Planning application
25/08684/LBC
Third Floor Mappin House 4 Winsley Street London W1W 8HF
Proposal
Removal and replacement of air conditioning units at roof level, and internal alterations to office space at third floor level. (Linked with 25/08683/FULL)
As published by the council, reference 25/08684/LBC
Timeline
Dates from the published record
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27 Nov 2025
Received by Westminster
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2 Apr 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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25/08683/FULL Granted
Third Floor Mappin House 4 Winsley Street London W1W 8HF
Removal and replacement of air conditioning units at roof level. (Linked with 25/08684/LBC)
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26/01191/LBC Awaiting decision
158 Oxford Street London W1D 1LZ
Installation of 11 metres of fibre telecommunications cable from a fibre termination box in the basement telecoms room, to a communications cabinet located in the ground floor managers office.
-
26/02551/LBC Awaiting decision
Ground Floor 156 Oxford Street London W1D 1ND
Retrospective consent for the replacement of non-original pavement lights and associated structural repairs and below ground waterproofing remedial works.
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25/05048/FULL Awaiting decision
50 Eastcastle Street London W1W 8EA
Variation of Condition 1 of planning permission dated 7th February 2024 (RN:23/08597/FULL) for: Alterations to front entrance including replacement canopy; replacement of existing secondary doors and roller shutter to rear entrance; signage and other associated works namely; alterations to front entrance including replacement canopy; replacement of existing secondary doors and roller shutter to rear entrance; signage and other associated works.
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26/02248/ADV Awaiting decision
50 Eastcastle Street London W1W 8EA
Display of two externally illuminated fascia signs measuring 0.375m x 0.575, 0.17m x 0.28m, one non illuminated fasica sign measuring 0.48m x 0.87m and two non illuminated projecting sins measuring 0.5m x 0.783m, 0.3m x 0.385m.
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26/02134/FULL Awaiting decision
50 Eastcastle Street London W1W 8EA
Installation of three new dry riser inlets to serve Princess House, 50-60 Eastcastle Street, as part of a wider fire safety enhancement strategy.
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.
-
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.
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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)