20A Seymour Street London W1H 7HX

This site has had 2 applications since 2025.

• 25/09082/FULL Awaiting decision

  20A Seymour Street London W1H 7HX

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

  Submitted 16 Dec 2025 Full applications

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 66 days over the applications it decided in the last year.

• 25/09082/FULL Awaiting decision

  20A Seymour Street London W1H 7HX

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

  Submitted 16 Dec 2025 Full applications

1 later application on the register refers to this one:

• 25/09082/FULL Awaiting decision

  20A Seymour Street London W1H 7HX

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

  Submitted 16 Dec 2025 Full applications

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided heritage and listed building applications in a median of 94 days. More in our guide to how long planning decisions take.

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

• 20A Seymour Street London W1H 7HX

  25/09082/FULL Submitted 16 Dec 2025 50 yards away

  87% historically approved · decision due ~10 Feb

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

  Awaiting decision Full applications Windows or glazing 3 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

  90% 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

• 26/04878/LBC Decided

  34 Grosvenor Street London W1K 4QU

  Internal works to facilitate the subdivision of 34 Grosvenor Street and 3 Three Kings Yard

  Received 21 Jul, published by the council 1 Aug 2026 Heritage and listed buildings
• 26/06299/LBC Awaiting decision

  Apartment 33 24 Park Crescent London W1B 1AA

  Alterations to internal partitions, door openings, doors and floor finishes.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06305/LBC Awaiting decision

  33A Dean Street London W1D 4PP

  Installation of new concrete slab with drainage channels at basement level and new fire surround in B.01.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06318/LBC Awaiting decision

  124 Hamilton Terrace London NW8 9UT

  Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06317/FULL)

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/04141/LBC Decided

  80E Randolph Avenue London W9 1BG

  Replacement of sashes in two front windows at 2nd floor level and one rear window with slimline double glazed timber sashes. (Linked with 26/04142/FULL)

  Received 23 Jun, published by the council 21 Jul 2026 Heritage and listed buildings