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11, 12, St James's Square, SW1Y 4LB

25/09241/LBCFull planning & listed building consentAwaiting decision
Full
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

External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09240/FULL)

Submitted
22 December 2025
  1. Received22 Dec
  2. Validated
  3. Consult.
  4. Target
  5. Decided

About this application

This is a planning application for a rear extension at 11, 12, St James's Square, SW1Y 4LB. Westminster has handled 666 applications of this type. It has been with the council since 22 December 2025 and is still awaiting a decision. The site is in the St James's conservation area, with 20 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.

89% of full planning & listed building consent 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 4LB
Application type
Full planning & listed building consent

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*: 11, St James'S Square Sw1On this site · +5 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.

Associated applications

  1. 2025
    22 Dec

    External and internal alterations, including the partial removal of non-heritage additions and the…

    PendingListed building consentPart of25/09240/FULL
  2. 2025
    22 Dec

    External and internal alterations, including the partial removal of non-heritage additions and the…

    This applicationPendingListed building consent25/09241/LBC

Source: Westminster

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

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For applicants and trades

Before the decision

You may need a heritage statement. Heritage & archaeology consultants near this site

This is an application for listed building consent.

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Nearest first, within 25 miles of the site. Every firm is listed free.

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