Planning application
25/09401/LBC
11 - 12 St James's Square London SW1Y 4LB
Proposal
External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09400/FULL)
As published by the council, reference 25/09401/LBC
Timeline
Dates from the published record
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22 Dec 2025
Received by Westminster
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20 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
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
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25/09400/FULL Awaiting decision
11 - 12 St James's Square London SW1Y 4LB
External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)
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26/00842/FULL Awaiting decision
13 Mason's Yard London SW1Y 6BU
Installation of four condenser units at roof level.
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26/03269/LBC Awaiting decision
Chatham House 10 St James's Square London SW1Y 4LE
Removal of internal partition wall in the office spaces at the second floor.
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25/05354/LBC Granted
Chatham House 10 St James's Square London SW1Y 4LE
Remedial structural works to the lightwell and basement vault.
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25/06988/ADFULL Awaiting decision
14 St James's Square London SW1Y 4LG
Detailed drawings and manufacturers specifications of of the new lourve to lower ground floor level within the front lightwell pursuant to condition 4 of planning permssion dated 18th December 2024 (RN:24/06485/FULL). Linked to 25/07098/ADLBC
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26/01037/ADFULL Granted
14 St James's Square London SW1Y 4LG
Detailed drawings of acoustic enclosure pursuant to condition 5 of planning permission dated 18th December 2024 (RN:24/06485/FULL).
Other heritage and listed buildings applications
In Westminster
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26/04984/LBC Awaiting decision
47G Randolph Avenue London W9 1BQ
Installation of replacement fire surround.
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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)
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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.
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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.
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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)