126-134 Baker Street London W1U 6SH
Proposal
Confirmation that the proposed works to the front entrance are sufficient to constitute implementation of the planning permission dated 10 November 2015 (RN 15/07396/FULL) for the erection of three storey extension at the rear of the building at second, third and fourth floor level and use of enlarged second to fourth floors at 11 flats (Class C3). Installation of plant within existing roof top plant room and plant within existing stairwell at roof level. Installation of photovoltaic panels and living roof at roof level and new entrance doors at ground floor level.
- Received
- 8 August 2018
- Decided
- 22 August 2018 · Application Permitted
- Decision level
- Delegated (officer decision)
- Council
- City of Westminster
- Ward
- Marylebone High Street
- ReceivedSubmitted8 Aug
- ValidatedValidated8 Aug
- Consult.Consultation
- TargetTarget Date3 Oct
- DecidedDecided22 Aug
Decided in 14 days (council typically 49)
This is an outline application for an extension at 126-134 Baker Street London W1U 6SH. Westminster has handled 218 applications of this type and approves 85% of them, typically deciding them in 52 days. This one was decided in 14 days, 5 weeks quicker than Westminster's median. The site is in the Portman Estate conservation area, with 4 listed buildings nearby. There are no previous applications recorded at this address. We hold 1,036 applications in total for the W1U 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 history at this site
7 other applications at this property, newest first.
- 202613 Oct
Details of signed appendix A checklist and SEMP pursuant to condition 13 of planning permission dated 18th…
PendingApplication26/06112/ADFULL - 202610 Sep
Details of the mechanical ventilation system pursuant to condition 12 of planning permission dated 18th…
PendingApplication26/06191/ADFULL - 202610 Jul
Amendments to planning permission dated 10th November 2015 (RN:15/07396/FULL
ApprovedNon-material amendment26/04634/NMA - 202417 Jul
Use of first floor level as Class C3 to provide new residential accommodation and use of ground floor as…
PendingFull Planning Permission Application24/04851/FULL - 202417 Jul
Use of first floor level as Class C3 to provide new residential accommodation and from Class E to Class C3 at…
PendingFull Planning Permission Application24/04852/FULL - 201826 Jun
Details of doors at 126 Baker Street to partially discharge condition 13 of planning permission dated 10…
ApprovedDischarge of conditions18/05385/ADFULL - 201815 Mar
Details pursuant to Conditions 17 and 18 of planning permission dated 10 November 2015 (RN: 15/07396/FULL
ApprovedDischarge of conditions18/02171/ADFULL
Planning constraints
Designations at the address point. Ones next to the site may also apply.
- Conservation area: Portman Estate
- Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
- Brownfield land register: 126 - 134 Baker Street, London, W1U 6SHRegister site at or near this address
- Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)
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 and heritage coasts.
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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