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34 Portland Place London W1B 1LX

25/09187/LBCApproved

Approved on 15 October 2026

Site boundary (council red line)

Proposal

Use of 34 Portland Place primarily as the Ambassador's dwellinghouse, use of 73 New Cavendish Street as a Polish cultural centre and diplomatic premises, and associated alterations and extensions. [Linked to 25/09186/FULL]

Received
19 December 2025
  1. Received19 Dec
  2. Validated20 Feb
  3. Consult.
  4. Target
  5. Decided15 Oct

Decided in 237 days

About this application

This is a planning application for a new dwelling at 34 Portland Place London W1B 1LX. Westminster has handled 27,108 applications of this type. This one was decided in 237 days, 27 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 10 listed buildings nearby. There has been 1 other application at this address. We hold 372 applications in total for the W1B postcode area.

Application details

Postcode
W1B 1LX

Planning application dates

Date validated
20 February 2026

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Harley Street
  • Listed building: Grade II: 73, New Cavendish Street W1On this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • 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
    28 Oct

    Details of samples of the facing materials you will use, including glazing, and elevations and roof plans…

    PendingAll OtherRelated26/07337/ADFULL
  2. 2026
    20 Feb

    Use of 34 Portland Place primarily as the Ambassador's dwellinghouse, use of 73 New Cavendish Street as a…

    ApprovedApplicationPart of25/09186/FULL
  3. 2026
    20 Feb

    Use of 34 Portland Place primarily as the Ambassador's dwellinghouse, use of 73 New Cavendish Street as a…

    This applicationApprovedListed building consent25/09187/LBC

Source: Westminster

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

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