14 Cavendish Square London W1G 9DB
Proposal
Alterations including; demolition and alteration to roof structure including the installation of mechanical plant to roof valley above and the provision of a new terrace and associates railing and access arrangement (sliding roof light) to the rear of the main roof, removal of fixed rooflight over central stair; removal of stair from third floor terrace to plant zone at main roof level; installation of replacement roof lights at main roof level; refurbishment of main entrance door, installation of replacement security camera system, alteration to the ground and lower ground floor fenestration facing Deans Mews and facing internal lightwell, installation of replacement windows and doors at rear ground fand first floor level facing Deans Mews elevation and within the internal lightwell, removal of render to lightwell, installation of replacement cover and railings to first floor terrace, installation of onsite greening. Internal alteration and refurbishment throughout.
- Received
- 30 October 2025
- Decided
- 11 March 2026 · Application Permitted
- Council
- City of Westminster
- ReceivedSubmitted30 Oct
- ValidatedValidated30 Oct
- Consult.Consultation
- TargetTarget Date
- DecidedDecided11 Mar
Decided in 132 days
This is a planning application for demolition at 14 Cavendish Square London W1G 9DB. Westminster has handled 26,489 applications of this type and approves 88% of them, typically deciding them in 54 days. This one was decided in 132 days, 11 weeks longer than Westminster's median. The site is in the Harley Street conservation area, with 16 listed buildings nearby. There have been 5 other applications at this address. We hold 574 applications in total for the W1G postcode area.
Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Associated applications
- 202625 Aug
Details of railings showing adjoining fabric and key details, including detailed drawings with historic…
PendingListed building consentRelated26/05842/ADLBC - 202620 Jul
Detailed drawings of the sliding roof lights above stair leading to roof terrace showing adjoining fabric and…
PendingDischarge of conditions26/04714/ADLBC - 202530 Oct
Alterations including; demolition and alteration to roof structure including the installation of mechanical…
ApprovedApplicationFiled alongside25/07886/FULL - 202530 Oct
Alterations including; demolition and alteration to roof structure including the installation of mechanical…
This applicationApprovedListed building consent25/07887/LBC
Planning history at this site
5 other applications at this property, newest first.
- 202626 Aug
Details of doors (external) showing adjoining fabric and key details, windows showing adjoining fabric and…
ApprovedListed building consent26/05855/ADLBC - 202625 Aug
Details of photographs and specification of facing materials; external doors, windows, sliding roof lights…
ApprovedApplication26/05840/ADFULL - 20258 Aug
Details of an Operational Management Plan pursuant to Condition 3 of planning permission dated 9th April 2025…
ApprovedDischarge of conditions25/05407/ADFULL - 202518 Jun
Details Operational Management Plan pursuant to Condition 3 (A and B) of planning permission dated 09 April…
RefusedDischarge of conditions25/04137/ADFULL - 20253 Feb
Use of lower ground, ground, first, and second floors as a not-for-profit museum (Use Class F1).
ApprovedFull Planning Permission Application25/00722/FULL
Planning constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Harley Street
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
- 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 2026-10-09. 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.
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