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Planning application

3 St James's Square London SW1Y 4JU

Awaiting decision Westminster 26/00858/FULL Full Planning Permission Application

Works: Extension Windows or glazing

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

Proposal

Alterations to the St. James's Square facade including replacement of windows and entrances, at main roof level addition of roof pavilion extension, plant equipment and enclosures, with roof terraces at eight and ninth floor levels and a rear extension to accommodate a lift shaft and associated works.

As published by the council, reference 26/00858/FULL

Application record

Reference
26/00858/FULL
Type
Full Planning Permission Application
Status
Pending
Received
12 Feb 2026
Validated
12 Feb 2026
Ward
St James's
Postcode
SW1Y 4JU

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2025: 2 approved, 0 refused.

  • 25/08682/FULL Granted

    3 St James's Square London SW1Y 4JU

    Replacement and enlargement of one existing rooflight.

    Decided 19 Mar 2026 Full applications
  • 25/05780/FULL Granted

    3 St James's Square London SW1Y 4JU

    Extension of lift overrun at roof level and associated works.

    Decided 2 Oct 2025 Full applications

Timeline

Dates from the published record

  1. 12 Feb 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 9 April 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

Newmark Gerald Eve LLP Agent, registered in London

Active · incorporated 2008 · London

160 applications on PlanIndex · across 17 councils · 91% 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

25 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

  • 3 St James's Square London SW1Y 4JU

    25/08682/FULL Submitted 27 Nov 2025 50 yards away

    Replacement and enlargement of one existing rooflight.

    Granted Full applications Loft or dormer 16 docs

  • 3 St James's Square London SW1Y 4JU

    25/05780/FULL Submitted 15 Aug 2025 50 yards away

    Extension of lift overrun at roof level and associated works.

    Granted Full applications Extension 19 docs

  • Open Space Centre Of St James's Square London SW1Y 4LD

    25/06052/TPO Submitted 25 Aug 2025 50 yards away

    T146 1 x Tree of Heaven: Crown reduce to previous, most recent reduction points, pruning back to suitable growth points and retaining shortened regrowth.

    Granted Trees 7 docs

  • Charles House 5 - 11 Regent Street London SW1Y 4LR

    26/00462/FULL Submitted 27 Jan 2026 50 yards away

    88% historically approved · decision due ~24 Mar

    Replacement of a single extract fan with a new louvre on the front elevation and associated works.

    Awaiting decision Full applications 17 docs

  • 7 St James's Square London SW1Y 4JU

    26/04577/ADFULL Submitted 9 Jul 2026 50 yards away

    89% historically approved · decision due ~3 Sep

    Details of annotated elevations showing the precise location of each external item; full product specifications, finishes and dimensions; sections and fixing details demonstrating how each item will be attached to the listed fabric; and confirmation of cable routes, penetrations and any making good of historic fabric pursuant to Condition 4 of planning permission dated 19 March 2026 (RN: 25/07345/FULL).

    Decided

  • Basement And Ground Floor 13 Regent Street London SW1Y 4LR

    26/03462/ADV Submitted 27 May 2026 50 yards away

    82% historically approved · decision due ~22 Jul

    Display of two internally illuminated fascia signs measuring 0.35m x 1.88m and and one non-illuminated projecting signage measuring 0.5m x 0.5m.

    Awaiting decision Advertising 9 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