14 Cavendish Square London W1G 9DB

1. 25 Aug 2026

   Received by Westminster

2. 5 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 20 October 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 61 days over the applications it decided in the last year.

This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

This page mirrors an entry on the statutory planning register that Westminster is required to keep. The published feed for this record does not state which type of application it is, which is common for older entries and for some council systems; the register entry on the council portal will say, alongside the case officer and any consultation dates.

Every planning application follows the same broad path: submission, validation, publicity, then a decision by officers or committee. Our guide to planning application types explains the common types and what each can approve.

• 14 Cavendish Square London W1G 9DB

  26/05855/ADLBC Submitted 26 Aug 2026 0m away

  89% historically approved · decision due ~21 Oct

  Details of doors (external) showing adjoining fabric and key details, windows showing adjoining fabric and key details, sliding roof lights above stair leading to roof terrace showing adjoining fabric and key details, works to the vaults, including any tanking and all sides of roof access leading to roof top terrace to be solid not glazed pursuant to conditions 3 (Part 1,2,3 and 6) and Condition 9 of Listed Building Consent dated 11th March 2026 (RN: 25/07887/LBC).

  Awaiting decision Loft or dormer Windows or glazing

• 14 Cavendish Square London W1G 9DB

  26/05840/ADFULL Submitted 25 Aug 2026 0m away

  89% historically approved · decision due ~20 Oct

  Details of photographs and specification of facing materials; external doors, windows, sliding roof lights, and railings; and all sides of roof access pursuant to conditions 21, 25 and 26 of planning permission dated 11 March 2026 (RN: 25/07886/FULL). (Linked with 26/05855/ADLBC)

  Awaiting decision Loft or dormer Windows or glazing

• 14 Cavendish Square London W1G 9DB

  26/04714/ADLBC Submitted 14 Jul 2026 0m away

  90% historically approved · decision due ~14 Sep

  Detailed drawings of the sliding roof lights above stair leading to roof terrace showing adjoining fabric and key details and detailed study and drawings of the roof light over the stair and its relationship to the existing decorative plasterwork pursuant to condition 3 (5) and (8) of listed building dated 11th March 2026 (RN:25/07887/LBC)

  Awaiting decision Conditions Loft or dormer 27 docs

• 14 Cavendish Square London W1G 9DB

  25/07887/LBC Submitted 30 Oct 2025 0m away

  90% historically approved · decision due ~25 Dec

  Refurbishment of 14 Cavendish Square, including modest internal and external alterations, and amendments to use comprising the re-location of a residential unit (Class C3) and increased museum floorspace (Class F1). (Linked to 25/07886/FULL)

  Awaiting decision Heritage and listed buildings 143 docs

• 14 Cavendish Square London W1G 9DB

  25/05407/ADFULL Submitted 1 Aug 2025 0m away

  Details of an Operational Management Plan pursuant to Condition 3 of planning permission dated 9th April 2025 (RN: 25/00722/FULL)

  Granted Full applications 11 docs

• 14 Cavendish Square London W1G 9DB

  25/07886/FULL Submitted 30 Oct 2025 5m away

  87% historically approved · decision due ~25 Dec

  Refurbishment of 14 Cavendish Square, including modest internal and external alterations, and amendments to use comprising the re-location of a residential unit (Class C3) and increased museum floorspace (Class F1). (Linked to 25/07887/LBC)

  Awaiting decision Full applications 141 docs