8 - 10 Hallam Street London W1W 6JE
Approved on 2 October 2026
9 conditions
Proposal
The erection of residential rear roof extension, rear first floor extension and external terraces, adjustment of rear facade window positions, installation of a dormer window and multipane windows to No.10 to match No.12, refurbishment of all existing windows, installation of plant equipment and associated works.
- Received
- 24 July 2026
- Council
- City of Westminster
- ReceivedReceived24 Jul
- ValidatedValidated24 Jul
- Consult.Consultation
- TargetTarget Date
- DecidedDecided2 Oct
Decided in 70 days (council typically 49)
About this application
This is a full planning application for a dormer extension at 8 - 10 Hallam Street London W1W 6JE. Westminster has handled 4,484 applications of this type. This one was decided in 70 days, 3 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 4 listed buildings nearby. There have been 3 other applications 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 6JE
- Application type
- Full
- Scale / size
- Small
Planning application dates
- Date validated
- 24 July 2026
- Consultation expiry
- 26 August 2026
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.
Associated applications
- 202624 Jul
The erection of residential rear roof extension, rear first floor extension and external terraces, adjustment…
This applicationApprovedFull26/04972/FULL - 202623 Jul
Application for Prior Approval under Class MA, Part 3 of Schedule 2 of the Town and Country Planning (General…
ApprovedApplicationFiled alongside26/04929/P3JPA
Planning history at this site
5 other applications at this property, newest first.
- 20262 Nov
Registering address details for six flats and a Management office for 8 - 10 Hallam Street, London, W1W 6JE…
PendingAll OtherSNN26/00096 - 202615 Oct
Details of signed S106 Agreement secures measures to mitigate Grampian re - restrict on-street parking…
PendingDischarge of conditions26/07052/ADFULL - 202630 Mar
The erection of rear roof extension, rear first floor extension and external terraces, internal alterations…
ApprovedFull Planning Permission Application26/02096/FULL - 20259 Jun
Change of Use of 10 Hallam Street, a Commercial, Business, Services (Use Class E) to Dwellinghouses (Use…
ApprovedApplication25/03482/P3JPA - 202521 May
Change of Use of 8 Hallam Street, a Commercial, Business, Services (Use Class E) to Dwellinghouses (Use Class…
ApprovedPrior Approval Class E to Dwellings (MA)25/03481/P3JPA
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
- 8 - 10 Hallam Street London W1W 6JE26/02096/FULL · FullApproved0.0 mi
- 8 - 10 Hallam Street London W1W 6JE25/03481/P3JPA · OutlineApproved0.0 mi
- 12 Hallam Street London W1W 6JF23/02806/FULL · FullApproved0.0 mi
- Great Portland Street London25/05111/ADV · AdvertisingApproved0.0 mi
- 110 New Cavendish Street London W1W 6XR23/00067/P3JPA · OutlineApproved0.1 mi
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 ServicesVerifiedWestminsterRoofing0.7 mi
- Orient Construction Consultancy LimitedVerifiedLondon3.6 mi
- Nova Coat & PlasterVerifiedStreatham, LondonRenovations & RefurbishmentsPlastering5.6 mi
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