4 Buckingham Mews London SW1E 6NR

1. 25 Aug 2026

   Received by Westminster

2. 4 Sep 2026

   Validated

   Checked as complete and ready for consideration.

3. 4 Sep 2026

   Added to PlanIndex

4. 14 Oct 2026

   Status changed to Decided

   Previously Pending.

Westminster has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

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 Buckingham Mews London SW1E 6NR

  23/03588/NMA Submitted 28 May 2023 50 yards away

  Amendments to planning permission dated 12th December 2022 (RN:22/03987/FULL) for the conversion of ground floor garage to habitable accommodation and erection of mansard extension for use in connection with the existing first floor flat (Unit 8); and extension to the rear first floor to existing flat, Unit 2 [Site includes rear of 25-27 Catherine Place] namely; to extend the width of the flat roof to the edge of the building.

  Refused Amendments Extension Loft or dormer 15 docs

• 3 Buckingham Mews London SW1E 6NR

  26/02298/PASPV Submitted 7 Apr 2026 50 yards away

  89% historically approved · decision due ~2 Jun

  Installation of solar panels to existing loft roof.

  Awaiting decision 15 docs

• 5 Buckingham Mews London SW1E 6NR

  26/02964/FULL Submitted 6 May 2026 50 yards away

  88% historically approved · decision due ~7 Jul

  Erection of mansard roof extension, external alterations, replacement windows, and conversion of garage to study room.

  Awaiting decision Full applications Extension Loft or dormer +1 17 docs

• 3 Buckingham Mews London SW1E 6NR

  26/00159/CLOPUD Submitted 13 Jan 2026 50 yards away

  Installation of solar panels to existing loft roof.

  Withdrawn Lawful development 12 docs

• 21 Stafford Place London SW1E 6NP

  26/06268/FULL Submitted 14 Sep 2026 50 yards away

  88% historically approved · decision due ~9 Nov

  Variation of Condition 1 of planning permission dated 17 April 2026 (RN 25/08897/FULL) for the erection of a mansard roof extension; Namely, to allow the addition of seven rooflights within the flat roof.

  Awaiting decision Full applications Extension Loft or dormer

• 21 Stafford Place London SW1E 6NP

  25/08897/FULL Submitted 8 Dec 2025 50 yards away

  Erection of mansard roof extension.

  Granted Full applications Extension Loft or dormer 33 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