Planning application
25/08683/FULL
Third Floor Mappin House 4 Winsley Street London W1W 8HF
Proposal
Removal and replacement of air conditioning units at roof level. (Linked with 25/08684/LBC)
As published by the council, reference 25/08683/FULL
Timeline
Dates from the published record
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27 Nov 2025
Received by Westminster
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7 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 full applications applications
How this application type works
A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.
Nearby applications
Within 500 metres
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25/08684/LBC Granted
Third Floor Mappin House 4 Winsley Street London W1W 8HF
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)
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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 full applications applications
In Westminster
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26/04824/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Detailed design and specification of new blinds to NZH based on mock-up trials on-site. pursuant to condition 32 (i) of planning permission dated 8th April 2024 (23/00571/FULL).
-
26/04829/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
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26/04841/ADFULL Granted
29 Henstridge Place London NW8 6QD
Details of the facing materials you will use, including glazing, and elevations and roof plans annotated to show where the materials are to be located pursuant to condition 5 of planning permission dated 18th November 2025 (RN:25/06159).
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26/04989/FULL Awaiting decision
1 Kildare Terrace London W2 5JT
Erection of a mansard roof extending over the main house and side wing, replacement lower ground rear extension with roof terrace above, lowering of lower ground floor slab, installation of an air source heat pump in rear garden, new front boundary treatment, and new second floor window on the north elevation.
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26/04986/FULL Awaiting decision
Inver Court Inverness Terrace London W2 6JB
Replacement of combustible materials in the render facades; timber decking and plastic soffits/ fascias to terraces with non-combustible materials on the 5th and 6th floors.