12 Hallam Street London W1W 6JF
Approved on 28 July 2023
Council decision: Application PermittedDelegated (officer decision)
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
Replacement of windows with double glazed timber windows; installation of air conditioning unit at roof level; and addition of a rear extension at part third, fourth and fifth floors; and associated works, all in connection with the existing hotel use.
- Received
- 27 April 2023
- Decision level
- Delegated (officer decision)
- Public comments
- 1
- Council
- City of Westminster
- Ward
- West End
- Agent
- Robson Warren Architects Ltd
- ReceivedReceived27 Apr
- ValidatedValidated27 Apr
- Consult.Consultation
- TargetTarget Date22 Jun
- DecidedDecided28 Jul
Decided in 92 days (council typically 49)
About this application
This is a full planning application for a rear extension at 12 Hallam Street London W1W 6JF. Westminster has handled 4,484 applications of this type. This one was decided in 92 days, 6 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 3 listed buildings nearby. There are no previous applications recorded at this address. In the past year there have been 484 applications across West End. We hold 251 applications in total for the W1W 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.See what's approved near your address
Application details
- Postcode
- W1W 6JF
- Application type
- Full Planning Permission Application
- Scale / size
- Small
Planning application dates
- Date validated
- 27 April 2023
- Consultation expiry
- 7 June 2023
- Target decision date
- 22 June 2023
Applicant and agent
- Agent
- Robson Warren Architects Ltd
- Architect profile
- ROBSON WARREN ARCHITECTS LTD.
- Agent address
- 8 Northfields Prospect Putney Bridge Road London SW18 1PE
Planning decision
- Statutory period
- 56 days
Publicity
- Last advertised
- 17 May 2023
- Advertisement expiry
- 7 June 2023
- Site notice start
- 4 May 2023
- Site notice end
- 25 May 2023
Additional information
- Planning Portal ID
- PP-12057125
- Documents
- 42
Site constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Harley Street
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (22)
flood storage areas, listed buildings, 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.
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
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For applicants and trades
Contractors near this project
Find contractors for extensions near this site- Atlas South Technical Service LimitedVerifiedLondonProperty MaintenanceHandyman0.3 mi
- Avent Roofing ServicesVerifiedWestminsterRoofing0.8 mi
- Orient Construction Consultancy LimitedVerifiedLondon3.6 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.6 mi
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