Flat 5 Aquarius House 57A Lisson Street London NW1 5DA

1. 5 Dec 2025

   Received by Westminster

2. 27 Mar 2026

   Decision issued: Application Permitted

3. 20 Jul 2026

   Added to PlanIndex

Westminster granted permission on 27 March 2026, 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.

• Flat 4 Aquarius House 57A Lisson Street London NW1 5DA

  22/02438/FULL Submitted 10 Apr 2022 50 yards away

  Installation of three timber framed, double glazed windows to the rear.

  Granted Full applications Windows or glazing 19 docs

• Basement To First Floor Rear 63 Lisson Street London NW1 5DA

  26/04888/ADFULL Submitted 21 Jul 2026 50 yards away

  89% historically approved · decision due ~15 Sep

  Detailed drawings showing the details of the lower ground floor doors, details of section drawings of the new front windows at scale 1:10, details in writing appropriate arrangements to secure measures to mitigate the potential increased demand for on-street residents car parking in the vicinity of the site, details of how waste is to be stored on site and how materials for recycling will be stored separately, detailed drawings and specifications of screening to courtyard at ground floor level and details of detailed site investigation pursuant to condition 4, 5, 8, 10, 12 & 13 of planning permission dated 31st July 2025 (RN:25/03614/FULL)

  Awaiting decision Windows or glazing

• 63 Lisson Street London NW1 5DA

  25/08773/FULL Submitted 2 Dec 2025 50 yards away

  88% historically approved · decision due ~27 Jan

  Erection of mansard roof extension to facilitate 1-bed self-contained flat, together with the replacement of existing fenestration and creation of a third floor terrace to the rear and associated external alterations.

  Awaiting decision Full applications Extension Loft or dormer +1 24 docs

• House 1 42 Bell Street London NW1 5AW

  26/03089/FULL Submitted 11 May 2026 50 yards away

  88% historically approved · decision due ~6 Jul

  Erection of two additional floors and installation of a lift and new stairs to central courtyard at first floor level and conversion of the three five-storey houses to form nine new flats together with alterations to stairs and installation of bin and cycle stores within the central courtyard of the site.

  Awaiting decision Full applications New dwelling 28 docs
  Several homes

• First Floor 50 Lisson Street London NW1 5DF

  26/01811/FULL Submitted 19 Mar 2026 50 yards away

  88% historically approved · decision due ~14 May

  Use of the first floor as a residential unit (C3).

  Decided Full applications 11 docs

• Basement Front And Ground Floor Front 54 Lisson Street London NW1 5DF

  26/03881/FULL Submitted 12 Jun 2026 50 yards away

  88% historically approved · decision due ~7 Aug

  Use of the lower ground and ground floor as a residential unit (Class C3)

  Decided Full applications

• 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