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Planning application

25/05476/FULL

9 Seymour Mews London W1H 6BE

Granted Westminster Full Planning Permission Application

Proposal

Replacement of existing single glazed timber windows with new double glazed windows.

As published by the council, reference 25/05476/FULL

Timeline

Dates from the published record

  1. 5 Aug 2025

    Received by Westminster

  2. 30 Sep 2025

    Decision issued: Application Permitted

  3. 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.

More on full applications applications in our guide

Nearby applications

Within 500 metres

  • 06/00799/CAC Granted

    11 Seymour Mews London W1H 6BE

    Substantial demolition behind retained facades.

    2 Feb 2006 4m away Heritage and listed buildings
  • 06/00798/FULL Granted

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    i) External alterations in connection with use of No. 11 as a 2x bedroom house.ii) Demolition behind retained facade of Nos. 15 and 16 to be used for office purposes. (Part of a use swap with 18 and 20 Seymour Place)

    2 Feb 2006 4m away Full applications
  • 25/04662/ADFULL Granted

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    Details of Code of Construction Practice pursuant to Condition 3 of planning permission dated 05 September 2024 (RN24/02777/FULL)

    7 Jul 2025 4m away Full applications
  • 05/09325/CAC Withdrawn

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    15 Nov 2005 4m away Heritage and listed buildings
  • 05/08944/FULL Withdrawn

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    External alterations to 11, 15 and 16 Seymour Mews to provide residential (1x2 bed maisonette) and office (Class B1) accommodation.

    2 Nov 2005 4m away Full applications
  • 25/09319/NMA Granted

    6 Seymour Mews London W1H 6BE

    Amendments to planning permission dated 5th September 2024 (RN: 24/02777/FULL) for External alterations, extension at ground floor, excavation to provide new basement, and the installation of an air source heat pump; all to enlarge and alter dwellinghouse (Class C3) namely; to alter the colours of the front ground floor facade elements (the main entrance door, garage door, windows, and rendered lintel).

    23 Dec 2025 11m away Amendments

In Westminster

  • 26/04824/ADFULL Granted

    New Zealand House 80 Haymarket London SW1Y 4TE

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    20 Jul 2026 Full applications
  • 26/04829/ADFULL Granted

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    20 Jul 2026 Full applications
  • 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).

    20 Jul 2026 Full applications
  • 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.

    24 Jul 2026 Full applications
  • 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.

    24 Jul 2026 Full applications