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Planning application

25/09082/FULL

20A Seymour Street London W1H 7HX

Awaiting decision Westminster Full Planning Permission Application

Proposal

Installation of replacement sash windows and a replacement skylight within a smaller opening. [Linked with 25/09083/LBC].

As published by the council, reference 25/09082/FULL

Timeline

Dates from the published record

  1. 16 Dec 2025

    Received by Westminster

  2. 20 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.

What happens while it is decided

The process from here

This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

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

  • 25/09083/LBC Awaiting decision

    20A Seymour Street London W1H 7HX

    Installation of replacement sash windows and a replacement skylight within a smaller opening. [Linked with 25/09082/FULL]

    16 Dec 2025 0m away Heritage and listed buildings
  • 25/05696/LBC Granted

    Flat 3 20A Seymour Street London W1H 7HX

    Layout changes including increasing size of bedroom, relocate bathroom door to create an en-suite, increase size of kitchen and divide box room to the lower floor to create a guest WC and Utility room.

    13 Aug 2025 2m away Heritage and listed buildings
  • 25/07016/LBC Awaiting decision

    1 New Quebec Street London W1H 7DD

    Installation of secondary glazing, installation of kitchenette to ground floor, waterproofing works to underpavement vault.

    30 Sep 2025 8m away Heritage and listed buildings
  • 25/06157/LBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Repair strategy for the preservation of existing ceilings

    29 Aug 2025 9m away Heritage and listed buildings
  • 26/03007/ADLBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Details of the repairs and upgrading of the rear oriel window pursuant to condition 5 of listed building consent dated 8th August 2023 (RN:23/02367).

    7 May 2026 9m away Conditions
  • 26/01286/ADLBC Awaiting decision

    18 Seymour Street London W1H 7HU

    Details of vaults waterproofing method pursuant to Condition 7 of listed building consent dated 8 August 2023 (RN: 23/02367/LBC)

    2 Mar 2026 9m away Conditions

In Westminster

  • 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).

    20 Jul 2026 Full applications
  • 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)

    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