20, Carlton House Terrace, London, SW1Y 5AN

25/05651/FULLFull planning permissionApproved

Full

Approved on 4 November 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

Retrospective full application for the installation of pergola structure at L8 terrace, new bi-fold doors at L8 terrace and new louvres at ground floor level fronting Cockspur Court and Warwick Street.

Submitted: 18 September 2025
Council: City of Westminster

ReceivedSubmitted18 Sep
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided4 Nov

Decided in 47 days (council typically 49)

About this application

This is a planning application at 20, Carlton House Terrace, London, SW1Y 5AN. Westminster has handled 804 applications of this type. This one was decided in 47 days. The site is in the St James's conservation area, with 17 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 276 applications across SJW_22. We hold 969 applications in total for the SW1Y postcode area.

84% of full planning permission 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: SW1Y 5AN
Application type: Full planning permission

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Conservation area: St James's
Listed building: Grade II: The Royal Marines MemorialOn or next to this site · +1 more
Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
Registered park and garden: St James'S ParkPart of the site
Brownfield land register: Admiralty Arch The Mall London SW1A 2DYRegister site at or near this address
Flood zone 1: Low probability (rivers and sea)

Also checked, none recorded (19)

flood storage areas, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, 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 and heritage coasts.

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.

Planning history at this site

14 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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