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Planning application

Chatham House 10 St James's Square London SW1Y 4LE

Granted Westminster 25/05354/LBC Listed Building Consent Application

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

Proposal

Remedial structural works to the lightwell and basement vault.

As published by the council, reference 25/05354/LBC

Application record

Reference
25/05354/LBC
Type
Listed Building Consent Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
31 Jul 2025
Validated
12 Aug 2025
Decided
26 Sep 2025
Ward
St James's
Decision by
Delegated Decision
Postcode
SW1Y 4LE

Site history

Applications at this address on the Westminster register

This site has had 2 applications since 2025: 1 approved, 0 refused.

  • 26/03269/LBC Awaiting decision

    Chatham House 10 St James's Square London SW1Y 4LE

    Removal of internal partition wall in the office spaces at the second floor.

    Submitted 18 May 2026 Heritage and listed buildings

Timeline

Dates from the published record

  1. 31 Jul 2025

    Received by Westminster

  2. 12 Aug 2025

    Validated

    Checked as complete and ready for consideration.

  3. 26 Sep 2025

    Decision issued: Application Permitted

  4. 21 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Pegasus Group Ltd Agent

1,244 applications on PlanIndex · across 172 councils · 91% granted

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Documents

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

21 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.

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What this grant of permission means

Westminster granted permission on 26 September 2025, 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 heritage and listed building applications

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • Chatham House 10 St James's Square London SW1Y 4LE

    26/03269/LBC Submitted 18 May 2026 50 yards away

    90% historically approved · decision due ~13 Jul

    Removal of internal partition wall in the office spaces at the second floor.

    Awaiting decision Heritage and listed buildings 1 doc

  • Flat 11 Bray House Duke Of York Street London SW1Y 6JX

    26/05463/FULL Submitted 11 Aug 2026 50 yards away

    Installation of replacement windows to the third floor rear and side elevations.

    Decided Full applications Windows or glazing

  • Flat 6 Bray House Duke Of York Street London SW1Y 6JX

    26/05843/FULL Submitted 25 Aug 2026 50 yards away

    88% historically approved · decision due ~20 Oct

    Installation of replacement windows to the second floor front elevation.

    Decided Full applications Windows or glazing 17 docs

  • 11 - 12 St James's Square London SW1Y 4LB

    25/09400/FULL Submitted 22 Dec 2025 50 yards away

    88% historically approved · decision due ~16 Feb

    External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09401/LBC)

    Awaiting decision Full applications Extension 128 docs

  • 11 - 12 St James's Square London SW1Y 4LB

    25/09401/LBC Submitted 22 Dec 2025 50 yards away

    90% historically approved · decision due ~16 Feb

    External and internal alterations, including the partial removal of non-heritage additions and the remodelling of the 1980s rear extension, provision of terraces and roof garden and associated works. (Linked to 25/09400/FULL)

    Awaiting decision Heritage and listed buildings Extension 92 docs

  • Flat 19 Bray House Duke Of York Street London SW1Y 6JX

    25/08598/FULL Submitted 25 Nov 2025 50 yards away

    Replacement of single glazed steel crittall windows with double glazed windows.

    Granted Full applications Windows or glazing 20 docs

In Westminster

  • 26/07529/LBC Awaiting decision

    69 Eaton Place London SW1X 8DF

    Installation of new cast iron water supply pipe on rear courtyard elevation. (Linked with 26/07528/FULL)

    Received 5 Nov, published by the council 6 Nov 2026 Heritage and listed buildings
  • 26/07509/LBC 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 26/07508/FULL)

    Received 4 Nov, published by the council 5 Nov 2026 Heritage and listed buildings
  • 26/07473/LBC Awaiting decision

    Flat 3 82 New Cavendish Street London W1G 9TA

    Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07472/FULL)

    Received 3 Nov, published by the council 6 Nov 2026 Heritage and listed buildings
  • 26/07471/LBC Awaiting decision

    12 Queen Anne's Gate London SW1H 9AA

    Excavation of single-storey basement, internal reconfiguration and installation of modern services. (Linked with 26/07470/FULL)

    Received 3 Nov, published by the council 5 Nov 2026 Heritage and listed buildings
  • 26/07461/LBC Awaiting decision

    1 Savile Row London W1S 3JR

    Minor internal works comprising redecoration and upgrades to lighting, flooring and bathroom and kitchen facilities, together with external works including new lighting and signage.

    Received 3 Nov, published by the council 5 Nov 2026 Heritage and listed buildings