126 - 134 Baker Street London W1U 6SH

26/04634/NMAPermitted

Proposal

Amendments to planning permission dated 10th November 2015 (RN:15/07396/FULL) for 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 as 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. Namely, changes to the extension at the rear of the building to alter the external appearance from a brick finish to a render finish, removal of two windows to side elevation to the extension to the rear of the building, replacement of existing retained windows to rear elevation (in lieu of installation of secondary internal glazing) and removal of the cycle store at second floor level.

Received: 10 July 2026
Decided: 8 September 2026
Council: City of Westminster

Site boundary (council red line)

ReceivedSubmitted10 Jul
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided8 Sep

Decided in 60 days

This is a planning application for an extension at 126 - 134 Baker Street London W1U 6SH. Westminster has handled 26,489 applications of this type and approves 88% of them, typically deciding them in 54 days. This one was decided in 60 days, 6 days longer than Westminster's median. The site is in the Portman Estate conservation area, with 4 listed buildings nearby. There have been 6 other applications at this address. We hold 1,036 applications in total for the W1U postcode area.

Application Details

Reference

26/04634/NMA

Address

126 - 134 Baker Street London W1U 6SH

Postcode

W1U 6SH

Local Authority

Westminster

Decision Status

Permitted

Applicant & Agent

Planning Application Dates

Date Decided

8 September 2026

Date Submitted

10 July 2026

Planning Decision

Publicity

Appeal

Additional Information

Coordinates

51.521732, -0.157037

Enriching application data

2/3

Council recordsAppealsFlood risk

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

8 other applications at this property, newest first.

Planning constraints

Designations that overlap or adjoin the site outline.

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.

© 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.

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