Skip to content

15 - 19 Cavendish Place London W1G 0QE

26/02380/FULLApproved

Approved on 24 June 2026

Site boundary (council red line)

Proposal

Erection of two storey mansard roof extension with associated dormer windows, plus extension on sixth floor to provide additional office (Class E) accommodation including plant space and green roof, infill of courtyards at ground and lower ground floors, extensions within southeast corner at first-fifth floor levels to provide terraces and an external staircase to rear of building, new glazing to existing windows, new shopfront with lowered cills for new active frontage at ground floor level.

Submitted
10 April 2026
  1. Received10 Apr
  2. Validated
  3. Consult.
  4. Target
  5. Decided24 Jun

Decided in 75 days

About this application

This is a planning application for a dormer extension at 15 - 19 Cavendish Place London W1G 0QE. Westminster has handled 27,108 applications of this type. This one was decided in 75 days, 4 weeks longer than Westminster's typical decision time. The site is in the Regent Street conservation area, with 13 listed buildings nearby. There has been 1 other application at this address. We hold 590 applications in total for the W1G postcode area.

Application details

Postcode
W1G 0QE

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Harley StreetPart of the site · +1 more
  • Listed building: Grade II: Number 7 and Attached RailingsOn or next to 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.

Source: Westminster

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

Track this application

Get email alerts when there is a planning decision or status change.

Get email alerts near W1G

New planning applications delivered to your inbox daily.

Around this site

Discuss this application on r/PlanningPermissionUK

For applicants and trades

Planning something similar?

See what the council approved and refused on your street for the project you have in mind. Pick your home and get the evidence before you pay for drawings.

See what gets approved on your streetBuying this property? Report on this address