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The Westbury Hotel 37 Conduit Street London W1S 2YF

26/00721/NMAApproved

Approved on 12 March 2026

Council decision: Application Permitted

Site boundary (council red line)

Proposal

Amendments to planning permission dated 29 November 2024 (RN: 24/06866/FULL) for Erection of a ninth floor extension with terraces accessible from the new accommodation. Erection of a fire escape stair/hatch and installation of railing to fire escape route at ninth floor level. Installation of photovoltaics to ninth floor and to the roof of additional accommodation. All in connection with the enlargement and retrofit of the existing hotel (Class C1). NAMELY, to alter the approved balustrade around the roof terrace from metal to glass, alter access point to terrace

Received
6 February 2026
  1. Received6 Feb
  2. Validated6 Feb
  3. Consult.
  4. Target
  5. Decided12 Mar

Decided in 34 days

About this application

This is a planning application for an extension at The Westbury Hotel 37 Conduit Street London W1S 2YF. Westminster has handled 27,108 applications of this type. This one was decided in 34 days, 2 weeks quicker than Westminster's typical decision time. The site is in the Mayfair conservation area, with 20 listed buildings nearby. There have been 14 other applications at this address. We hold 791 applications in total for the W1S postcode area.

Application details

Postcode
W1S 2YF

Planning application dates

Date validated
6 February 2026

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Mayfair
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • Brownfield land register: 25 Savile Row London W1S 2ESRegister 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 2026-11-03. 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.

Planning history at this site

17 other applications at this property, newest first.

  1. 2026
    23 Sep

    Details of new windows, metal and stone framework for the Conduit Street facade pursuant to condition 15 of…

    RefusedApplication26/06518/ADFULL
  2. 2026
    24 Aug

    Details of a supplementary acoustic report pursuant to condition 7 of planning permission dated 24th June…

    ApprovedApplication26/05771/ADFULL
  3. 2026
    24 Aug

    Details of a supplementary acoustic report pursuant to condition 7 of Planning Permission dated 25th February…

    ApprovedApplication26/05770/ADFULL
  4. 2026
    30 Mar

    Details of windows and the metal and stone framework pursuant to Condition 15 of planning permission dated…

    ApprovedDischarge of conditions26/02090/ADFULL
  5. 2026
    30 Mar

    Detailed drawings showing the following alteration to the scheme: a planting scheme within the new terrace at…

    ApprovedDischarge of conditions26/02089/ADFULL
  6. 2026
    12 Mar

    Variation of Condition 18 of planning permission dated 15th November 2024 (RN 24/02402/FULL

    ApprovedVariation of conditions (s73)26/01630/FULL

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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