25 Upper Montagu Street London W1H 1SA

This site has had 2 applications since 2025.

• 25/08299/LBC Awaiting decision

  25 Upper Montagu Street London W1H 1SA

  Replacement of existing external staircase within front lightwell. (Linked to 25/07358/FULL)

  Submitted 11 Nov 2025 Heritage and listed buildings

1. 10 Oct 2025

   Received by Westminster

2. 11 Nov 2025

   Validated

   Checked as complete and ready for consideration.

3. 21 Jul 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 6 January 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.

• 25/08299/LBC Awaiting decision

  25 Upper Montagu Street London W1H 1SA

  Replacement of existing external staircase within front lightwell. (Linked to 25/07358/FULL)

  Submitted 11 Nov 2025 Heritage and listed buildings

1 later application on the register refers to this one:

• 25/08299/LBC Awaiting decision

  25 Upper Montagu Street London W1H 1SA

  Replacement of existing external staircase within front lightwell. (Linked to 25/07358/FULL)

  Submitted 11 Nov 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.

• 25 Upper Montagu Street London W1H 1SA

  25/08299/LBC Submitted 11 Nov 2025 50 yards away

  90% historically approved · decision due ~6 Jan

  Replacement of existing external staircase within front lightwell. (Linked to 25/07358/FULL)

  Awaiting decision Heritage and listed buildings 7 docs

• 26 Upper Montagu Street London W1H 1RP

  26/03214/FULL Submitted 15 May 2026 50 yards away

  88% historically approved · decision due ~10 Jul

  Erection of a one and a half storey rear extension tp enlarge HMO, installation of replacement windows and installation of balcony railings.

  Awaiting decision Full applications Extension Windows or glazing 12 docs

• 26 Upper Montagu Street London W1H 1RP

  25/08746/FULL Submitted 1 Dec 2025 50 yards away

  88% historically approved · decision due ~26 Jan

  Erection of a two storey rear extension and internal reconfiguration of HMO.

  Awaiting decision Full applications Extension 18 docs

• 21 Upper Montagu Street London W1H 2PQ

  25/08056/LBC Submitted 5 Nov 2025 50 yards away

  Replacement of existing non-original single-glazed timber sash windows with new slimline double-glazed timber sash windows to match the original in appearance, detailing and materials. (Linked to 25/08055/FULL)

  Granted Heritage and listed buildings Windows or glazing 18 docs

• 21 Upper Montagu Street London W1H 2PQ

  25/08055/FULL Submitted 5 Nov 2025 50 yards away

  Replacement of single-glazed timber sash windows with slimline double-glazed timber sash windows to match the original in appearance, detailing and materials. (Linked to 25/08056/LBC)

  Granted Full applications Windows or glazing 12 docs

• 21 Upper Montagu Street London W1H 2PQ

  25/06220/FULL Submitted 2 Sep 2025 50 yards away

  Careful dismantling and rebuilding of bowed flank elevation in matching/reused brickwork and replacement of existing timber joists to third floor. (Linked with 25/06221/LBC)

  Withdrawn Full applications 20 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