17 Hertford Street London W1J 7RS
Proposal
Internal alterations to the basement including new lightweight timber-stud partitions to reorganise the existing basement layout; Installation of new sanitaryware in a newly configured bathroom; Replacement of modern kitchen fittings; and Installation of traditional four-panel timber doors, architraves and ironmongery designed to match existing doors.
- Received
- 9 September 2026
- Decided
- 30 September 2026
- Council
- City of Westminster
- ReceivedSubmitted9 Sep
- ValidatedValidated9 Sep
- Consult.Consultation
- TargetTarget Date
- DecidedDecided30 Sep
Decided in 21 days
This is a planning application 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 21 days, 5 weeks quicker than Westminster's median. The site is in the Mayfair conservation area, with 16 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
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster
Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.
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Planning history at this site
8 other applications at this property, newest first.
- 202611 Jun
Replacement of the mansard infill extension to the south east of the property by extending the existing bay…
ApprovedFull26/03409/FULL - 202611 Jun
Replacement of the mansard infill extension to the south east of the property by extending the existing bay…
ApprovedListed building consent26/03410/LBC - 202622 May
Details of all new windows / reduction in size of dormer windows / facing materials pursuant to conditions 4…
ApprovedListed building consent26/03484/ADLBC - 202622 May
Details of all new windows / reduction in size of dormer windows / facing materials pursuant to conditions 4…
ApprovedDischarge of conditions26/03406/ADFULL - 202628 Apr
Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard…
WithdrawnFull Planning Permission Application26/02817/FULL - 202628 Apr
Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard…
WithdrawnListed building consent26/02818/LBC - 20256 Nov
Internal reconfigurations, restoration and associated works.
ApprovedListed building consent25/07828/LBC - 20256 Nov
Addition of a fourth-floor mansard roof to allow for the creation of a one-bedroom apartment for short term…
WithdrawnApplication25/07827/FULL
Planning constraints
Designations that overlap or adjoin the site outline.
- Conservation area: Mayfair
- 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.
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 2026-10-09. 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.
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