Basement And Ground Floor 12 Mount Street London W1K 2RD

This site has had 2 applications since 2026.

• 26/00991/LBC Awaiting decision

  Basement And Ground Floor 12 Mount Street London W1K 2RD

  Retrospective consent for the installation of an external condenser unit at lower ground floor level in the front lightwell and internal alterations at lower ground floor level. [Linked to 26/00990/FULL]

  Submitted 17 Feb 2026 Heritage and listed buildings

1. 17 Feb 2026

   Received by Westminster

2. 21 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 14 April 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.

• 26/00991/LBC Awaiting decision

  Basement And Ground Floor 12 Mount Street London W1K 2RD

  Retrospective consent for the installation of an external condenser unit at lower ground floor level in the front lightwell and internal alterations at lower ground floor level. [Linked to 26/00990/FULL]

  Submitted 17 Feb 2026 Heritage and listed buildings

1 later application on the register refers to this one:

• 26/00991/LBC Awaiting decision

  Basement And Ground Floor 12 Mount Street London W1K 2RD

  Retrospective consent for the installation of an external condenser unit at lower ground floor level in the front lightwell and internal alterations at lower ground floor level. [Linked to 26/00990/FULL]

  Submitted 17 Feb 2026 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.

• Basement And Ground Floor 12 Mount Street London W1K 2RD

  26/00991/LBC Submitted 17 Feb 2026 50 yards away

  90% historically approved · decision due ~14 Apr

  Retrospective consent for the installation of an external condenser unit at lower ground floor level in the front lightwell and internal alterations at lower ground floor level. [Linked to 26/00990/FULL]

  Awaiting decision Heritage and listed buildings 8 docs

• 11 Mount Street London W1K 2RB

  26/01651/LBC Submitted 13 Mar 2026 50 yards away

  90% historically approved · decision due ~10 Jun

  Installation of automatic opening fire vent at top floor of 11 Mount Street accommodation and fire exit stair core to residential apartments which occupy 1st floor to roof level. [Linked to 26/01869/FULL]

  Awaiting decision Heritage and listed buildings New dwelling 16 docs

• 11 Mount Street London W1K 2RB

  26/01869/FULL Submitted 23 Mar 2026 50 yards away

  88% historically approved · decision due ~10 Jun

  Installation of automatic opening fire vent at top floor of 11 Mount Street accommodation and fire exit stair core to residential apartments which occupy 1st floor to roof level. [Linked to 26/01651/LBC]

  Awaiting decision Full applications New dwelling 16 docs

• Flat 1 11 Mount Street London W1K 2RB

  12/05083/LBC Submitted 11 May 2012 50 yards away

  Internal alterations at first floor level

  Granted Heritage and listed buildings 4 docs

• Connaught Hotel Carlos Place London W1K 2AL

  20/07842/ADV Submitted 8 Dec 2020 50 yards away

  Display of one non-illuminated fascia sign measuring 0.3m x 1.5m for a temporary period between 01 December 2020 and 04 January 2021. Linked to 20/07630/FULL

  Decided Advertising 10 docs

• 14 Mount Street London W1K 2RF

  25/06838/FULL Submitted 24 Sep 2025 50 yards away

  Installation of a small wall mounted air conditioning unit located on exterior wall within an enclosed lightwell at first floor level to 14-16 Mount Street. Linked with 25/06839/LBC

  Withdrawn Full applications 10 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