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

  90% 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

  87% historically approved · decision due ~12 Jan

  Detailes of door and door furniture pursuant to Condition 6 (vii) of listed building consent dated 24 April 2025 (RN: 24/08537/LBC)

  Awaiting decision Full applications 5 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

• 26/06333/TCA Awaiting decision

  Basement 17 Claverton Street London SW1V 3AY

  Removal of an overgrown and poor specimen Leyland cypress tree in a confined space in the rear garden of 17 Claverton Street, Sw1v 3AY. We wish to remove this tree and replace it with a semi mature Amelanchier Lamarckii which is more appropriate for the space.

  Received 16 Sep, published by the council 17 Sep 2026 Trees
• 26/06346/TPO Awaiting decision

  Crown Court 123 Park Road London NW8 7JH

  Front T1 Lime x 1 (Tilia spp) This 12m triple stem mature lime tree has previously been reduced, its cyclical prune is now due. The lateral growth is touching the windows and hangs low over the road. Suggested work: - crown reduction - reduce height 2m back to previous reduction points - reduce the lateral growth 2-2.5m back to previous reduction points, leaving furnishing growth - retain 50% of internal fine branch structure Front T2 Lime x 1 (Tilia spp) This 12m triple stem mature lime tree has previously been reduced, its cyclical prune is now due. The lateral growth is touching the windows and hangs low over the road. Suggested work: - crown reduction - reduce height 2m back to previous reduction points - reduce the lateral growth 2-2.5m back to previous reduction points, leaving furnishing growth - retain 50% of internal fine branch structure Front T3 London Plane x 1 (Platanus x hispanica) This 16m mature London plane has previously been pollarded, its cyclical prune is now due. Regrowth is touching the building and encroaching upon the balconies. Suggested work:- reduce all round 2-3m back to previous

  Received 16 Sep, published by the council 17 Sep 2026 Trees
• 26/06307/TCA Awaiting decision

  140 Loudoun Road London NW8 0ND

  T1 Acer reduce by cira 1.5m to suitable pruning points T2 Mature apple tree - Crown lift to 2.5 metres from the ground and cut back from the public infrastructure. T3 Magnolia grandiflora - reduce by 1.5m and cut back from building creating a clearance of 2m T4 - Apple Tree - Remove deadwood and reduce crown by 1m Reason for work: General tree maintenance

  Received 15 Sep, published by the council 17 Sep 2026 Trees
• 26/06302/TCA Awaiting decision

  Old Admiralty Building Spring Gardens London SW1A 2AH

  fell to 50mm from ground level Cherry trees in pots in courtyard (G1 - trees have extensive damage to main stems and crown)

  Received 15 Sep, published by the council 17 Sep 2026 Trees
• 26/06282/TCA Awaiting decision

  13 Randolph Crescent London W9 1DP

  T4 - Reduce magnolia crown by 0.5?1m and thin by 10-15% all around, and remove any deadwood whilst retaining furnishing growth. This is to allow more light through the canopy and maintain the crown at a manageable size.

  Received 14 Sep, published by the council 17 Sep 2026 Trees