Planning application
25/08750/FULL
3 Wilton Street London SW1X 7AF
Proposal
Erection of a mansard roof extension.
As published by the council, reference 25/08750/FULL
Timeline
Dates from the published record
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1 Dec 2025
Received by Westminster
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17 Apr 2026
Decision issued: Application Refused
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1 Aug 2026
Added to PlanIndex
What refusal means
The process from here
The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.
Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.
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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25/08751/LBC Refused
3 Wilton Street London SW1X 7AF
Erection of a mansard roof extension and internal alterations to third floor level.
-
25/05488/LBC Granted
3 Wilton Street London SW1X 7AF
Alterations to basement and ground floors including conversion of lounge to a bedroom and dressing room and other internal alterations.
-
25/06550/FULL Refused
3 Wilton Street London SW1X 7AF
Installation of security bars to front windows of basement and ground floors.
-
25/06551/LBC Refused
3 Wilton Street London SW1X 7AF
Installation of security bars to front windows of basement and ground floors.
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26/01240/LBC Awaiting decision
6 Wilton Street London SW1X 7AF
Partial demolition at rear basement, ground and closet wing; extension at rear basement & ground floor with terrace and lantern rooflight over; rebuilding of closet wing with additional storey; replacement windows at rear; internal alterations. (Linked to 26/01239/FULL)
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26/01274/LBC Awaiting decision
6 Wilton Street London SW1X 7AF
Removal of existing roof and rear third floor mansard and replacement with fourth floor mansard extension; replacement of front third floor windows and new rear third floor windows; internal alterations. [Linked to 26/01273/FULL]
Other full applications applications
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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).
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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.