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 66 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 91 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

  87% 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

• 26/06295/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