Byron House 7 - 9 St James's Street London SW1A 1EE

1. 31 Jul 2026

   Received by Westminster

2. 9 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 25 September 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.

• 19 Crown Passage London SW1Y 6PP

  22/04746/LBC Submitted 15 Jul 2022 50 yards away

  Internal alterations at basement level.

  Granted Heritage and listed buildings 16 docs

• 20 King Street St James's London SW1Y 6QY

  23/03379/CLLB Submitted 22 May 2023 50 yards away

  Works at third floor level in relation to office fit-out.

  Granted 9 docs

• First Floor To Third Floor 20 King Street St James's London SW1Y 6QY

  23/03924/LBC Submitted 12 Jun 2023 50 yards away

  Internal alterations at second floor level including addition of partitions and other associated works Second Floor Level 20 King Street St James's London SW1Y 6QY

  Granted Heritage and listed buildings 13 docs

• 20 Crown Passage London SW1Y 6PP

  26/02827/CLLB Submitted 24 Apr 2026 50 yards away

  89% historically approved · decision due ~19 Jun

  Air conditioning condenser unit on the back wall of the property, at intermediate 2nd- 3rd floor level. 3 air conditioning condenser units provide the heating system for the upper 3 floors of the property. They are partially or fully hidden from the view of the properties opposite. 2 units have been present for more than 10 years, the 3rd unit for more than 4 years.

  Awaiting decision 2 docs
  Several homes

• 20 Crown Passage London SW1Y 6PP

  26/01245/FULL Submitted 4 Feb 2026 50 yards away

  Installation of two air conditioning units to rear elevation. Installation air vent cover at ground floor level to Crown Passage side elevation.

  Granted Full applications 20 docs

• 3 St James's Street London SW1A 1EG

  25/05974/COLBC Submitted 21 Aug 2025 50 yards away

  90% historically approved · decision due ~3 Nov

  Installation of original gas lantern.

  Awaiting decision Heritage and listed buildings 25 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
• 26/07229/FULL Awaiting decision

  5 D'arblay Street London W1F 8DL

  Alterations to the existing fixed windows to form two openable sash windows. (Linked with 26/07230/ADV)

  Received 22 Oct, published by the council 26 Oct 2026 Full applications
• 26/07224/FULL Awaiting decision

  8 Hinde Street London W1U 3BQ

  Use of the building as an Embassy (sui generis) with reversion to Class E on cessation of occupation by the Government of the United Mexican States. Erection of a flagpole to front elevation.

  Received 22 Oct, published by the council 26 Oct 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