Washington House 40 - 41 Conduit Street London W1S 2YQ

This site has had 2 applications since 2025: 1 approved, 0 refused.

• 26/05761/FULL Awaiting decision

  Washington House 40 - 41 Conduit Street London W1S 2YQ

  Use of part basement and part ground floor as dual alternative restaurant or retail (Class E) and use of part basement ground and first to sixth floors as offices (Class E), provisions for cycle storage, refuse and servicing at mezzanine level; demolition of existing roof level plant area; various extensions to the building including rear infill extension at mezzanine level, rear extension at 4th and 5th floor levels, front side and rear extensions to the 6th floor level, construction of a 7th storey extension all to provide additional office (Class E) floorspace; replacement of the rear curtain wall facade at mezzanine to 3rd floor levels; the replacement of plant within an acoustic enclosure at roof level; reconfiguration of the ground floor Conduit Street frontage and other associated development.

  Submitted 21 Aug 2026 Full applications

1. 1 Oct 2025

   Received by Westminster

2. 7 Oct 2025

   Validated

   Checked as complete and ready for consideration.

3. 23 Jun 2026

   Decision issued: Application Permitted

4. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 23 June 2026, 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.

• Washington House 40 - 41 Conduit Street London W1S 2YQ

  26/05761/FULL Submitted 21 Aug 2026 50 yards away

  87% historically approved · decision due ~16 Oct

  Use of part basement and part ground floor as dual alternative restaurant or retail (Class E) and use of part basement ground and first to sixth floors as offices (Class E), provisions for cycle storage, refuse and servicing at mezzanine level; demolition of existing roof level plant area; various extensions to the building including rear infill extension at mezzanine level, rear extension at 4th and 5th floor levels, front side and rear extensions to the 6th floor level, construction of a 7th storey extension all to provide additional office (Class E) floorspace; replacement of the rear curtain wall facade at mezzanine to 3rd floor levels; the replacement of plant within an acoustic enclosure at roof level; reconfiguration of the ground floor Conduit Street frontage and other associated development.

  Awaiting decision Full applications Extension Demolition 32 docs

• The Westbury Hotel 37 Conduit Street London W1S 2YF

  26/05770/ADFULL Submitted 24 Aug 2026 50 yards away

  89% historically approved · decision due ~19 Oct

  Details of a supplementary acoustic report pursuant to condition 7 of Planning Permission dated 25th February 2025 (RN:24/08569).

  Awaiting decision

• The Westbury Hotel 37 Conduit Street London W1S 2YF

  26/01630/FULL Submitted 12 Mar 2026 50 yards away

  87% historically approved · decision due ~7 May

  Variation of Condition 18 of planning permission dated 15th November 2024 (RN 24/02402/FULL) for: Excavation of extension to provide a second basement level, demolition and re-build of the 6th and 7th floors and extension to form new 8th floor, erection of rear extension from ground to new 8th floor level, all to enlarge existing hotel (Class C1). External alterations including alterations to the appearance of the existing facades namely, to amend the wording of Condition 18 to require that prior to occupation, a contribution be made to the Historic England Records enhancement project by way of inputting new data for the Civil War Defences for the 41 identified sites surrounding Westbury Hotel as identified within the search area of the WSI Addendum dated 04/02/2026.

  Awaiting decision Full applications Extension Demolition 6 docs

• The Westbury Hotel 37 Conduit Street London W1S 2YF

  26/02089/ADFULL Submitted 30 Mar 2026 50 yards away

  87% historically approved · decision due ~25 May

  Detailed drawings showing the following alteration to the scheme: a planting scheme within the new terrace at ninth floor level pursuant to condition 10 of planning permission dated 29th November 2024 (RN: 24/06866/FULL).

  Awaiting decision Full applications 4 docs

• The Westbury Hotel 37 Conduit Street London W1S 2YF

  22/04725/ADFULL Submitted 14 Jul 2022 50 yards away

  Details of all new windows and metal and stone framework pursuant to Condition 15 (1 & 2) of planning permission dated 09 March 2020 (RN:19/04899/FULL)

  Granted Full applications Windows or glazing 29 docs

• The Westbury Hotel 37 Conduit Street London W1S 2YF

  26/02090/ADFULL Submitted 30 Mar 2026 50 yards away

  87% historically approved · decision due ~25 May

  Details of windows and the metal and stone framework pursuant to Condition 15 of planning permission dated 15/11/2024 (RN: 24/02402/FULL)

  Awaiting decision Full applications Windows or glazing 8 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