Washington House 40 - 41 Conduit Street London W1S 2YQ

This site has had 4 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
• 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. 29 Sep 2026

   Received by Westminster

2. 5 Oct 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 24 November 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Westminster took a median of 86 days over the applications it decided in the last year.

• 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

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided lawful development applications in a median of 107 days. More in our guide to how long planning decisions take.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. 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

  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

• 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

  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

• 42 Conduit Street London W1S 2YH

  25/07180/ADLBC Submitted 25 Sep 2025 50 yards away

  Detailed drawings (scale 1:5 & 1:2) of all new doors pursuant to Condition 3 b) of listed building consent dated 02 May 2024 (RN: 23/07572/LBC)

  Granted Conditions 13 docs

• Basement And Ground Floor 42 Conduit Street London W1S 2YH

  26/04883/ADV Submitted 21 Jul 2026 50 yards away

  82% historically approved · decision due ~16 Sep

  Display of an internally illuminated (letters only) sign measuring 0.13m x 0.79m on mullion and an internally illuminated (letters only) hanging sign measuring 0.70m x 1.25m.

  Decided Advertising

• Basement And Ground Floor 42 Conduit Street London W1S 2YH

  26/04882/FULL Submitted 21 Jul 2026 50 yards away

  88% historically approved · decision due ~16 Sep

  Installation of a replacement shopfront.

  Awaiting decision Full applications Windows or glazing

• 26/07221/CLEUD Awaiting decision

  Ground Floor Flat A 31 Fermoy Road London W9 3NH

  Confirmation of the lawful existing Use of Unit A, 31 Fermoy Road as a 4-bedroom HMO (Class C4).

  Received 21 Oct, published by the council 23 Oct 2026 Lawful development
• 26/07134/CLEUD Awaiting decision

  5A Motcomb Street London SW1X 8JU

  Confirmation of the planning consent 24/06560/FULL was lawfully implemented within the 3 year time limit period and as such the remainder of the works can be lawfully implemented.

  Received 16 Oct, published by the council 21 Oct 2026 Lawful development
• 26/06979/CLOPUD Awaiting decision

  15 Bridgewater House Hallfield Estate London W2 6EE

  Use as a private hire chauffeur business (administrative and booking management activities of AGR Chauffeurs Limited).

  Received 13 Oct, published by the council 18 Oct 2026 Lawful development
• 26/06991/CLOPUD Awaiting decision

  11 Grittleton Road London W9 2DD

  Installation of an external spiral staircase connecting these existing levels (the ground level terrace to the lower-ground level garden).

  Received 13 Oct, published by the council 15 Oct 2026 Lawful development
• 26/06932/CLOPUD Awaiting decision

  157 Oliphant Street London W10 4EA

  Installation of solar panels.

  Received 12 Oct, published by the council 13 Oct 2026 Lawful development