Planning application
25/08949/LBC
The Dilly 21 Piccadilly London W1J 0BH
Proposal
New external roof top plant and new ventilation ductwork to rear elevation. (Linked to 25/08948/FULL)
As published by the council, reference 25/08949/LBC
Timeline
Dates from the published record
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9 Dec 2025
Received by Westminster
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24 Feb 2026
Validated
Checked as complete and ready for consideration.
-
20 Jul 2026
Decision issued: Application Permitted
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29 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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25/08948/FULL Granted
The Dilly 21 Piccadilly London W1J 0BH
New external roof top plant and new ventilation ductwork to rear elevation. (Linked to 25/08949/LBC)
-
25/09142/LBC Granted
The Dilly 21 Piccadilly London W1J 0BH
Internal works to refurbish the existing ground floor entrance bar and restaurant area
-
26/00445/LBC Awaiting decision
The Dilly 21 Piccadilly London W1J 0BH
Internal refurbishment and redecoration of 283 guest rooms and corridors, floor levels 1 to 9.
-
25/08908/LBC Granted
The Dilly 21 Piccadilly London W1J 0BH
Repair works to existing plaster ceiling in hotel restaurant kitchen.
-
26/02808/LBC Awaiting decision
The Dilly 21 Piccadilly London W1J 0BH
Retrospective application for internal refurbishment of Level 2 lift lobby.
-
25/05198/FULL Granted
The Dilly 21 Piccadilly London W1J 0BH
Update of the MEP infrastructure to include internal works to refurbish the existing internal roof top plant room with new external acoustic louvres and new external roof top plant.
Other heritage and listed buildings applications
In Westminster
-
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)
-
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)