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Second Floor 16 Conduit Street London W1S 2XL

26/01173/CLOPUDApproved

Approved on 26 June 2026

Council decision: Application Permitted

Site boundary (council red line)

Proposal

Confirmation of the lawfulness of the proposed residential use on the second floor of the property, in line with planning permission ref: 15/06533/FULL for "Dual/alternative use of the second floor for either office (Class B1a) or residential (Class C3) use (1 x 2 bedroom unit). Installation of 4 x external grilles at second floor level on the Mill Street elevation and 1 x external grille on Conduit Street elevation" granted 7 June 2016.

Received
24 February 2026
  1. Received24 Feb
  2. Validated24 Feb
  3. Consult.
  4. Target
  5. Decided26 Jun

Decided in 122 days

About this application

This is a planning application at Second Floor 16 Conduit Street London W1S 2XL. Westminster has handled 27,078 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 Mayfair conservation area, with 13 listed buildings nearby. There has been 1 other application at this address. We hold 791 applications in total for the W1S postcode area.

Application details

Postcode
W1S 2XL

Planning application dates

Date validated
24 February 2026

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: Mayfair
  • 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.

Source: Westminster

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

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