21 Montagu Street London W1H 7EX

1. 4 Dec 2025

   Received by Westminster

2. 24 Apr 2026

   Validated

   Checked as complete and ready for consideration.

3. 8 Jun 2026

   Decision issued: Application Permitted

4. 29 Jul 2026

   Added to PlanIndex

Westminster granted permission on 8 June 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.

• 22 Montagu Street London W1H 7EZ

  11/05323/FULL Submitted 3 Jun 2011 50 yards away

  Installation of replacement windows on front facade.

  Granted Full applications Windows or glazing 7 docs

• 22 Montagu Mews South London W1H 7ES

  04/09799/CAC Submitted 10 Dec 2004 50 yards away

  Demolition of roof, part rear elevation, internal partitions and floors.

  Granted Heritage and listed buildings Demolition 2 docs

• 22 Montagu Mews South London W1H 7ES

  04/09798/FULL Submitted 10 Dec 2004 50 yards away

  Demolition of roof and replacement with extended roof and infill of rear lightwell.

  Granted Full applications Extension Demolition 9 docs

• 19 Montagu Street London W1H 7EX

  26/07053/TCA Submitted 15 Oct 2026 50 yards away

  100% historically approved · decision due ~10 Dec

  (T1) - Cherry(Prunus) -reduce crown by 25%(2.5m max) to suitable growth points -prune lateral branches to match, shape and tidy -crown lift removing 3x lowest branches back to main trunk collar All works are for routine maintenance.

  Awaiting decision Trees

• 26 Montagu Mews South London W1H 7ES

  25/05187/FULL Submitted 25 Jul 2025 50 yards away

  Replacement of garage doors with timber windows.

  Granted Full applications Windows or glazing 14 docs

• 9 Upper Berkeley Street London W1H 7QA

  26/03305/FULL Submitted 19 May 2026 50 yards away

  88% historically approved · decision due ~14 Jul

  Installation of a new boosted cold water system within the existing basement vault area, including replacement of the existing vault door with a painted timber louvred door to match existing.

  Awaiting decision Full applications 7 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