11 - 12 St James's Square London SW1Y 4LB

This site has had 2 applications since 2025.

• 25/09400/FULL Awaiting decision

  11 - 12 St James's Square London SW1Y 4LB

  External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)

  Submitted 22 Dec 2025 Full applications

1. 22 Dec 2025

   Received by Westminster

2. 20 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 16 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.

• 25/09400/FULL Awaiting decision

  11 - 12 St James's Square London SW1Y 4LB

  External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)

  Submitted 22 Dec 2025 Full applications

1 later application on the register refers to this one:

• 25/09400/FULL Awaiting decision

  11 - 12 St James's Square London SW1Y 4LB

  External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)

  Submitted 22 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.

• 11 - 12 St James's Square London SW1Y 4LB

  25/09400/FULL Submitted 22 Dec 2025 50 yards away

  87% historically approved · decision due ~16 Feb

  External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)

  Awaiting decision Full applications Extension 128 docs

• Flat 19 Bray House Duke Of York Street London SW1Y 6JX

  25/08598/FULL Submitted 25 Nov 2025 50 yards away

  Replacement of single glazed steel crittall windows with double glazed windows.

  Granted Full applications Windows or glazing 20 docs

• Flat 11 Bray House Duke Of York Street London SW1Y 6JX

  26/05463/FULL Submitted 11 Aug 2026 50 yards away

  87% historically approved · decision due ~20 Oct

  Installation of replacement windows to the third floor rear and side elevations.

  Awaiting decision Full applications Windows or glazing

• Flat 6 Bray House Duke Of York Street London SW1Y 6JX

  26/05843/FULL Submitted 25 Aug 2026 50 yards away

  87% historically approved · decision due ~20 Oct

  Installation of replacement windows to the second floor front elevation.

  Awaiting decision Full applications Windows or glazing 17 docs

• 13 Mason's Yard London SW1Y 6BU

  26/00842/FULL Submitted 11 Feb 2026 50 yards away

  87% historically approved · decision due ~5 Jun

  Installation of four condenser units at roof level.

  Awaiting decision Full applications 13 docs

• 3 Ormond Yard London SW1Y 6JT

  20/07962/ADFULL Submitted 14 Dec 2020 50 yards away

  Details of the colours and finishes of the roof and walls of the extension; section profiles of frames and transoms of the new doors, as well as their colour and finish; the treatment of the verge of the extension, including its material, colour and finish; pursuant to condition 3 of planning permission granted at appeal dated 26 October 2020 (RN: 19/00825/HASREF).

  Granted Full applications Extension 8 docs

• 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