Second Floor And Third Floor Maisonette 1 Castellain Road London W9 1EY

1. 27 Jan 2026

   Received by Westminster

2. 21 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 24 March 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 91 days over the applications it decided in the last year.

This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 119 days. More in our guide to how long planning decisions take.

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.

• 11 Pindock Mews London W9 2PY

  26/01678/FULL Submitted 16 Mar 2026 50 yards away

  88% historically approved · decision due ~19 Jun

  Conversion of garage into a habitable space including alterations to existing pitched roof to create roof extension including installation of two dormer windows to the front elevation and two dormer windows with infill roof slope to the rear elevation. (Retrospective and includes amendments to works approved under application 24/04993/FULL including resolving of discrepancies in the front and rear elevations including modifications to windows, dormer design, and materials).

  Awaiting decision Full applications Extension Loft or dormer +1 18 docs

• 28 Formosa Street London W9 2QA

  26/01595/TCA Submitted 11 Mar 2026 50 yards away

  100% historically approved · decision due ~6 May

  1 x bay: fell

  Awaiting decision Trees 10 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 - Sycamore: Crown reduce by 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: Crown reduce by approx 2m in height and 1.5m laterally 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.

  Awaiting decision Trees

• 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

• 9 Warrington Gardens London W9 2QB

  25/06143/TPO Submitted 29 Aug 2025 50 yards away

  1x London plane (T1, Front); Reduce crown back to most recent reduction points leaving suitable shortened soft furnishing growth with a natural balanced canopy

  Granted Trees 8 docs

• 7A Pindock Mews London W9 2PY

  25/06168/ADFULL Submitted 29 Aug 2025 100 yards away

  Detail elevation drawings, section drawings of the new windows and doors and a sample of the glass (at least 300mm square) and window restrictors to allow maximum opening of 20cm pursuant to condition 4 and 5 of planning permission dated 28th July 2025 (RN:25/03892/FULL)

  Refused Full applications Windows or glazing 11 docs

• 26/07528/FULL Awaiting decision

  69 Eaton Place London SW1X 8DF

  Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

  Received 5 Nov, published by the council 6 Nov 2026 Full applications
• 26/05200/FULL Decided

  1 The Court House 165 Seymour Place London W1H 4PU

  Installation of waterproofing system to the existing lead flat roofs

  Received 3 Aug, published by the council 28 Aug 2026 Full applications
• 26/07521/FULL Awaiting decision

  Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

  Installation of one external condenser unit

  Received 4 Nov, published by the council 6 Nov 2026 Full applications
• 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
• 26/07472/FULL Awaiting decision

  Flat 3 82 New Cavendish Street London W1G 9TA

  Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

  Received 3 Nov, published by the council 6 Nov 2026 Full applications