3A Devonshire Mews South London W1G 6QW

1. 8 Sep 2026

   Received by Westminster

2. 22 Sep 2026

   Validated

   Checked as complete and ready for consideration.

3. 23 Sep 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 17 November 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 86 days over the applications it decided in the last year.

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.

• 6 Upper Wimpole Street London W1G 6LG

  26/03644/LBC Submitted 4 Jun 2026 50 yards away

  90% historically approved · decision due ~30 Jul

  Installation of an automatic fire suppression (sprinkler) system.

  Awaiting decision Heritage and listed buildings 12 docs

• 9 Upper Wimpole Street London W1G 6LJ

  11/05045/FULL Submitted 26 May 2011 50 yards away

  Use of lower ground floor level for medical purposes (Class D1), installation of air conditioning unit in rear lower ground floor courtyard and one under the front lightwell staircase.

  Granted Full applications 15 docs

• 9 Upper Wimpole Street London W1G 6LJ

  11/05046/LBC Submitted 26 May 2011 50 yards away

  Use of lower ground floor level for medical purposes (Class D1) in association with internal alterations and the installation of air conditioning unit in rear lower ground floor courtyard. (part of land use swap with 122 Harley Street, 134 Harley Street, 40 Harley Street and 52 Harley Street).

  Granted Heritage and listed buildings 3 docs

• 9 Upper Wimpole Street London W1G 6LJ

  11/00772/LBC Submitted 27 Jan 2011 50 yards away

  Internal alterations at lower ground floor

  Withdrawn Heritage and listed buildings 3 docs

• 9 Upper Wimpole Street London W1G 6LJ

  13/01665/AD7 Submitted 22 Feb 2013 50 yards away

  Display for a temporary period of six months of a non illuminated 'to let' board attached to the railings at the front of the building at street level and measuring 0.6m x 0.45m.

  Granted Advertising 2 docs

• 99C Devonshire Mews South London W1G 6QR

  17/03334/LBC Submitted 18 Apr 2017 50 yards away

  Replacement windows at third floor level and internal alterations.

  Granted Heritage and listed buildings Windows or glazing 19 docs

• 26/05984/FULL Decided

  41 Sutherland Street London SW1V 4JX

  Replacement of front, side and rear windows with double glazed timber framed sash windows and replacement of a door with a double glazed timber framed door.

  Received 2 Sep, published by the council 11 Sep 2026 Full applications
• 26/06134/FULL Decided

  Flat 10H Hyde Park Mansions Cabbell Street London NW1 5BG

  Replacement of front and rear second floor level windows with slim-profile double-glazed panels, retaining the existing window and door frames.

  Received 8 Sep, published by the council 15 Sep 2026 Full applications
• 26/07258/FULL Awaiting decision

  16A Croxley Road London W9 3HL

  Installation of air to air heat pumps to offices and bedrooms.

  Received 22 Oct, published by the council 23 Oct 2026 Full applications
• 26/07193/FULL Awaiting decision

  98 Victoria Street London SW1E 5JL

  Shopfront alterations. (Linked with 26/07194/ADV)

  Received 21 Oct, published by the council 22 Oct 2026 Full applications
• 26/07187/FULL Awaiting decision

  Ground Floor Flat 151 Portnall Road London W9 3BN

  Erection of a single storey rear extension.

  Received 21 Oct, published by the council 22 Oct 2026 Full applications