14 Cavendish Square London W1G 9DB

25/00722/FULLFull Planning Permission ApplicationApproved

Full

Approved on 9 April 2025

Approximate site (title boundary)

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

Use of lower ground, ground, first, and second floors as a not-for-profit museum (Use Class F1).

Received: 3 February 2025
Council: City of Westminster
Ward: Marylebone

ReceivedReceived3 Feb
ValidatedValidated3 Feb
Consult.Consultation
TargetTarget Date31 Mar
DecidedDecided9 Apr

Decided in 65 days (council typically 49)

About this application

This is a full planning application at 14 Cavendish Square London W1G 9DB. Westminster has handled 4,484 applications of this type. This one was decided in 65 days, 2 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 16 listed buildings nearby. There have been 5 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 9DB
Application type: Full Planning Permission Application
Scale / size: Small

Planning application dates

Date validated: 3 February 2025
Target decision date: 31 March 2025

Applicant and agent

Agent: DP9
Agent address: 100 Pall Mall London SW195NQ United Kingdom

Planning decision

Statutory period: 56 days

Additional information

Planning Portal ID: PP-13684663
Comments: 0
Documents: 10

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Conservation area: Harley Street
Listed building: Grade II: 15, Cavendish Square W1On or next to this site · +3 more
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 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

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

2025
8 Aug
Details of an Operational Management Plan pursuant to Condition 3 of planning permission dated 9th April 2025…
ApprovedDischarge of conditions25/05407/ADFULL
2025
3 Feb
Use of lower ground, ground, first, and second floors as a not-for-profit museum (Use Class F1).
This applicationApprovedFull25/00722/FULL

Planning history at this site

7 other applications at this property, newest first.

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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