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Planning application

17 William Mews London SW1X 9HF

Awaiting decision Westminster 26/02952/NMA Non-material amendments

Works: Extension Windows or glazing Domestic

Read from the description, not a valuation. How we read the register

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

Proposal

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.

As published by the council, reference 26/02952/NMA

Application record

Reference
26/02952/NMA
Type
Non-material amendments
Status
Pending
Received
5 May 2026
Validated
12 May 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
  • 26/02286/ADFULL Awaiting decision

    17 William Mews London SW1X 9HF

    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).

    Submitted 7 Apr 2026 Full applications
  • 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. 5 May 2026

    Received by Westminster

  2. 12 May 2026

    Validated

    Checked as complete and ready for consideration.

  3. 21 Jul 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 7 July 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

12 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.

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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 amendment applications in a median of 81 days. More in our guide to how long planning decisions take.

About amendment applications

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 17 William Mews London SW1X 9HF

    26/02286/ADFULL Submitted 7 Apr 2026 50 yards away

    88% historically approved · decision due ~2 Jun

    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).

    Awaiting decision Full applications 5 docs

  • 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

  • 26/07459/NMA Awaiting decision

    1 Hanover Square London W1S 1HA

    Amendments to planning pemrission dated 10 October 2025 (RN: 25/01558/FULL) for the: Partial demolition, refurbishment and extension of the existing building to provide a sub-basement, basement, ground plus eight storey building; infilling and stepped rear extension; excavation of a new sub-basement level; installation of new plant equipment at basement and roof level; terraces at fourth, fifth, sixth, seventh and eighth floor levels; soft and hard landscaping; reprovision of car parking; new cycle parking facilities; and associated external works. Use of the building for retail and/or restaurant (Class E) on part ground floor and office (Class E) on all other floors. NAMELY, to allow alterations to the design of the ground floor frontages on Hanover Square and St George Street.

    Received 3 Nov, published by the council 5 Nov 2026 Amendments
  • 26/07438/NMA Awaiting decision

    29 - 31 Hill Street London W1J 5LS

    Amendments to planning permission dated 1st July 2025 (RN 25/01006/FULL) for the external alterations at roof level including the creation of Level 04 roof terrace for use in association with existing office (Class E), replacement and installation of new plant and landscaping, replacement of windows, introduction of louvres, removal and replacement of rooflights, installation of new rooflight and other associated works. NAMELY, for alterations comprising of the removal of window sash boxes and weights, changes to the window mullion arrangement, the removal of two sash windows, the installation of secondary glazing, the removal of existing chamber hatch and installation of extract vent and integrated bench, the external replacement of rainwater goods and hoppers, the removal of bricks and installation of airbricks, minor demolition works, replacement of roof covering, removal of ductwork, roof plant rearrangement, the installation of a new external door to plant area, minor layout alterations and other associated works.

    Received 2 Nov, published by the council 6 Nov 2026 Amendments
  • 26/07389/NMA Decided

    Flat 1 5 Grittleton Road London W9 2DD

    Amendments to planning permission dated 04 June 2025 (RN: 25/02022/FULL), NAMELY, amendment of Condition 4 to correct the property address from 9 Aldridge Road Villas to Flat 1 5 Grittleton Road.

    29 Oct 2026 Amendments
  • 26/07377/NMA Awaiting decision

    60 Ledbury Road London W11 2AJ

    Amendments to planning permission dated 2nd October 2025 (RN 25/04018/FULL) for the Partial demolition, refurbishment, and erection of a mansard roof extension to form a new third floor with dormers to front, side and rear elevations; to form 6 flats (Class C3) on upper floors; external plant equipment and ductwork; lower ground floor excavation to increase floor to ceiling height; replacement windows; cycle parking and associated external alterations; use of the part ground floor and lower ground floor as retail and restaurant (Class E). Site includes 60-68 Ledbury Road) NAMELY, An amendment to the basement and ground floor drawing reference numbers; amendment to the description of development, in reference to restaurant and or retail use; and amendments to C

    Received 28 Oct, published by the council 3 Nov 2026 Amendments
  • 26/07375/NMA Awaiting decision

    77 Hereford Road London W2 5BB

    Amendments to planning permission dated 4th August 2026 (RN 26/03970/FULL) for the Replacement of roof terrace access stair with glazed hatch, new timber decking and front and rear roof railings to roof terrace, with infilling side window of closet wing. NAMELY, Hinged hatch access substituted by sliding hatch.

    Received 28 Oct, published by the council 3 Nov 2026 Amendments