3 St James's Square London SW1Y 4JU
Approved on 19 May 2026
Proposal
Alterations to the St. James's Square facade including replacement of windows and entrances, at main roof level addition of roof pavilion extension, plant equipment and enclosures, with roof terraces at eight and ninth floor levels and a rear extension to accommodate a lift shaft and associated works.
- Received
- 12 February 2026
- Public comments
- 3
- Council
- City of Westminster
- Ward
- St James's
- Agent
- Newmark Gerald Eve LLP
- ReceivedReceived12 Feb
- ValidatedValidated12 Feb
- Consult.Consultation
- TargetTarget Date9 Apr
- DecidedDecided19 May
Decided in 96 days (council typically 49)
About this application
This is a full planning application for a rear extension at 3 St James's Square London SW1Y 4JU. Westminster has handled 4,484 applications of this type. This one was decided in 96 days, 7 weeks longer than Westminster's typical decision time. The site is in the St James's conservation area, with 11 listed buildings nearby. There have been 3 other applications at this address. In the past year there have been 475 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 4JU
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 12 February 2026
- Consultation expiry
- 15 April 2026
- Target decision date
- 9 April 2026
Applicant and agent
- Agent
- Newmark Gerald Eve LLP
- Agent address
- Newmark Gerald Eve LLP One Fitzroy Place 6 Mortimer Street London W1T 3JJ United Kingdom
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 25 March 2026
- Advertisement expiry
- 15 April 2026
Additional information
- Planning Portal ID
- PP-14633935
- Documents
- 25
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Regent StreetPart of the site · +1 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.
© 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.
- 202527 Nov
Replacement and enlargement of one existing rooflight.
ApprovedFull Planning Permission Application25/08682/FULL - 202515 Aug
Extension of lift overrun at roof level and associated works.
ApprovedFull planning permission25/05780/FULL - 201431 Jan
Alterations to ground floor facade at basement and ground floor levels including creation of second street…
ApprovedApplication for full Planning Permission14/00869/FULL - 200225 Sep
Display for a temporary period of six months of a non-illuminated 'to let' board located on the face of the…
ApprovedAdvertisement consent02/07435/AD7
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
- 3 St James's Square London SW1Y 4JU25/08682/FULL · FullApproved0.0 mi
- 3 St James's Square London SW1Y 4JU02/07435/AD7 · AdvertisingApproved0.0 mi
- 3 St James's Square London SW1Y 4JU14/00869/FULL · FullApproved0.0 mi
- 7 St James's Square London SW1Y 4JU23/03978/ADLBC · ConditionsRefused0.0 mi
- 4 St James's Square London SW1Y 4JU17/06951/FULL · FullApproved0.0 mi
For applicants and trades
Consultants on this application
- Newmark Gerald Eve LLP · Agent for this application
Contractors near this project
Find contractors for extensions near this site- Avent Roofing ServicesVerifiedWestminsterRoofing0.3 mi
- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman1.1 mi
- Orient Construction Consultancy LimitedVerifiedLondon3.8 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering4.8 mi
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