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128, Mount Street, London, W1K 3NU

25/05410/FULLFull planning & listed building consentApproved
Full

Approved on 23 October 2025

Approximate site (title boundary)
Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail

Submitted
1 August 2025
  1. Received1 Aug
  2. Validated
  3. Consult.
  4. Target
  5. Decided23 Oct

Decided in 83 days (council typically 49)

About this application

This is a planning application at 128, Mount Street, London, W1K 3NU. Westminster has handled 666 applications of this type. This one was decided in 83 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 469 applications across WEW_22. We hold 886 applications in total for the W1K postcode area.

89% of full planning & listed building consent 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 3NU
Application type
Full planning & listed building consent

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: 125-9, Mount Street W1On this site · +2 more
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • Brownfield land register: 21 - 23 Farm Street London W1J 5RGRegister site at or near this address
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (20)

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 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.

Associated applications

  1. 2025
    1 Aug

    Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with…

    This applicationApprovedListed building consent25/05410/FULL
  2. 2025
    1 Aug

    Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with…

    ApprovedListed building consentRelated25/05411/LBC
  3. 2025
    30 Jul

    128 Mount Street Condition 4a and 4b

    ApprovedDischarge of conditionsFiled alongside25/05025/ADLBC

Planning history at this site

8 other applications at this property, newest first.

  1. 2025
    18 Jul

    Submission of photographs to show planning approval had been demonstrably implemented at 119A Mount Street…

    ApprovedAll Other25/05004/ADFULL
  2. 2025
    2 Jul

    Details of waste and recycling storage pursuant to Condition 7 of planning permission dated 7th January 2025…

    ApprovedDischarge of conditions25/04553/ADFULL
  3. 2025
    25 Jun

    Details of windows, screen and rooflight pursuant to Condition 6 of planning permission dated 07 January 2025…

    ApprovedDischarge of conditions25/04323/ADFULL
  4. 2025
    20 May

    Details of new pipe and service runs serving the kitchen, bathroom and air conditioning equipment and any new…

    RefusedListed building consent25/03215/ADLBC
  5. 2025
    2 May

    Registering new address details for unit , St. Anslem Development Co Ltd, 128 Mount Street, London, W1K 3NU…

    ApprovedAll OtherSNN25/00030
  6. 2025
    28 Apr

    Details of staircase and provision of a jib door on the original party wall with treatment to match the rooms…

    ApprovedListed building consent25/02922/ADLBC

Source: Westminster

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

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