Washington House 40 - 41 Conduit Street London W1S 2YQ

This site has had 4 applications since 2023: 2 approved, 0 refused.

• 26/06665/CLEUD Awaiting decision

  Washington House 40 - 41 Conduit Street London W1S 2YQ

  Confirmation that material operations comprised in the development granted planning permission on 29 September 2023 (Ref: 23/03930/FULL) lawfully began before the expiry of the three year time period.

  Submitted 29 Sep 2026 Lawful development
• 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
• 23/03930/FULL Granted

  Washington House 40 - 41 Conduit Street London W1S 2YQ

  Use of basement and part ground floor as dual alternative restaurant or retail (Class E) and use of part ground and first to sixth floors as offices (Class E), including provisions for cycle storage, refuse and servicing.

  Decided 28 Sep 2023 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

  23/03930/FULL Submitted 13 Jun 2023 50 yards away

  Use of basement and part ground floor as dual alternative restaurant or retail (Class E) and use of part ground and first to sixth floors as offices (Class E), including provisions for cycle storage, refuse and servicing.

  Granted Full applications 25 docs

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

  26/06665/CLEUD Submitted 29 Sep 2026 50 yards away

  84% historically approved · decision due ~24 Nov

  Confirmation that material operations comprised in the development granted planning permission on 29 September 2023 (Ref: 23/03930/FULL) lawfully began before the expiry of the three year time period.

  Awaiting decision Lawful development

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

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

  88% 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).

  Decided

• The Westbury Hotel 37 Conduit Street London W1S 2YF

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

  88% 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

  26/06518/ADFULL Submitted 23 Sep 2026 50 yards away

  89% historically approved · decision due ~18 Nov

  Details of new windows, metal and stone framework for the Conduit Street facade pursuant to condition 15 of planning permission dated 15 November 2024 (RN: 24/02402/FULL).

  Awaiting decision Windows or glazing

• 26/07528/FULL Awaiting decision

  69 Eaton Place London SW1X 8DF

  Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

  Received 5 Nov, published by the council 6 Nov 2026 Full applications
• 26/05200/FULL Decided

  1 The Court House 165 Seymour Place London W1H 4PU

  Installation of waterproofing system to the existing lead flat roofs

  Received 3 Aug, published by the council 28 Aug 2026 Full applications
• 26/07521/FULL Awaiting decision

  Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

  Installation of one external condenser unit

  Received 4 Nov, published by the council 6 Nov 2026 Full applications
• 26/07508/FULL Awaiting decision

  Buckingham Palace The Mall London SW1A 1AA

  Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

  Received 4 Nov, published by the council 5 Nov 2026 Full applications
• 26/07472/FULL Awaiting decision

  Flat 3 82 New Cavendish Street London W1G 9TA

  Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

  Received 3 Nov, published by the council 6 Nov 2026 Full applications