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

• 26/06295/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
• 26/06297/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Alterations to rear elevation at basement level comprising replacement window and installation of double opening door.

  Received 15 Sep, published by the council 17 Sep 2026 Full applications
• 26/06294/FULL Awaiting decision

  15 Eaton Mews South London SW1W 9HP

  Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06317/FULL Awaiting decision

  124 Hamilton Terrace London NW8 9UT

  Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06318/LBC)

  Received 15 Sep, published by the council 22 Sep 2026 Full applications
• 26/06273/FULL Awaiting decision

  9A Grosvenor Square London W1K 5AE

  Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

  Received 14 Sep, published by the council 22 Sep 2026 Full applications