20A Seymour Street London W1H 7HX

This site has had 2 applications since 2025.

• 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]

  Submitted 16 Dec 2025 Heritage and listed buildings

1. 16 Dec 2025

   Received by Westminster

2. 20 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 10 February 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Westminster took a median of 91 days over the applications it decided in the last year.

• 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]

  Submitted 16 Dec 2025 Heritage and listed buildings

1 later application on the register refers to this one:

• 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]

  Submitted 16 Dec 2025 Heritage and listed buildings

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 119 days. More in our guide to how long planning decisions take.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• 20A Seymour Street London W1H 7HX

  25/09083/LBC Submitted 16 Dec 2025 50 yards away

  90% historically approved · decision due ~10 Feb

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

  Awaiting decision Heritage and listed buildings Windows or glazing 4 docs

• Flat 3 20A Seymour Street London W1H 7HX

  25/05696/LBC Submitted 13 Aug 2025 50 yards away

  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.

  Granted Heritage and listed buildings 15 docs

• 1 New Quebec Street London W1H 7DD

  25/07016/LBC Submitted 30 Sep 2025 50 yards away

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

  Granted Heritage and listed buildings Windows or glazing 27 docs

• 18 Seymour Street London W1H 7HU

  25/06157/LBC Submitted 29 Aug 2025 50 yards away

  90% historically approved · decision due ~24 Oct

  Repair strategy for the preservation of existing ceilings

  Awaiting decision Heritage and listed buildings 17 docs

• 18 Seymour Street London W1H 7HU

  26/03007/ADLBC Submitted 7 May 2026 50 yards away

  89% historically approved · decision due ~2 Jul

  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).

  Awaiting decision Conditions Windows or glazing 10 docs

• 18 Seymour Street London W1H 7HU

  26/05164/ADLBC Submitted 30 Jul 2026 50 yards away

  89% historically approved · decision due ~24 Sep

  Details of new vault doors pursuant to condition 3 of listed building consent dated 01 April 2026 (RN: 26/01486/LBC)

  Decided

• 26/07528/FULL Awaiting decision

  69 Eaton Place London SW1X 8DF

  Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

  Received 5 Nov, published by the council 6 Nov 2026 Full applications
• 26/05200/FULL Decided

  1 The Court House 165 Seymour Place London W1H 4PU

  Installation of waterproofing system to the existing lead flat roofs

  Received 3 Aug, published by the council 28 Aug 2026 Full applications
• 26/07521/FULL Awaiting decision

  Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

  Installation of one external condenser unit

  Received 4 Nov, published by the council 6 Nov 2026 Full applications
• 26/07508/FULL Awaiting decision

  Buckingham Palace The Mall London SW1A 1AA

  Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

  Received 4 Nov, published by the council 5 Nov 2026 Full applications
• 26/07472/FULL Awaiting decision

  Flat 3 82 New Cavendish Street London W1G 9TA

  Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

  Received 3 Nov, published by the council 6 Nov 2026 Full applications