3 St James's Square London SW1Y 4JU

This site has had 3 applications since 2025: 2 approved, 0 refused.

• 26/00858/FULL Awaiting decision

  3 St James's Square London SW1Y 4JU

  Alterations to the St. James's Square facade including replacement of windows and entrances, at main roof level addition of roof pavilion extension, plant equipment and enclosures, with roof terraces at eight and ninth floor levels and a rear extension to accommodate a lift shaft and associated works.

  Submitted 12 Feb 2026 Full applications
• 25/05780/FULL Granted

  3 St James's Square London SW1Y 4JU

  Extension of lift overrun at roof level and associated works.

  Decided 2 Oct 2025 Full applications

1. 27 Nov 2025

   Received by Westminster

2. 19 Mar 2026

   Decision issued: Application Permitted

3. 20 Jul 2026

   Added to PlanIndex

Westminster granted permission on 19 March 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

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.

• 3 St James's Square London SW1Y 4JU

  26/00858/FULL Submitted 12 Feb 2026 50 yards away

  88% historically approved · decision due ~9 Apr

  Alterations to the St. James's Square facade including replacement of windows and entrances, at main roof level addition of roof pavilion extension, plant equipment and enclosures, with roof terraces at eight and ninth floor levels and a rear extension to accommodate a lift shaft and associated works.

  Awaiting decision Full applications Extension Windows or glazing 25 docs

• 3 St James's Square London SW1Y 4JU

  25/05780/FULL Submitted 15 Aug 2025 50 yards away

  Extension of lift overrun at roof level and associated works.

  Granted Full applications Extension 19 docs

• Open Space Centre Of St James's Square London SW1Y 4LD

  25/06052/TPO Submitted 25 Aug 2025 50 yards away

  T146 1 x Tree of Heaven: Crown reduce to previous, most recent reduction points, pruning back to suitable growth points and retaining shortened regrowth.

  Granted Trees 7 docs

• Charles House 5 - 11 Regent Street London SW1Y 4LR

  26/00462/FULL Submitted 27 Jan 2026 50 yards away

  88% historically approved · decision due ~24 Mar

  Replacement of a single extract fan with a new louvre on the front elevation and associated works.

  Awaiting decision Full applications 17 docs

• 7 St James's Square London SW1Y 4JU

  26/04577/ADFULL Submitted 9 Jul 2026 50 yards away

  89% historically approved · decision due ~3 Sep

  Details of annotated elevations showing the precise location of each external item; full product specifications, finishes and dimensions; sections and fixing details demonstrating how each item will be attached to the listed fabric; and confirmation of cable routes, penetrations and any making good of historic fabric pursuant to Condition 4 of planning permission dated 19 March 2026 (RN: 25/07345/FULL).

  Decided

• Basement And Ground Floor 13 Regent Street London SW1Y 4LR

  26/03462/ADV Submitted 27 May 2026 50 yards away

  82% historically approved · decision due ~22 Jul

  Display of two internally illuminated fascia signs measuring 0.35m x 1.88m and and one non-illuminated projecting signage measuring 0.5m x 0.5m.

  Awaiting decision Advertising 9 docs

• 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