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Planning application

5 Buckingham Mews London SW1E 6NR

Awaiting decision Westminster 26/02964/FULL Full Planning Permission Application

Works: Extension Loft or dormer Windows or glazing

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

Proposal

Erection of mansard roof extension, external alterations, replacement windows, and conversion of garage to study room.

As published by the council, reference 26/02964/FULL

Application record

Reference
26/02964/FULL
Type
Full Planning Permission Application
Status
Pending
Received
6 May 2026
Validated
12 May 2026
Ward
St James's
Postcode
SW1E 6NR

Timeline

Dates from the published record

  1. 6 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

Ruddlesdin Design Agent, a design practice

15 applications on PlanIndex · across 5 councils · 83% 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

17 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 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

  • 6 Buckingham Mews London SW1E 6NR

    23/03588/NMA Submitted 28 May 2023 50 yards away

    Amendments to planning permission dated 12th December 2022 (RN:22/03987/FULL) for the conversion of ground floor garage to habitable accommodation and erection of mansard extension for use in connection with the existing first floor flat (Unit 8); and extension to the rear first floor to existing flat, Unit 2 [Site includes rear of 25-27 Catherine Place] namely; to extend the width of the flat roof to the edge of the building.

    Refused Amendments Extension Loft or dormer 15 docs

  • 3 Buckingham Mews London SW1E 6NR

    26/02298/PASPV Submitted 7 Apr 2026 50 yards away

    89% historically approved · decision due ~2 Jun

    Installation of solar panels to existing loft roof.

    Awaiting decision 15 docs

  • 4 Buckingham Mews London SW1E 6NR

    26/05833/FULL Submitted 25 Aug 2026 50 yards away

    88% historically approved · decision due ~30 Oct

    Erection of a mansard roof extension.

    Decided Full applications Extension Loft or dormer 16 docs

  • 3 Buckingham Mews London SW1E 6NR

    26/00159/CLOPUD Submitted 13 Jan 2026 50 yards away

    Installation of solar panels to existing loft roof.

    Withdrawn Lawful development 12 docs

  • 21 Stafford Place London SW1E 6NP

    26/06268/FULL Submitted 14 Sep 2026 50 yards away

    88% historically approved · decision due ~9 Nov

    Variation of Condition 1 of planning permission dated 17 April 2026 (RN 25/08897/FULL) for the erection of a mansard roof extension; Namely, to allow the addition of seven rooflights within the flat roof.

    Decided Full applications Extension Loft or dormer

  • 21 Stafford Place London SW1E 6NP

    25/08897/FULL Submitted 8 Dec 2025 50 yards away

    Erection of mansard roof extension.

    Granted Full applications Extension Loft or dormer 33 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