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Planning application

17 William Mews London SW1X 9HF

Awaiting decision Westminster 26/02286/ADFULL Approval of Details (Full PP)

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

Details of all flood resilient and resistant measures (including finished floor levels) pursuant to condition 4 of planning permission dated 17th June 2025 (RN: 24/07507/FULL).

As published by the council, reference 26/02286/ADFULL

Application record

Reference
26/02286/ADFULL
Type
Approval of Details (Full PP)
Status
Pending
Received
7 Apr 2026
Validated
7 Apr 2026
Ward
Knightsbridge & Belgravia
Postcode
SW1X 9HF

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2025.

  • 26/04409/FULL Decided

    17 William Mews London SW1X 9HF

    Variation of Condition 1 of planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration; excavation of a new basement below part existing dwellinghouse; Namely, amendments to the ground floor windows.

    Submitted 3 Jul 2026 Full applications
  • 26/02952/NMA Awaiting decision

    17 William Mews London SW1X 9HF

    Amendments to planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.; NAMELY minor amendments to the ground floor front elevation including revisions to the approved window openings, together with associated minor internal reconfiguration works.

    Submitted 5 May 2026 Amendments
  • 25/09184/ADFULL Decided

    17 William Mews London SW1X 9HF

    Details Code of Construction Practice pursuant to condition 3 of planning permission dated 17 June 2025 (24/07507/FULL).

    Decided 29 Sep 2026

Timeline

Dates from the published record

  1. 7 Apr 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 2 June 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.

Who's behind it

Company information only, from the register and Companies House

Savills Limited Agent, registered in London

Active · incorporated 1987 · London

2,475 applications on PlanIndex · across 194 councils · 92% granted

Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.

See their track record

Documents

Plans, drawings, consultee responses and the officer's report

5 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Watch members (£5 a month) open the document list from here.

Open the documents

What happens while it is decided

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.

About full applications

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.

Nearby applications

Within 0.3 miles

  • 17 William Mews London SW1X 9HF

    26/02952/NMA Submitted 5 May 2026 50 yards away

    93% historically approved · decision due ~7 Jul

    Amendments to planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.; NAMELY minor amendments to the ground floor front elevation including revisions to the approved window openings, together with associated minor internal reconfiguration works.

    Awaiting decision Amendments Extension Windows or glazing 12 docs
    Domestic

  • 17 William Mews London SW1X 9HF

    26/04409/FULL Submitted 3 Jul 2026 50 yards away

    88% historically approved · decision due ~1 Sep

    Variation of Condition 1 of planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration; excavation of a new basement below part existing dwellinghouse; Namely, amendments to the ground floor windows.

    Decided Full applications Extension Windows or glazing 16 docs
    Domestic

  • 17 William Mews London SW1X 9HF

    25/09184/ADFULL Submitted 19 Dec 2025 50 yards away

    Details Code of Construction Practice pursuant to condition 3 of planning permission dated 17 June 2025 (24/07507/FULL).

    Decided

  • 11 Lowndes Square London SW1X 9HB

    26/02696/CLLB Submitted 22 Apr 2026 50 yards away

    89% historically approved · decision due ~23 Jun

    External repairs and redecoration to the front and rear elevations; and other associated works at 11-12 Lowndes Square.

    Awaiting decision 5 docs

  • 43 William Mews London SW1X 9HQ

    25/09117/FULL Submitted 17 Dec 2025 50 yards away

    Erection of an infill extension at ground and first floor rear replacing the existing first floor enclosed balcony and the ground floor undercroft; installation of new rooflight on main roof.

    Granted Full applications Extension Loft or dormer 13 docs

  • 23 Lowndes Square London SW1X 9HD

    04/05743/FULL Submitted 23 Jul 2004 100 yards away

    Installation of automatic security gate to an existing opening on front elevation of block No. 25 (site includes 23-25 Lowndes Square).

    Granted Full applications 5 docs

In Westminster

  • 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