26 Castellain Road London W9 1EZ

1. 7 Oct 2025

   Received by Westminster

2. 18 Nov 2025

   Decision issued: Application Permitted

3. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 18 November 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.

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.

• 24 Castellain Road London W9 1EZ

  26/06154/FULL Submitted 9 Sep 2026 50 yards away

  88% historically approved · decision due ~10 Nov

  Use of part of the existing main flat roof as a private residential roof terrace; installation of black painted metal balustrading/railings; provision of safe access to the roof terrace via a sliding rooflight; installation of an Air Source Heat Pump (ASHP) at roof terrace level; construction of enlarged dormer and a terrace the rear of the 3rd floor; and associated works.

  Awaiting decision Full applications Loft or dormer

• 149 Sutherland Avenue London W9 1ES

  26/00667/FULL Submitted 4 Feb 2026 50 yards away

  88% historically approved · decision due ~27 Apr

  Removal of the exterior staircase between upper ground floor level and garden of Flat A and installation of a Juliet balcony railing to doors at upper ground floor level and associated works.

  Awaiting decision Full applications 13 docs

• 11 Castellain Road London W9 1EY

  26/07241/TCA Submitted 22 Oct 2026 50 yards away

  100% historically approved · decision due ~17 Dec

  T1 - Mature Sycamore- Carry out a crown reduction of up to 3m in height and up to 2m laterally back to the previous, most recent established pruning points, retaining a balanced crown structure and natural form. Pruning cuts will be made to suitable growth points. T2 - Field Maple- Undertake a crown reduction of approx 2m in height and 1.5m laterally appropriate to the tree?s condition, structure and previous pruning history, whilst retaining a natural crown shape and viable growth points. Where suitable, reduce the crown to the previous reduction points, pruning back to appropriate secondary branches or growth points to create a balanced, natural-flowing canopy outline. As an Arboricultural Approved contractor (#AC2626), all works will be undertaken in accordance with BS39982010 - Tree Work - Recommendations. Reason for work: General tree maintenance

  Awaiting decision Trees

• 133 Sutherland Avenue London W9 2QJ

  25/05606/FULL Submitted 11 Aug 2025 50 yards away

  Replacement of existing double-leaf painted timber front doors with a single-leaf painted timber door.

  Granted Full applications 12 docs

• Basement And Ground Floor Flat 1 133 Sutherland Avenue London W9 2QJ

  26/02959/FULL Submitted 5 May 2026 100 yards away

  88% historically approved · decision due ~30 Jun

  Replacement of existing rear sash window sashes and door, with double glazing

  Awaiting decision Full applications Windows or glazing 9 docs

• 4A Pindock Mews London W9 2PY

  25/07015/FULL Submitted 30 Sep 2025 100 yards away

  88% historically approved · decision due ~22 Dec

  Infill of rear ground floor yard and creation of terrace above at first floor level; erection of second floor roof extension with terrace to front; alterations to windows and doors; associated alterations

  Awaiting decision Full applications Extension Windows or glazing 14 docs

• 26/07508/FULL Awaiting decision

  Buckingham Palace The Mall London SW1A 1AA

  Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

  Received 4 Nov, published by the council 5 Nov 2026 Full applications
• 26/07470/FULL Awaiting decision

  12 Queen Anne's Gate London SW1H 9AA

  Excavation of single-storey basement. (Linked with 26/07471/LBC).

  Received 3 Nov, published by the council 5 Nov 2026 Full applications
• 26/07466/FULL Awaiting decision

  65 Albion Gate Albion Street W2 2LA

  Replacement of first-floor front elevation windows and balcony door with double-glazed steel-framed units.

  Received 3 Nov, published by the council 5 Nov 2026 Full applications
• 26/07460/FULL Awaiting decision

  1 Hanover Square London W1S 1HA

  Installation of new public art sculptures and seating; hard and soft landscaping; installation of an area of raised terrace decking on St George Street measuring 43m x 2.6m for the placing of tables, chairs and banquette benches in connection with restaurant use; and associated external alterations and enabling works.

  Received 3 Nov, published by the council 5 Nov 2026 Full applications
• 26/07451/FULL Awaiting decision

  Flat 1 31 South Audley Street London W1K 2PG

  Replacement of windows, Installation of an external condenser to the rear elevation including Internal refurbishment. (linked with 26/07452/LBC)

  Received 2 Nov, published by the council 4 Nov 2026 Full applications