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

This site has had 2 applications since 2025.

• 25/09401/LBC 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 25/09400/FULL)

  Submitted 22 Dec 2025 Heritage and listed buildings

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.

• 25/09401/LBC 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 25/09400/FULL)

  Submitted 22 Dec 2025 Heritage and listed buildings

1 later application on the register refers to this one:

• 25/09401/LBC 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 25/09400/FULL)

  Submitted 22 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 91 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.

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

  25/09401/LBC Submitted 22 Dec 2025 50 yards away

  90% 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 25/09400/FULL)

  Awaiting decision Heritage and listed buildings Extension 92 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

• 26/06295/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Installation of a new shopfront with Medication Dispensing Outlet.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06297/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Alterations to rear elevation at basement level comprising replacement window and installation of double opening door.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06294/FULL Awaiting decision

  15 Eaton Mews South London SW1W 9HP

  Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06317/FULL 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 26/06318/LBC)

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06273/FULL Awaiting decision

  9A Grosvenor Square London W1K 5AE

  Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

  Received 14 Sep, published by the council 22 Sep 2026 Full applications