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Planning application

46 Eaton Place London SW1X 8AL

Granted Westminster 25/09311/CLOPUD Certificate of Lawfulness (proposed)

Works: Extension Loft or dormer Windows or glazing

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

Proposal

Confirmation that the planning permission dated 26th April 2023 (RN: 22/05260/FULL) for the 'Use of existing buildings as two separate dwellings with associated alterations and extensions, including new rear courtyard with green living wall at lower ground and ground floor levels, creation of roof terraces at rear upper ground floor and main roof levels, alterations to terrace at first floor level, replacement rear closet wing extension at first and second floor levels, replacement of mansard roof, and replacement of windows and doors on all elevations (site includes 20 Eaton Mews North)' was lawfully implemented prior to the expiration date and that it is lawful to complete the outstanding works.

As published by the council, reference 25/09311/CLOPUD

Application record

Reference
25/09311/CLOPUD
Type
Certificate of Lawfulness (proposed)
Status
Decided
Decision
Granted As published: Application Permitted
Received
23 Dec 2025
Validated
23 Dec 2025
Decided
23 Feb 2026
Ward
Knightsbridge & Belgravia
Decision by
Delegated Decision
Postcode
SW1X 8AL

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2025: 3 approved, 0 refused.

  • 26/06751/ADFULL Awaiting decision

    46 Eaton Place London SW1X 8AL

    Details of Remediation Strategy pursuant to partial discharge of Condition 5 (Phase 3) of planning permission dated 17th March 2026 (RN: 25/04439/FULL)

    Submitted 2 Oct 2026
  • 25/04439/FULL Granted

    46 Eaton Place London SW1X 8AL

    Erection of extensions at rear lower-ground, ground, first and second floor levels with roof terrace at rear first floor level; replacement mansard roof and facade alterations to mews building; basement extension; roof terrace, plant enclosure and lift overrun at main roof level. Change of use from embassy to two dwellings (Site includes 20 Eaton Mews North).

    Decided 17 Mar 2026 Full applications
  • 25/04440/LBC Granted

    46 Eaton Place London SW1X 8AL

    Erection of extensions at rear lower-ground, ground, first and second floor levels with roof terrace at rear first floor level; replacement mansard roof and facade alterations to mews building; basement extension; roof terrace, plant enclosure and lift overrun at main roof level; and associated internal alterations including to plan form and provision of lift (Site includes 20 Eaton Mews North). (Linked with 25/04439/FULL)

    Decided 17 Mar 2026 Heritage and listed buildings

Timeline

Dates from the published record

  1. 23 Dec 2025

    Received by Westminster

  2. 23 Feb 2026

    Decision issued: Application Permitted

  3. 20 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Montagu Evans LLP Agent, registered in London

Active · incorporated 2005 · London

1,345 applications on PlanIndex · across 131 councils · 97% granted

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

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Documents

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

13 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 23 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.

Nearby applications

Within 0.3 miles

  • 46 Eaton Place London SW1X 8AL

    25/04439/FULL Submitted 27 Jun 2025 50 yards away

    Erection of extensions at rear lower-ground, ground, first and second floor levels with roof terrace at rear first floor level; replacement mansard roof and facade alterations to mews building; basement extension; roof terrace, plant enclosure and lift overrun at main roof level. Change of use from embassy to two dwellings (Site includes 20 Eaton Mews North).

    Granted Full applications Extension Loft or dormer 144 docs
    Several homes

  • 52 Eaton Place London SW1X 8AL

    26/02230/ADLBC Submitted 2 Apr 2026 50 yards away

    89% historically approved · decision due ~28 May

    Detailed elevations and section of the front door and its surrounds, pursuant to condition 4 of Listed Building Consent dated 25th September 2025 (25/05109/LBC)

    Awaiting decision Conditions 4 docs

  • 52 Eaton Place London SW1X 8AL

    25/08102/ADFULL Submitted 6 Nov 2025 50 yards away

    Details of the front door pursuant to Condition 4 of planning permission dated 25th September 2025 (RN: 25/05108/FULL).

    Refused Full applications 8 docs

  • 52 Eaton Place London SW1X 8AL

    26/07131/LBC Submitted 19 Oct 2026 50 yards away

    90% historically approved · decision due ~16 Dec

    Replacement of the approved second-floor rear sash window with painted timber French doors. (Linked with 26/05674/NMA)

    Awaiting decision Heritage and listed buildings Windows or glazing

  • 52 Eaton Place London SW1X 8AL

    26/05674/NMA Submitted 19 Aug 2026 50 yards away

    93% historically approved · decision due ~14 Oct

    Amendments to planning permission dated 25 September 2025 (25/05108/FULL) for: Alterations to rear extension at first floor level including creation of rear roof terrace at second floor level; replacement of first and second floor level front windows with double glazed timber sash windows; replacement of front door; reinstatement of period windows and doors, namely to allow replacement of second floor rear full height sash window with set of French doors.

    Decided Amendments Extension Windows or glazing

  • 46 Eaton Place London SW1X 8AL

    26/06751/ADFULL Submitted 2 Oct 2026 50 yards away

    89% historically approved · decision due ~27 Nov

    Details of Remediation Strategy pursuant to partial discharge of Condition 5 (Phase 3) of planning permission dated 17th March 2026 (RN: 25/04439/FULL)

    Awaiting decision

In Westminster

  • 26/07423/CLOPUD Awaiting decision

    103 Elgin Avenue London W9 2NP

    Painting of the decorative stonework, window frames and doors on the front elevation and front boundary wall

    Received 2 Nov, published by the council 4 Nov 2026 Lawful development
  • 26/07454/CLOPUD Awaiting decision

    10 Stratton Street London W1J 8LG

    Shopfront alteration.

    Received 2 Nov, published by the council 5 Nov 2026 Lawful development
  • 26/07381/CLEUD Awaiting decision

    Ground Floor Rear Flat 4 Mozart Street London W10 4LA

    Use of the ground floor rear flat as short-term visitor accommodation.

    Received 28 Oct, published by the council 5 Nov 2026 Lawful development
  • 26/07339/CLOPUD Awaiting decision

    123 Victoria Street London SW1E 6DE

    Use of part of ground floor reception area within Class E including, but not limited to, a retail café (Class E(a)).

    Received 27 Oct, published by the council 30 Oct 2026 Lawful development
  • 26/07345/CLOPUD Awaiting decision

    New Scotland Yard Victoria Embankment London SW1A 2JL

    Installation of Solar Gard Stainless Steel 20 solar control film to the internal face of the existing fifth-floor glazing.

    Received 27 Oct, published by the council 30 Oct 2026 Lawful development