
Removal of Condition 10 of listed building dated 18th August 2025 (RN:25/03417/LBC
PendingVariation of conditions (s73)26/03051/FULL - 20268 May
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition…
ApprovedDischarge of conditions26/03058/ADLBC - 20268 May
Reconfiguration and alteration of the area between the main building and the Mews, including the erection of…
ApprovedFull Planning Permission Application26/03054/FULL - 20268 May
Details of the elevations and sections of the new windows (scaled 1:10) showing integral glazing bars and of…
ApprovedDischarge of conditions26/03053/ADFULL - 20268 May
detailed drawings at a scale of 1:10 and sections at 1:5 of Windows, Doors, Garage Doors, which should appear…
ApprovedDischarge of conditions26/03059/ADLBC - 20268 May
Removal of Condition 10 of listed building consent dated 18th August 2025 (RN:25/03417/LBC
ApprovedListed building consent26/03051/LBC - 20268 May
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition 6…
ApprovedDischarge of conditions26/03052/ADFULL - 202526 Sep
Replacement of existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at…
ApprovedListed building consent25/06936/LBC - 202526 Sep
Replacement of existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at…
ApprovedFull Planning Permission Application25/06935/FULL - 20253 Jul
Replacement of existing lift shaft, repositioning of two windows and one door and upgrading of external…
ApprovedListed building consent25/04567/LBC - 20253 Jul
Replacement of existing lift shaft, repositioning of two windows and one door and upgrading of external…
ApprovedListed building consent25/04566/FULL - 202519 May
Replacement and erection of five air condenser units within acoustic enclosure on main roof of 7 Belgrave…
ApprovedListed building consent25/03416/FULL - 202519 May
Replacement and erection of five air condenser units within acoustic enclosure on main roof of 7 Belgrave…
ApprovedListed building consent25/03417/LBC - 202531 Mar
Amendments to planning permission dated 13 December 2019 (RN: 18/01324/FULL
ApprovedNon-material amendment25/02147/NMA
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
- 17 Belgrave Square London SW1X 8PG26/04850/ADLBC · ConditionsApproved0.0 mi
- 17 Belgrave Square London SW1X 8PG25/06936/LBC · HeritageApproved0.0 mi
- 17 Belgrave Square London SW1X 8PG26/04710/ADFULL · ConditionsApproved0.0 mi
- 17 Belgrave Square London SW1X 8PG26/03054/FULL · FullApproved0.0 mi
- 17 Belgrave Square London SW1X 8PG26/02371/LBC · HeritageApproved0.0 mi
For applicants and trades
Consultants on this application
- Montagu Evans LLP · Agent for this application
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing1.0 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman1.9 mi
- Hillgrove Projects LtdVerifiedLondon3.9 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering4.3 mi
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