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Planning application

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

Granted Westminster 25/05410/FULL Full Planning Permission Application

Relates to 25/05411/LBC

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Replacement of existing access hatch, ladder and internal loft with an Automatic Opening Vent with retractable ladder and integrated handrail (Linked 25/05411/LBC)

As published by the council, reference 25/05410/FULL

Application record

Reference
25/05410/FULL
Type
Full Planning Permission Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
1 Aug 2025
Validated
1 Aug 2025
Decided
23 Oct 2025
Ward
West End
Decision by
Delegated Decision
Postcode
W1K 3NU

Site history

Applications at this address on the Westminster register

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

Timeline

Dates from the published record

  1. 1 Aug 2025

    Received by Westminster

  2. 23 Oct 2025

    Decision issued: Application Permitted

  3. 21 Jul 2026

    Added to PlanIndex

Cases linked to this one on the register

  • 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

Who's behind it

Company information only, from the register and Companies House

Newmark LLP Agent

921 applications on PlanIndex · across 40 councils · 97% granted

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Documents

Plans, drawings, consultee responses and the officer's report

21 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

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Open the documents

What this grant of permission means

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.

About full applications

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.

Nearby applications

Within 0.3 miles

  • 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

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront with Medication Dispensing Outlet.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06297/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Alterations to rear elevation at basement level comprising replacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06294/FULL Awaiting decision

    15 Eaton Mews South London SW1W 9HP

    Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06317/FULL 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 26/06318/LBC)

    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06273/FULL Awaiting decision

    9A Grosvenor Square London W1K 5AE

    Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

    Received 14 Sep, published by the council 22 Sep 2026 Full applications