4 - 5 Cavendish Mews North London W1W 6LA

This site has had 4 applications since 2025: 4 approved, 0 refused.

• 26/00516/NMA Granted

  4 - 5 Cavendish Mews North London W1W 6LA

  Amendments to planning permission dated 12th June 2024 (RN 24/00473/FULL) for the erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3). NAMELY, roof extension reprofiling.

  Decided 30 Mar 2026 Amendments
• 25/08645/FULL Granted

  4 - 5 Cavendish Mews North London W1W 6LA

  Variation of condition 1 of planning permission dated 12 June 2024 (RN: 24/00473/FULL) for the: Erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3). Namely, to allow the installation of an air source heat pump within a roof level acoustic enclosure. (Application under section 73 of the Act).

  Decided 30 Mar 2026 Full applications
• 25/06141/NMA Granted

  4 - 5 Cavendish Mews North London W1W 6LA

  Amendments to planning permission dated 12th June 2024 (RN:24/00473/FULL) for Erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3) namely, the repositioning of windows to function as a skylight within the second floor mansard roof, the northernmost rooflight to be repositioned to serve as a secondary means of escape, the northernmost window at first floor level to be reconfigured to match the positioning of the existing surveyed windows and the omission of two rooflights.

  Decided 22 Sep 2025 Amendments

1. 19 Nov 2025

   Received by Westminster

2. 9 Mar 2026

   Decision issued: Application Permitted

3. 20 Aug 2026

   Added to PlanIndex

Westminster granted permission on 9 March 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.

• Abercorn School 38 Portland Place London W1B 1LS

  26/00352/LBC Submitted 21 Jan 2026 20m away

  90% historically approved · decision due ~18 Mar

  Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00351/FULL)

  Awaiting decision Heritage and listed buildings New dwelling 61 docs

• Abercorn School 38 Portland Place London W1B 1LS

  26/00351/FULL Submitted 21 Jan 2026 20m away

  87% historically approved · decision due ~18 Mar

  Internal alterations to 38 Portland Place throughout to change the use from sui generis (Institutional Use) to Class E office use throughout in connection with removal of link building between 38 Portland Place and 9 Cavendish Mews North at ground, first and second floors, formation of a new rear stair core to main building and new external fire escape stair. New terraces to office space in connection with plant space and the installation of air source heat pumps. Alterations to the front and rear facades of the mews building in connection with internal alterations to create new residential units and new plant space to mews roof level and new terrace spaces all in connection with the change of use of ground to first floors from sui generis (institutional use) and second floor Class E (office use) of 9 Cavendish Mews North to Class C3 residential use to form 3x 1 bedroom flats. (Part of a land swap with 1 Marylebone High Street and Moxon House). (Linked to 26/00352/LBC)

  Awaiting decision Full applications New dwelling 85 docs

• 4 - 5 Cavendish Mews North London W1W 6LA

  26/00516/NMA Submitted 29 Jan 2026 21m away

  Amendments to planning permission dated 12th June 2024 (RN 24/00473/FULL) for the erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3). NAMELY, roof extension reprofiling.

  Granted Amendments Extension 15 docs
  Domestic

• 4 - 5 Cavendish Mews North London W1W 6LA

  25/06141/NMA Submitted 28 Aug 2025 21m away

  Amendments to planning permission dated 12th June 2024 (RN:24/00473/FULL) for Erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3) namely, the repositioning of windows to function as a skylight within the second floor mansard roof, the northernmost rooflight to be repositioned to serve as a secondary means of escape, the northernmost window at first floor level to be reconfigured to match the positioning of the existing surveyed windows and the omission of two rooflights.

  Granted Amendments Extension Loft or dormer +1 13 docs
  Domestic

• 4 - 5 Cavendish Mews North London W1W 6LA

  25/08645/FULL Submitted 26 Nov 2025 22m away

  Variation of condition 1 of planning permission dated 12 June 2024 (RN: 24/00473/FULL) for the: Erection of a roof extension and alterations to the front elevation to enlarge and alter residential dwelling (Class C3). Namely, to allow the installation of an air source heat pump within a roof level acoustic enclosure. (Application under section 73 of the Act).

  Granted Full applications Extension 13 docs
  Domestic

• L'ecole Internationale Franco-Anglaise 36 Portland Place London W1B 1LS

  25/09231/FULL Submitted 19 Dec 2025 26m away

  Removal of reciprocal means of escape shared between 34 Portland Place and 36 Portland Place and implementation of fire upgrades throughout 36 Portland Place to ensure compliance with current building regulations affecting educational institutions within listed buildings. Works incorporate removal of redundant fire escape doors, upgrades to existing door furniture, installation of partitions to create fire separation lobbies, installation of mechanical extract among other minor alterations (Linked to 25/09232/LBC)

  Withdrawn Full applications 28 docs

• 26/06024/FULL Awaiting decision

  House Of Commons Palace Of Westminster Parliament Square London SW1A 0AA

  Installation of new and replacement electronic equipment within Speaker. (Linked with 26/06025/LBC)

  3 Sep 2026 Full applications
• 26/06017/FULL Awaiting decision

  38 Lauderdale Mansions Lauderdale Road London W9 1NE

  Installation of an external AC Unit / Heat Pump at roof level.

  2 Sep 2026 Full applications
• 26/05938/FULL Awaiting decision

  24 Vincent Square London SW1P 2NJ

  Subdivision of existing residential property to create two self-contained 3-bedroom family homes, along with cycle parking and associated external alterations.

  1 Sep 2026 Full applications
• 26/05935/FULL Awaiting decision

  47 Hereford Road London W2 5AH

  Installation of one number new external condenser unit to the southerly elevation service alley.

  1 Sep 2026 Full applications
• 26/05959/FULL Awaiting decision

  Basement And Ground Floor 50 New Bond Street London W1S 1BJ

  Installation of three new condensers on the roof, within an existing designated plant area.

  1 Sep 2026 Full applications