12 Chester Street London SW1X 7BB
Approved on 23 June 2026
Boundary © HM Land Registry, © Ordnance Survey · details
This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.
Proposal
Replacement of existing rear extension at first, second and third with a new rear extension (first to third floor level) with flat roof. Erection of an extension at rear ground floor level. Removal of the existing kitchen rooflight and extension of existing terrace at first floor level. Replacement of existing windows and French doors with new; and alterations to French door width at rear first floor level.
- Received
- 1 May 2026
- Council
- City of Westminster
- Ward
- Knightsbridge & Belgravia
- ReceivedReceived1 May
- ValidatedValidated1 May
- Consult.Consultation
- TargetTarget Date26 Jun
- DecidedDecided23 Jun
Decided in 53 days (council typically 49)
About this application
This is a heritage application for a rear extension at 12 Chester Street London SW1X 7BB. Westminster has handled 2,677 applications of this type. This one was decided in 53 days, 4 days longer than Westminster's typical decision time. The site is in the Belgravia conservation area, with 17 listed buildings nearby. There have been 4 other applications at this address. In the past year there have been 383 applications across Knightsbridge & Belgravia. We hold 1,284 applications in total for the SW1X postcode area.
93% of heritage 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.See what's approved near your address
Application details
- Postcode
- SW1X 7BB
- Application type
- Listed Building Consent Application
- Scale / size
- Small
Planning application dates
- Date validated
- 1 May 2026
- Target decision date
- 26 June 2026
Applicant and agent
- Agent address
- Studio 33-34 10 Hornsey Street London N7 8EL GB
Planning decision
- Statutory period
- 56 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.
Planning history at this site
4 other applications at this property, newest first.
- 20269 Mar
Variation of Condition 1 and removal of Conditions 3, 4 and 9 of planning permission dated 24 July 2025 (RN…
ApprovedVariation of conditions (s73)26/01507/FULL - 202629 Jan
Amendment to planning permission dated 24th July 2025 (RN 24/05883/FULL
ApprovedNon-material amendment26/00535/NMA - 202522 Dec
Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the…
ApprovedListed building consent25/09272/LBC - 202522 Dec
Installation of air conditioning units within an acoustic enclosure at roof level and replacement of the…
ApprovedApplication25/09271/FULL
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 Chester Street London SW1X 7BB24/06988/ADFULL · ConditionsApproved0.0 mi
- 8 Chester Street London SW1X 7BB14/05151/ADFULL · ConditionsApproved0.0 mi
- 8 Chester Street London SW1X 7BB14/01488/LBC · HeritageApproved0.0 mi
- 8 Chester Street London SW1X 7BB14/05139/ADLBC · ConditionsApproved0.0 mi
- 8 Chester Street London SW1X 7BB14/01487/FULL · FullApproved0.0 mi
For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing0.8 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman1.7 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering4.3 mi
- Orient Construction Consultancy LimitedVerifiedLondon4.7 mi
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