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79 Harley Street London W1G 9HW

25/09214/FULLApproved
Discharge / amendments

Approved on 20 April 2026

Council decision: Application Permitted

Site boundary (council red line)

Proposal

Variation of conditions 1 and 5 of planning permission dated 31 August 2023 (RN: 23/04631/FULL) for the: External and internal alterations at lower ground, ground and first floor rear flat roof level associated with the installation of a new MR Linac machine at lower ground floor level. Installation of new plant and relocation of existing plant, including a quench pipe within the external area at rear ground floor level and on the first floor flat roof area, the removal of skylight and associated works. NAMELY, to allow internal and external amendments and the installation of additional plant.

Received
19 December 2025
  1. Received19 Dec
  2. Validated19 Dec
  3. Consult.
  4. Target
  5. Decided20 Apr

Decided in 122 days

About this application

This is a planning application at 79 Harley Street London W1G 9HW. Westminster has handled 27,140 applications of this type. This one was decided in 122 days, 10 weeks longer than Westminster's typical decision time. The site is in the Harley Street conservation area, with 20 listed buildings nearby. There have been 2 other applications at this address. We hold 590 applications in total for the W1G postcode area.

Application details

Postcode
W1G 9HW

Planning application dates

Date validated
19 December 2025

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: 79 and 81, Harley Street W1On this site · +2 more
  • 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. 2025
    22 Dec

    Internal alterations at basement and ground floor levels and external alterations including the removal of…

    ApprovedListed building consentFiled alongside25/09253/LBC
  2. 2025
    19 Dec

    Variation of conditions 1 and 5 of planning permission dated 31 August 2023 (RN: 23/04631/FULL

    This applicationApprovedVariation of conditions (s73)25/09214/FULL

Source: Westminster

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

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