8 - 9 William Street London SW1X 9HL

25/08735/LBCApproved

Approved on 26 March 2026

Site boundary (council red line)

Proposal

Installation of air-conditioning plant and acoustic enclosure to the rear lower ground courtyard. Alterations to the rear lower ground floor elevation.

Submitted: 1 December 2025
Council: City of Westminster

ReceivedSubmitted1 Dec
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided26 Mar

Decided in 115 days

About this application

This is a planning application at 8 - 9 William Street London SW1X 9HL. Westminster has handled 27,108 applications of this type. This one was decided in 115 days, 9 weeks longer than Westminster's typical decision time. The site is in the Albert Gate conservation area, with 7 listed buildings nearby. There have been 7 other applications at this address. We hold 1,285 applications in total for the SW1X postcode area.

Application details

Postcode: SW1X 9HL

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Conservation area: Albert Gate
Listed building: Grade II: 5-12, William Street W1On or next to this site · +1 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.

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.

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

2025
1 Dec
Installation of air conditioning plant and acoustic enclosure to the rear lower ground courtyard. Alterations…
ApprovedApplicationFiled alongside25/08734/FULL
2025
1 Dec
Installation of air-conditioning plant and acoustic enclosure to the rear lower ground courtyard. Alterations…
This applicationApprovedListed building consent25/08735/LBC

Planning history at this site

11 other applications at this property, newest first.

Source: Westminster

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

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