20 - 21 St James's Square London SW1Y 4JH
Proposal
Works to facilitate the use of No. 20 as an independent office building. Office refurbishment and internal alterations to No. 21 (Class B1a Use); Replacement rooftop fire escape and plant enclosure; replacement rooflights and windows to Cleveland Place; Facade cleaning, building maintenance and associated works.
- Received
- 28 January 2016
- Decided
- 3 May 2016 · Application Permitted
- Decision level
- Delegated (officer decision)
- Council
- City of Westminster
- Ward
- St James's
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.
- ReceivedSubmitted28 Jan
- ValidatedValidated28 Jan
- Consult.Consultation
- TargetTarget Date24 Mar
- DecidedDecided3 May
Decided in 96 days (council typically 49)
This is a full planning application for window replacement at 20 - 21 St James's Square London SW1Y 4JH. Westminster has handled 4,496 applications of this type and approves 85% of them, typically deciding them in 74 days. This one was decided in 96 days, 3 weeks longer than Westminster's median. The site is in the St James's conservation area, with 14 listed buildings nearby. There are no previous applications recorded at this address. In the past year there have been 558 applications across St James's. We hold 961 applications in total for the SW1Y postcode area.
Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Planning constraints
Designations that overlap or adjoin the site outline.
- Conservation area: St James's
- 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 2026-10-09. 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.
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