9 Cavendish Square London W1G 9DF
Refused on 26 February 2024
Council decision: Application RefusedDelegated (officer decision)
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 windows at 9 Cavendish Square with double glazed slim-line timber windows.
- Received
- 22 December 2023
- Decision level
- Delegated (officer decision)
- Council
- City of Westminster
- Ward
- Marylebone
- Agent
- Jones Lang LaSalle Limited
- ReceivedReceived22 Dec
- ValidatedValidated12 Jan
- Consult.Consultation
- TargetTarget Date8 Mar
- DecidedDecided26 Feb
Decided in 45 days (council typically 49)
About this application
This is a full planning application for window replacement at 9 Cavendish Square London W1G 9DF. Westminster has handled 4,484 applications of this type. This one was decided in 66 days, 2 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 13 listed buildings nearby. There have been 2 other applications at this address. In the past year there have been 171 applications across Marylebone. We hold 590 applications in total for the W1G postcode area.
86% of full 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
- W1G 9DF
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 12 January 2024
- Consultation expiry
- 21 February 2024
- Target decision date
- 8 March 2024
Applicant and agent
- Agent
- Jones Lang LaSalle Limited
- Agent address
- 30 Warwick Street London W1B 5NH
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 31 January 2024
- Advertisement expiry
- 21 February 2024
- Site notice start
- 18 January 2024
- Site notice end
- 8 February 2024
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 - 202622 Jun
Installation of CCTV cameras at ground floor level on the Chandos Street and Cavendish Square elevation and…
RefusedApplication26/03309/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
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
- 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
- The Langham 1C Portland Place London W1B 1JA25/06240/FULL · FullApproved0.1 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
Planning something similar?
See what the council approved and refused for window and door replacements on your street. Pick your home and get the evidence before you pay for drawings.