9 Cavendish Square London W1G 9DF
Refused on 13 August 2026
Council decision: Application Refused1 reason for refusal
Proposal
Installation of CCTV cameras at ground floor level on the Chandos Street and Cavendish Square elevation and installation of louvres (to provide air flow without mechanical assistance) in place of existing windows at lower ground floor.
- Received
- 19 May 2026
- Council
- City of Westminster
- ReceivedReceived19 May
- ValidatedValidated22 Jun
- Consult.Consultation
- TargetTarget Date
- DecidedDecided13 Aug
Decided in 52 days
About this application
This is a planning application for window replacement at 9 Cavendish Square London W1G 9DF. Westminster has handled 27,108 applications of this type. This one was decided in 52 days, 3 days longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 14 listed buildings nearby. There have been 2 other applications at this address. We hold 590 applications in total for the W1G postcode area.
Why it was refused
- Because of the size and siting of the CCTV cameras, and the design and location of the louvres, the proposals would harm the appearance of this building and fail to maintain or improve (preserve or enhance) the character and appearance of the Harley Street Conservation Area. This would not meet Policies 42, 44 and 45 of the City Plan 2019 - 2040 (January 2026).
From the council's decision notice.
Application details
- Postcode
- W1G 9DF
Planning application dates
- Date validated
- 22 June 2026
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Harley Street
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed
- Tree Preservation Order: Ref W213Protected tree on or next to this site
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (20)
flood storage areas, 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.
- 202618 Sep
Installation of louvre grille in place of existing above-door glass panels on the lower ground floor.
ApprovedApplication26/06413/FULL - 202529 Jul
Installation of a non-mechanical louvre at lower ground floor level on the Chandos Street elevation.
ApprovedFull planning permission25/05090/FULL - 20259 Jun
Amendments to planning permission dated 08 November 2022 (RN:22/06159/FULL
WithdrawnNon-material amendment25/03884/NMA - 202322 Dec
Replacement of existing windows at 9 Cavendish Square with double glazed slim-line timber windows.
RefusedFull Planning Permission Application23/08915/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
- 9 Cavendish Square London W1G 9DF23/08915/FULL · FullRefused0.0 mi
- Basement Part 10A Chandos Street London W1G 9DQ26/01962/AD7 · AdvertisingApproved0.0 mi
- 14 Cavendish Square London W1G 9DB25/00722/FULL · FullApproved0.0 mi
- 12 Harley Street London W1G 9PB24/07384/FULL · FullAwaiting decision0.0 mi
- 12 Harley Street London W1G 9PB24/07385/LBC · HeritageAwaiting decision0.0 mi
For applicants and trades
Contractors near this project
Find contractors for windows & doors near this site- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman0.5 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing0.6 mi
- Orient Construction Consultancy LimitedVerifiedLondon3.8 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.5 mi
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