Planning application
25/09169/LBC
Smithson Tower 25 St James's Street London SW1A 1HA
Proposal
Installation of new external ductwork and associated external alterations to fifth floor roof level including replacement roof membranes, access hatch and installation of a maintenance-only door to existing roof plant enclosure.
As published by the council, reference 25/09169/LBC
Timeline
Dates from the published record
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18 Dec 2025
Received by Westminster
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26 Mar 2026
Decision issued: Application Permitted
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20 Jul 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
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26/01780/LBC Awaiting decision
Denham Building 27 St James's Street London SW1A 1HA
Creation of new landscaping including the installation of new planting, external lighting, street furniture and replacement entrance to the Bank Building fronting the Smithson Plaza. (Linked with 26/01779/FULL)
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26/01779/FULL Awaiting decision
Denham Building 27 St James's Street London SW1A 1HA
Creation of new landscaping including the installation of new planting, external lighting, street furniture and replacement entrance to the Bank Building fronting the Smithson Plaza. (Linked with 26/01780/LBC)
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25/06882/LBC Awaiting decision
Basement And Ground Floor Smithson Tower 25 St James's Street London SW1A 1HA
Installation of a fascia sign, a wall plaque and 8 vinyl logos behind glazing. (Linked with 25/06931/ADV)
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25/06931/ADV Granted
Basement And Ground Floor Smithson Tower 25 St James's Street London SW1A 1HA
Display of non-illuminated fascia sign measuring 0.63m x 0.22m; and wall plaque sign measuring 0.28m x 0.45m.
-
26/00095/LBC Granted
Smithson Tower 25 St James's Street London SW1A 1HA
Installation of 120 metres of fibre telecommunications cable from the 13th floor communications room to the basement intake room.
-
25/09168/FULL Granted
Smithson Tower 25 St James's Street London SW1A 1HA
Installation of new external ductwork and associated external alterations to fifth floor roof level including replacement roof membranes, access hatch and installation of a maintenance-only door to existing roof plant enclosure.
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.
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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)