Washington House 40 - 41 Conduit Street London W1S 2YQ

This site has had 3 applications since 2023: 2 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
• 25/07055/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, and the erection of a 7th storey extension with front terrace to provide additional office (Class E) floorspace and the replacement of plant within an acoustic enclosure at roof level.

  Decided 23 Jun 2026 Full applications

1. 13 Jun 2023

   Received by Westminster

2. 27 Sep 2023

   Validated

   Checked as complete and ready for consideration.

3. 28 Sep 2023

   Decision issued: Application Permitted

4. 29 Sep 2026

   Added to PlanIndex

Westminster granted permission on 28 September 2023, 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

  25/07055/FULL Submitted 1 Oct 2025 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, and the erection of a 7th storey extension with front terrace to provide additional office (Class E) floorspace and the replacement of plant within an acoustic enclosure at roof level.

  Granted Full applications Extension 34 docs

• 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).

  Awaiting decision

• 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

• The Westbury Hotel 37 Conduit Street London W1S 2YF

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

  88% 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

• 26/06621/FULL Awaiting decision

  2 Dorset Street London W1U 4EE

  Replacement of four existing external condenser units and four internal air-conditioning units and acoustic enclosure. (Linked with 26/06436/LBC)

  28 Sep 2026 Full applications
• 26/06605/FULL Awaiting decision

  Hertford Court 14 - 15 Hertford Street London W1J 7RP

  Removal of the ground floor access gates and creation of a new facade frontage to create ancillary concierge floorspace.

  Received 28 Sep, published by the council 1 Oct 2026 Full applications
• 26/06615/FULL Awaiting decision

  6 Eccleston Street London SW1W 9LS

  Installation of ceramic tiles to ground floor elevations, awnings to front elevation, new lighting, external CCTV cameras (linked to 26/06616/ADV)

  Received 25 Sep, published by the council 30 Sep 2026 Full applications
• 26/06587/FULL Awaiting decision

  Hide Tower Regency Street London SW1P 4AA

  Facade remediation and recladding works comprising the removal of existing combustible cladding and associated façade elements, and installation of a replacement non-combustible aluminium rainscreen cladding system with associated insulation, cavity barriers and ancillary works to all elevations.

  Received 25 Sep, published by the council 1 Oct 2026 Full applications
• 26/06602/FULL Awaiting decision

  50 Grosvenor Hill London W1K 3QT

  Installation of plant equipment to the roof of 50 Grosvenor Hill, and associated works.

  Received 25 Sep, published by the council 1 Oct 2026 Full applications