Third Floor And Fourth Floor Rear 128 Mount Street London W1K 3NU

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

• 25/05411/LBC Granted

  Third Floor And Fourth Floor Rear 128 Mount Street London W1K 3NU

  Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail (Linked 25/05410/FULL)

  Decided 29 Sep 2025 Heritage and listed buildings

1. 1 Aug 2025

   Received by Westminster

2. 23 Oct 2025

   Decision issued: Application Permitted

3. 21 Jul 2026

   Added to PlanIndex

• 25/05411/LBC Granted

  Third Floor And Fourth Floor Rear 128 Mount Street London W1K 3NU

  Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail (Linked 25/05410/FULL)

  Decided 29 Sep 2025 Heritage and listed buildings

1 later application on the register refers to this one:

• 25/05411/LBC Granted

  Third Floor And Fourth Floor Rear 128 Mount Street London W1K 3NU

  Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail (Linked 25/05410/FULL)

  Decided 29 Sep 2025 Heritage and listed buildings

Westminster granted permission on 23 October 2025, 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.

• Third Floor And Fourth Floor Rear 128 Mount Street London W1K 3NU

  25/05411/LBC Submitted 1 Aug 2025 50 yards away

  Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail (Linked 25/05410/FULL)

  Granted Heritage and listed buildings 20 docs

• 128 Mount Street London W1K 3NU

  25/04553/ADFULL Submitted 2 Jul 2025 50 yards away

  Details of waste and recycling storage pursuant to Condition 7 of planning permission dated 7th January 2025 (RN: 24/06686/FULL)

  Granted Full applications 9 docs

• 35 Berkeley Square London W1J 5BF

  25/07217/LBC Submitted 6 Oct 2025 50 yards away

  Installation of new office partitions to rear wing at ground floor level, and replacement of front step overcladding. General internal refit, reservicing and redecoration.

  Granted Heritage and listed buildings 52 docs

• 34 Berkeley Square London W1J 5BF

  26/03168/LBC Submitted 13 May 2026 50 yards away

  90% historically approved · decision due ~8 Jul

  To create openings in, and remove walls on the fourth floor to improve the efficiency of the office space.

  Awaiting decision Heritage and listed buildings 8 docs

• 34 Berkeley Square London W1J 5BF

  22/03792/FULL Submitted 10 Jun 2022 50 yards away

  Various external works to include hand-rail, emergency lights, grating and opaque window film.

  Granted Full applications Windows or glazing 15 docs

• 125 Mount Street London W1K 3NS

  10/08112/FULL Submitted 22 Sep 2010 50 yards away

  Installation of plant equipment at rear basement level and alterations to shopfront.

  Granted Full applications Windows or glazing 12 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