1 Carlton House Terrace London SW1Y 5AF

25/04930/FULLFull Planning Permission ApplicationApproved

Full

Approved on 14 August 2026

16 conditions

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

Variation of conditions 1, 4, 9, removal of conditions 11 and 12 of planning permission dated 28 April 2021 (RN: 21/01191/FULL) as amended by non-material amendment dated 04 September 2025 (RN: 25/05079/NMA), which is a variation of earlier permissions for use of the building as a single residential dwelling (Class C3) with associated internal and external alterations including erection of a sun room with terrace at roof level, partial infill of rear lightwell at basement level and car port enclosure. NAMELY, minor design changes, relocation of the bin store and to install a new bin lift in the front lightwell, re-location the plant and from main roof level into the side lightwell and to install associated screening, revisions to the roof level extension, landscaping and boundary treatments to accommodate a new plant enclosure and provision of details pursuant to the conditions listed above. (Linked to 25/04929/LBC)

Received: 16 July 2025
Public comments: 3
Council: City of Westminster
Ward: St James's
Agent: Blake Morgan LLP

ReceivedReceived16 Jul
ValidatedValidated16 Jul
Consult.Consultation
TargetTarget Date10 Sep
DecidedDecided14 Aug

Decided in 394 days (council typically 49)

About this application

This is a full planning application for an extension at 1 Carlton House Terrace London SW1Y 5AF. Westminster has handled 4,484 applications of this type. This one was decided in 394 days, 49 weeks longer than Westminster's typical decision time. The site is in the St James's conservation area, with 9 listed buildings nearby. There have been 7 other applications at this address. In the past year there have been 478 applications across St James's. We hold 969 applications in total for the SW1Y 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: SW1Y 5AF
Application type: Full Planning Permission Application
Scale / size: Small

Planning application dates

Date validated: 16 July 2025
Consultation expiry: 27 August 2025
Target decision date: 10 September 2025

Applicant and agent

Agent: Blake Morgan LLP
Agent address: 6 New Street Square London EC4A 3DJ United Kingdom

Planning decision

Statutory period: 56 days

Publicity

Last advertised: 6 August 2025
Advertisement expiry: 27 August 2025

Additional information

Planning Portal ID: PP-14175418
Documents: 31

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*: 1, Carlton Gardens Sw1On this site · +10 more
Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
Tree Preservation Order: Ref W615Protected 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.

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
22 Jul
Variation of condition 1 of planning permission dated 28 April 2021 (RN: 21/01191/FULL
ApprovedNon-material amendmentPart of25/05079/NMA
2025
16 Jul
External alterations and internal alterations, including re-location of a bin store and installation of a new…
ApprovedListed building consentPart of25/04929/LBC
2025
16 Jul
Variation of conditions 1, 4, 9, removal of conditions 11 and 12 of planning permission dated 28 April 2021…
This applicationApprovedVariation of conditions (s73)25/04930/FULL

Planning history at this site

13 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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