Planning application
25/08735/LBC
8 - 9 William Street London SW1X 9HL
Proposal
Installation of air-conditioning plant and acoustic enclosure to the rear lower ground courtyard. Alterations to the rear lower ground floor elevation.
As published by the council, reference 25/08735/LBC
Timeline
Dates from the published record
-
1 Dec 2025
Received by Westminster
-
26 Mar 2026
Decision issued: Application Permitted
-
1 Aug 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About heritage and listed buildings applications
How this application type works
Heritage applications concern listed buildings and conservation areas. Listed building consent is needed for works, inside or out, that affect the special interest of a listed building, and carrying out such works without consent is a criminal offence. The council weighs harm to the heritage asset against any public benefit of the proposal.
More on heritage and listed buildings applications in our guide
Nearby applications
Within 500 metres
-
25/08734/FULL Granted
8 - 9 William Street London SW1X 9HL
Installation of air conditioning plant and acoustic enclosure to the rear lower ground courtyard. Alterations to the rear lower ground floor elevation.
-
26/00188/TCH Awaiting decision
8 - 9 William Street London SW1X 9HL
Use of an area of pavement (part public highway and part private forecourt) measuring 3.44 m x 12.68 m for the placing of 8 tables, 24 chairs, 8 planters and a waiter station in connection with the existing ground floor restaurant.
-
26/02237/FULL Awaiting decision
11 - 12 William Street London SW1X 9HL
Minor internal works to lower floors and installation of part external goods lift. [Linked to 26/02238/LBC]
-
26/02238/LBC Awaiting decision
11 - 12 William Street London SW1X 9HL
Minor internal works to lower floors and installation of part external goods lift. [Linked to 26/02237/FULL]
-
26/02627/ADV Awaiting decision
8 - 9 William Street London SW1X 9HL
Display of internally illuminated fascia sign measuring 0.833m X 0.31m and 0.833m X 0.31m
-
25/05581/LBC Awaiting decision
81 Knightsbridge London SW1X 7RB
Alterations to shopfront, new signage and internal alterations at ground and basement levels (Linked 25/07100/NMA and 25/07101/ADV).
Other heritage and listed buildings applications
In Westminster
-
26/04984/LBC Awaiting decision
47G Randolph Avenue London W9 1BQ
Installation of replacement fire surround.
-
26/04997/LBC Awaiting decision
Hanover Lodge Outer Circle Regent's Park London NW1 4HB
Erection of a morning room side extension. (Linked to 26/04996/FULL)
-
26/04979/LBC Awaiting decision
12 Brewer Street London W1F 0SF
Internal alterations including removal of internal enclosures; Replacement flooring, shelving and slatwall systems, staircase handrail repair and other associated joinery works.
-
26/04987/LBC Awaiting decision
Basement And Ground Floor 8 Ganton Street London W1F 7QL
Repainting of the existing timber shopfront, hand-painted fascia lettering, installation of a new hanging sign using the existing projecting sign bracket, and installation of a discreet fascia-mounted LED trough light.
-
26/04995/LBC Awaiting decision
Hanover Lodge Outer Circle Regent's Park London NW1 4HB
Erection of rear conservatory extensions and an entrance loggia to side with roof terrace above, together with associated landscaping and alterations. (Linked with 26/04994/FULL)