Planning application
25/06935/FULL
17 Belgrave Square London SW1X 8PG
Proposal
Part refurbishment, part replacement, of the existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at 17 Belgrave Mews West. (Linked with 25/06936/LBC)
As published by the council, reference 25/06935/FULL
Timeline
Dates from the published record
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26 Sep 2025
Received by Westminster
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22 Oct 2025
Validated
Checked as complete and ready for consideration.
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18 Mar 2026
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.
Nearby applications
Within 500 metres
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25/06936/LBC Granted
17 Belgrave Square London SW1X 8PG
Part refurbishment, part replacement, of the existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at 17 Belgrave Mews West. (Linked with 25/06935/FULL)
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26/03541/ADLBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawing of floor build-up of the underfloor heating system; pursuant to condition 12 of Listed building consent dated 30th May 2025 (RN 25/02106/LBC)
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26/03054/FULL Awaiting decision
17 Belgrave Square London SW1X 8PG
Reconfiguration and alteration of the area between the main building and the Mews, including the erection of a pergola structure, alterations to the rear annex openings, updated rear garden layout.
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26/03051/LBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Removal of Condition 10 of listed building consent dated 18th August 2025 (RN:25/03417/LBC) for: Replacement and erection of five air condenser units within acoustic enclosure on main roof of 17 Belgrave Square, two new air condenser units within two separate enclosures on rear ground floor terrace to 17 Belgrave Mews West and internal air conditioning units. Internal and external alterations, including alteration to conservatory, internal layout changes, installation of underfloor heating system, and removal and replacement of floorboards, doors and MEP services namely, to remove the requirement to carry out a paint analysis of the principal rooms.
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26/01147/LBC Awaiting decision
18 Belgrave Mews West London SW1X 8PX
Repainting and stucco render repair to front façade of 18 Belgrave Square, installation of replacement EWI render system of rear elevation (18 Belgrave Mews West) and courtyard facing elevations, replacement of external venetian blinds and installation of powder coated aluminium over cills to existing concrete cills (site includes 18 Belgrave Mews)
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26/00605/TPO Awaiting decision
Open Space Belgrave Square London SW1X 8PS
T4477 - Laburnum anagyroides: Remove faulted stem(s) - declining, bark damaged stem with dead top, to prevent continued decline causing instability and failure onto the garden footpath. See images.
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).
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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.