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

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

• 25/05410/FULL 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 25/05411/LBC)

  Decided 23 Oct 2025 Full applications

1. 1 Aug 2025

   Received by Westminster

2. 29 Sep 2025

   Decision issued: Application Permitted

3. 21 Jul 2026

   Added to PlanIndex

• 25/05410/FULL 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 25/05411/LBC)

  Decided 23 Oct 2025 Full applications

1 later application on the register refers to this one:

• 25/05410/FULL 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 25/05411/LBC)

  Decided 23 Oct 2025 Full applications

Westminster granted permission on 29 September 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.

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

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

  25/05410/FULL 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 25/05411/LBC)

  Granted Full applications 21 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

• 26/04878/LBC Decided

  34 Grosvenor Street London W1K 4QU

  Internal works to facilitate the subdivision of 34 Grosvenor Street and 3 Three Kings Yard

  Received 21 Jul, published by the council 1 Aug 2026 Heritage and listed buildings
• 26/06299/LBC Awaiting decision

  Apartment 33 24 Park Crescent London W1B 1AA

  Alterations to internal partitions, door openings, doors and floor finishes.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06305/LBC Awaiting decision

  33A Dean Street London W1D 4PP

  Installation of new concrete slab with drainage channels at basement level and new fire surround in B.01.

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/06318/LBC 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 26/06317/FULL)

  Received 15 Sep, published by the council 22 Sep 2026 Heritage and listed buildings
• 26/04141/LBC Decided

  80E Randolph Avenue London W9 1BG

  Replacement of sashes in two front windows at 2nd floor level and one rear window with slimline double glazed timber sashes. (Linked with 26/04142/FULL)

  Received 23 Jun, published by the council 21 Jul 2026 Heritage and listed buildings