17 Hertford Street London W1J 7RS

25/07827/FULLWithdrawn

Proposal

Addition of a fourth-floor mansard roof to allow for the creation of a one-bedroom apartment for short term letting purposes, replacement of windows at third floor level, internal and external restoration, redecoration and minor reconfigurations and other associated works. (Linked 25/07828/LBC)

Received: 6 November 2025
Decided: 26 February 2026 · Application Withdrawn
Council: City of Westminster

Site boundary (council red line)

ReceivedSubmitted6 Nov
ValidatedValidated6 Nov
Consult.Consultation
TargetTarget Date
DecidedDecided26 Feb

Decided in 112 days

This is a planning application for window replacement at 17 Hertford Street London W1J 7RS. Westminster has handled 26,489 applications of this type and approves 88% of them, typically deciding them in 54 days. This one was decided in 112 days, 8 weeks longer than Westminster's median. The site is in the Mayfair conservation area, with 17 listed buildings nearby. There have been 8 other applications at this address. We hold 914 applications in total for the W1J postcode area.

Application Details

Reference

25/07827/FULL

Address

17 Hertford Street London W1J 7RS

Postcode

W1J 7RS

Local Authority

Westminster

Decision Status

Withdrawn

Applicant & Agent

Planning Application Dates

Date Received

29 October 2025

Date Decided

26 February 2026

Date Validated

6 November 2025

Date Submitted

6 November 2025

Planning Decision

Decision

Application Withdrawn

Publicity

Appeal

Additional Information

Coordinates

51.505478, -0.148802

Enriching application data

2/3

Council recordsAppealsFlood risk

Source: Westminster

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

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Associated applications

2025
6 Nov
Addition of a fourth-floor mansard roof to allow for the creation of a one-bedroom apartment for short term…
This applicationWithdrawnApplication25/07827/FULL
2025
6 Nov
Internal reconfigurations, restoration and associated works.
ApprovedListed building consentPart of25/07828/LBC

Planning history at this site

7 other applications at this property, newest first.

Planning constraints

Designations that overlap or adjoin the site outline.

Conservation area: Mayfair
Listed building: Grade II: 17, Hertford Street W1On this site · +3 more
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.

© 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 2026-10-09. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

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