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43 - 45 Portman Square London W1H 6LY

26/04951/NMAApproved
Discharge / amendments

Approved on 5 August 2026

Council decision: Application Permitted

Site boundary (council red line)

Proposal

Amendments to planning permission dated 22 April 2026 (Ref: 25/06153/FULL) for, 'Partial demolition of the existing roof and removal of plant equipment; construction of a roof extension providing new office (Class E) floorspace with associated external amenity spaces and plant equipment; refurbishment of the existing building, including infilling of the existing atrium; alterations to the existing façade; provision of cycle parking spaces and end of journey facilities, and all associated and ancillary works'; NAMELY, to amend the wording of Condition 27 to allow basement demolition work to proceed in advance of sustaianble drainage construction drawings being approved.

Received
23 July 2026
  1. Received23 Jul
  2. Validated23 Jul
  3. Consult.
  4. Target
  5. Decided5 Aug

Decided in 13 days

About this application

This is a planning application for demolition at 43 - 45 Portman Square London W1H 6LY. Westminster has handled 27,108 applications of this type. This one was decided in 13 days, 5 weeks quicker than Westminster's typical decision time. The site is in the Portman Estate conservation area, with 1 listed building nearby. There have been 4 other applications at this address. We hold 896 applications in total for the W1H postcode area.

Application details

Postcode
W1H 6LY

Planning application dates

Date validated
23 July 2026

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Portman Estate
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (22)

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, 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.

Planning history at this site

6 other applications at this property, newest first.

  1. 2026
    15 Jul

    Details of accurate and verified estimates of the 'Be Seen' energy performance indicators for the Development…

    ApprovedApplication26/04721/ADFULL
  2. 2026
    5 Feb

    43-45 Portman Square Condition Discharge 26

    ApprovedDischarge of conditions26/00710/ADFULL
  3. 2026
    5 Feb

    Details of Construction Logistics Plan to clarify that TfL's assets and services are not adversely affected…

    ApprovedDischarge of conditions26/00709/ADFULL
  4. 2026
    5 Feb

    Details of signed Appendix A of the council's Code of Construction Practice pursuant to Condition 19 of…

    ApprovedDischarge of conditions26/00708/ADFULL
  5. 2025
    4 Jul

    43-45 Portman Square (Project Padme) NMA 1

    RefusedNon-material amendment25/04609/NMA
  6. 2025
    2 May

    Details of accurate and verified estimates of the 'Be Seen' energy performance indicators for the Development…

    ApprovedDischarge of conditions25/03065/ADFULL

Source: Westminster

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

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