21 Arlington Street SW1A 1RN

1. 1 Sep 2025

   Received by Westminster

2. 9 Oct 2025

   Decision issued: No objections

3. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 9 October 2025, 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.

Applications for works to trees cover protected trees: consent under a tree preservation order, or six weeks notice for trees in a conservation area. More in our guide to planning application types.

• The Ritz Hotel 150 - 156 Piccadilly London W1J 9BR

  26/04502/ADLBC Submitted 6 Jul 2026 50 yards away

  89% historically approved · decision due ~31 Aug

  Details of works to laylight of Palm Court; pursuant to condition 6 (xvii) of listed building consent dated 12th March 2026 (25/07529/LBC)

  Awaiting decision Conditions 4 docs

• The Ritz Hotel 150 - 156 Piccadilly London W1J 9BR

  26/03404/LBC Submitted 22 May 2026 50 yards away

  90% historically approved · decision due ~17 Jul

  Replacement of slate roof tiles on mansard roofs of Piccadilly, Green Park and Arlington Street elevations of the Ritz Hotel.

  Awaiting decision Heritage and listed buildings Loft or dormer Roofing 10 docs

• The Ritz Hotel 150 - 156 Piccadilly London W1J 9BR

  25/08394/ADFULL Submitted 17 Nov 2025 50 yards away

  Details of doors in William Kent House and CCTV pursuant to Condition 6 (vii (part) and xviii of listed building consent dated 24 April 2025 (RN: 24/08537/LBC).

  Granted Conditions 12 docs

• The Ritz Hotel 150 - 156 Piccadilly London W1J 9BR

  25/07555/NMA Submitted 17 Oct 2025 50 yards away

  Amendments to planning permission dated 12 July 2022 (RN: 21/07264/FULL); namely, changes to description of development to include temporary construction logistics works and to wording of Condition 7 in relation to external rainwater downpipes; and minor internal and external alterations, including removal of railings from seventh floor dormer windows on Piccadilly; and relocation of copper lion head on the roof of The Ritz.

  Granted Amendments Loft or dormer Windows or glazing 24 docs

• The Ritz Hotel 150 - 156 Piccadilly London W1J 9BR

  25/07529/LBC Submitted 17 Oct 2025 50 yards away

  Alterations and extensions to the Ritz Hotel and William Kent House including the change of use of the casino to a dual flexible use as hotel and/or private members club, a two storey side extension to William Kent House, extensions to the Ritz hotel including on the site of 22 Arlington Street comprising an extension of five basements, lower ground, ground, mezzanine and seven upper floors to provide additional hotel floorspace, new and upgraded hotel facilities including hotel rooms, restaurant and spa, new entrances on Arlington Street, arrival and drop off facilities, changes to the servicing and refuse facilities, car and cycle parking, plant, landscaping and all works including demolition, enabling, highways, temporary construction logistics works and other ancillary works (Amendments to listed building consent dated 24 April 2025 RN:24/08537/LBC).

  Granted Heritage and listed buildings Extension Demolition 428 docs

• Flat 14 Arlington House 17 - 20 Arlington Street SW1A 1RL

  25/07851/CLOPUD Submitted 29 Oct 2025 50 yards away

  Use of Flat 14 as a self-containted residential flat (Class C3).

  Withdrawn Lawful development 24 docs

• 26/07391/TCA Awaiting decision

  47 Carlton Hill London NW8 0EL

  General maintenance works unless otherwise stated: Front Garden: T1: Malus: Approximately 5.00m. Reduce crown by approximately 1.20m, reducing protruding branches back into the main crown structure. Thin crown density by up to 20%. Ensure an approximate 0.70m clearance of the lamp post. T2: Winter Flowering Cherry: Approximately 5.00m: Reduce crown by up to approximately 1.00m. Thin crown density by 15%. Remove dead wood. Rear Garden: T2: Magnolia - (smaller tree): Approximately 6.00m. Remove one large dead stem. Remove any dead wood or dying branches within the main crown structure. T3: Mature Cherry - (remaining stem): Approximately 7.00m. This tree is now completely dead. Fell to ground level. T4: Bay - (on rear boundary): Approximately 4.00m. This tree is in quite poor condition. Section fell to ground level. T5: Mature Bay - (growing within the curtilage of 40 Ryders Terrace & overhanging 47 Carlton Hill): Approximately 5.00m. Reducing the overhang of this tree will increase space and light levels at No.47. Reduce lateral and sublateral branches overhanging No.47 by up to approximately 1.25m back to as near to the boundary. Control encroachment.

  Received 29 Oct, published by the council 1 Nov 2026 Trees
• 26/07385/TCA Awaiting decision

  Garden Hall Of Residence Imperial College 10 - 12 Princes Gardens London SW7 1ND

  T238 & T239 - Arbutus unedo (Strawberry Tree): Reduce crown by specified extent - height and branch length by up to approximately 2.5m to allow cctv camera to have clear site of entry point for safety, as there a safe guarding issue for student accommodation. Pruning should be back at previous pollard points and at suitable growth points.

  Received 29 Oct, published by the council 2 Nov 2026 Trees
• 26/07365/TCA Awaiting decision

  40 Warrington Crescent London W9 1EL

  T1 -Paulownia reduce laterals by 1m from tips and height by .5m to give more light to garden area below.

  Received 28 Oct, published by the council 1 Nov 2026 Trees
• 26/07378/TCA Awaiting decision

  51 Springfield Road London NW8 0QJ

  T1: Magnolia (8m): Crown reduce by 1m and crown thin by 15% to keep tree at a size suitable for its location and as part of regular maintenance T2: Ginkgo (9m): Reduce height by 2m to keep tree at a size suitable for its location and as part of regular maintenance

  Received 28 Oct, published by the council 1 Nov 2026 Trees
• 26/07383/TCA Awaiting decision

  32 Ashworth Road W9 1JY

  t1 sycamore reduce back to most recent reduction points . last pruned 3-4 years ago t 2 & 3 ash tree as above on going maintenence . Light issues

  Received 28 Oct, published by the council 1 Nov 2026 Trees