Planning application
25/06486/FULL
Windsor House 40 - 41 Great Castle Street London W1W 8LU
Proposal
Installation of new plant on flat roofs at rear first, third and fourth floor levels.
As published by the council, reference 25/06486/FULL
Timeline
Dates from the published record
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11 Sep 2025
Received by Westminster
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30 Oct 2025
Decision issued: Application Permitted
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21 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.
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26/08979/TCH Granted
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25/05878/LBC Awaiting decision
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External changes to the building including installation of mechanical plant at roof level, demolition and replacement of ground floor revolving entry door with a new door set, glazing of 2 windows to be replaced with louvres, modification to the roof terrace arrangement, new signage and internal alterationsl. (Linked to 25/05877/FULL)
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25/05877/FULL Awaiting decision
1 Great Portland Street London W1W 8PZ
External changes to the building including installation of mechanical plant at roof level, demolition and replacement of ground floor revolving entry door with a new door set, glazing of 2 windows to be replaced with louvres, modification to the roof terrace arrangement, new signage and internal alterations. (Linked to 25/05878/LBC)
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25/05879/ADV Granted
1 Great Portland Street London W1W 8PZ
Display of a backlit fascia sign measuring 0.13m x 0.5m.
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26/04829/ADFULL Granted
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26/04841/ADFULL Granted
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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
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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
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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.