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Planning application

45 William Mews London SW1X 9HQ

Granted Westminster 25/08053/CLOPUD Certificate of Lawfulness (proposed)

Works: Windows or glazing

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Replacement of existing single glazed windows and doors with double glazed timber windows and doors.

As published by the council, reference 25/08053/CLOPUD

Application record

Reference
25/08053/CLOPUD
Type
Certificate of Lawfulness (proposed)
Status
Decided
Decision
Granted As published: Application Permitted
Received
5 Nov 2025
Validated
13 Nov 2025
Decided
13 Feb 2026
Ward
Knightsbridge & Belgravia
Decision by
Delegated Decision
Postcode
SW1X 9HQ

Timeline

Dates from the published record

  1. 5 Nov 2025

    Received by Westminster

  2. 13 Nov 2025

    Validated

    Checked as complete and ready for consideration.

  3. 13 Feb 2026

    Decision issued: Application Permitted

  4. 20 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Robin Ashley Architects LLP Agent, an architecture practice registered in Sheffield

Active · incorporated 2004 · Sheffield

14 applications on PlanIndex · across 10 councils · 75% granted

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Documents

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

11 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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What this grant of permission means

Westminster granted permission on 13 February 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.

About lawful development applications

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

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In Westminster

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