Windsor House 40 - 41 Great Castle Street London W1W 8LU

1. 11 Sep 2025

   Received by Westminster

2. 30 Oct 2025

   Decision issued: Application Permitted

3. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 30 October 2025, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. 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.

• Ashley House 12 Great Portland Street London W1W 8QN

  03/05116/FULL Submitted 30 Jun 2003 50 yards away

  Use of the ground floor for mixed retail (Class A1) and wholesale showroom purposes

  Granted Full applications 8 docs

• Ashley House 12 Great Portland Street London W1W 8QN

  08/02160/ADV Submitted 5 Mar 2008 50 yards away

  Display of an externally illuminated projecting sign.

  Granted Advertising 7 docs

• Basement And Ground Floor Ashley House 12 Great Portland Street London W1W 8QN

  25/00312/ADFULL Submitted 17 Jan 2025 50 yards away

  87% historically approved · decision due ~14 Mar

  Details of a delivery and operational management plan pursuant to Condition 8 of planning permission dated 9th January 2025 (RN:24/05110/FULL)

  Awaiting decision Full applications 3 docs

• Ashley House 12 Great Portland Street London W1W 8QN

  04/04290/ADV Submitted 4 Jun 2004 50 yards away

  Display of non-illuminated fascia and two non-illuminated projecting signs.

  Decided Advertising 5 docs

• Ashley House 12 Great Portland Street London W1W 8QN

  03/08498/AD7 Submitted 4 Nov 2003 50 yards away

  Display for a temporary period of six months of a non-illuminated 'to let' board located on the face of the building at a height of between 3m and 4.6m above pavement level and measuring 1.2m x 0.9m.

  Granted Advertising 2 docs

• Kent House 14 - 17 Market Place London W1W 8AJ

  25/07870/ADV Submitted 30 Oct 2025 50 yards away

  Display of one non illuminated fascia sign measuring 0.2m x 1.6m and two externally illuminated acrylic globe with applied lettering measuring 0.36m x 0.3m.

  Granted Advertising 9 docs

• 26/06331/FULL Awaiting decision

  31G Nottingham Place London W1U 5LP

  Installation of a condenser within acoustic enclosure and metal railing on the rear flat roof at third-floor level.

  Received 16 Sep, published by the council 23 Sep 2026 Full applications
• 26/06328/FULL Awaiting decision

  Athena Court 2 Finchley Road London NW8 6DP

  Installation of a multifunctional communication Hub including defibrillator outside Athena Court. (Linked with 26/06329/ADV)

  Received 16 Sep, published by the council 23 Sep 2026 Full applications
• 26/06340/FULL Awaiting decision

  141 Harley Street London W1G 6BQ

  Variation of Condition 1 of planning permission dated 22 December 2026 (RN: 16/05372/FULL) for: Demolition of mews buildings at 28 and 29 Devonshire Mews West and lower ground and ground floor link building at the rear of 141 Harley Street and the erection of new building to include a three storey basement to the rear of the site in connection with the use of the 141 Harley Street and the lower ground and ground floor of 143 Harley Street for Class D1 medical purposes; installation of a new passenger lift to the rear of 141 Harley Street and installation of plant. (Site includes excavation part way under the pavement of Devonshire Mews West and use swap with 126 Harley Street) namely, to allow creation of party wall openings at basement, ground and first floors; insertion of a platform lift within No. 143 from basement to first floors; partial infilling of the rear basement area; and other minor adjustments to plan form. (Linked with 26/06290/LBC)

  Received 16 Sep, published by the council 23 Sep 2026 Full applications
• 26/06341/FULL Awaiting decision

  141 Harley Street London W1G 6BQ

  Installation of new sesame lift into existing front entrance steps. (Linked with 26/06342/LBC)

  Received 16 Sep, published by the council 23 Sep 2026 Full applications
• 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