15 Chesham Mews London SW1X 8HS

1. 22 Sep 2026

   Received by Westminster

2. 30 Sep 2026

   Validated

   Checked as complete and ready for consideration.

3. 2 Oct 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 25 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.

• 20 Chesham Mews London SW1X 8HS

  25/08508/ADFULL Submitted 20 Nov 2025 50 yards away

  Details of new glazing bars and mouldings pursuant to condition 5 of planning permission dated 30 May 2025 (RN: 25/01883/FULL)

  Refused Full applications Windows or glazing 3 docs

• 11 - 12 Chesham Place London SW1X 8HN

  25/08627/FULL Submitted 25 Nov 2025 50 yards away

  Replacement of carrara marble treads and risers to front steps to match existing.

  Granted Full applications 20 docs

• 11 - 12 Chesham Place London SW1X 8HN

  25/08628/LBC Submitted 25 Nov 2025 50 yards away

  Replacement of carrara marble treads and risers to front steps to match existing.

  Granted Heritage and listed buildings 15 docs

• 4A Belgrave Mews West London SW1X 8HT

  25/05632/CLOPUD Submitted 12 Aug 2025 50 yards away

  Installation of an air source heat pump at roof level.

  Refused Lawful development 13 docs

• 20 Chesham Mews London SW1X 8HS

  26/00500/ADFULL Submitted 28 Jan 2026 50 yards away

  Detailed drawings of the windows pursuant to Condition 4 of planning permission dated 30th May 2025 (RN 25/01883/FULL).

  Granted Full applications Windows or glazing 9 docs

• 6 Lowndes Street London SW1X 9ET

  20/06100/ADLBC Submitted 16 Sep 2020 50 yards away

  Details of any ventilation grilles or similar associated with the internal fan coil units; the proposed grilles; where existing original floorboards or floor structure is in place and where underfloor heating is proposed; and revised consistent drawings of chimneypiece and fireplaces pursuant to Condition 4 of listed building consent dated 11 January 2019 (RN: 18/05729/LBC).

  Refused Conditions 7 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