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11 Mount Street London W1K 2RB

26/01869/FULLFull Planning Permission ApplicationApproved
Full

Approved on 18 June 2026

Site boundary (council red line)

Proposal

Installation of automatic opening fire vent at top floor of 11 Mount Street accommodation and fire exit stair core to residential apartments which occupy 1st floor to roof level. [Linked to 26/01651/LBC]

Received
23 March 2026
Ward
West End
Agent
Blair Associates Architecture Ltd
  1. Received23 Mar
  2. Validated15 Apr
  3. Consult.
  4. Target10 Jun
  5. Decided18 Jun

Decided in 64 days (council typically 49)

About this application

This is a full planning application at 11 Mount Street London W1K 2RB. Westminster has handled 4,484 applications of this type. This one was decided in 87 days, 5 weeks longer than Westminster's typical decision time. The site is in the Mayfair conservation area, with 13 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 484 applications across West End. We hold 886 applications in total for the W1K 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
W1K 2RB
Application type
Full Planning Permission Application
Scale / size
Small

Planning application dates

Date validated
15 April 2026
Consultation expiry
1 June 2026
Target decision date
10 June 2026

Applicant and agent

Agent
Blair Associates Architecture Ltd
Architect profile
BLAIR ASSOCIATES ARCHITECTURE LTD
Agent address
88 Golden Lane London London EC1Y 0UA United Kingdom

Planning decision

Statutory period
56 days

Publicity

Site notice start
11 May 2026
Site notice end
1 June 2026

Additional information

Planning Portal ID
PP-14793359
Comments
0
Documents
16

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Mayfair
  • Listed building: Grade II: 10-12, Mount Street W1On this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)

flood storage areas, 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

  1. 2026
    15 Apr

    Installation of automatic opening fire vent at top floor of 11 Mount Street accommodation and fire exit stair…

    ApprovedListed building consentPart of26/01651/LBC
  2. 2026
    23 Mar

    Installation of automatic opening fire vent at top floor of 11 Mount Street accommodation and fire exit stair…

    This applicationApprovedFull26/01869/FULL

Source: Westminster

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

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