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Planning application

103 St George's Square Mews London SW1V 3RZ

Awaiting decision Westminster 26/01650/FULL Full Planning Permission Application

Works: Extension Loft or dormer

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

Proposal

Erection of a mansard roof extension and alterations to front and rear elevations.

As published by the council, reference 26/01650/FULL

Application record

Reference
26/01650/FULL
Type
Full Planning Permission Application
Status
Pending
Received
13 Mar 2026
Validated
13 Mar 2026
Ward
Pimlico South
Postcode
SW1V 3RZ

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2026.

  • 26/06174/FULL Awaiting decision

    103 St George's Square Mews London SW1V 3RZ

    Creation of rear roof terrace on top of existing rear extension.

    Submitted 9 Sep 2026 Full applications
  • 26/05346/CLOPUD Decided

    103 St George's Square Mews London SW1V 3RZ

    Installation of three painted timber sash windows within new openings to the rear elevation.

    Submitted 6 Aug 2026 Lawful development
  • 26/01794/FULL Awaiting decision

    103 St George's Square Mews London SW1V 3RZ

    Erection of mansard roof extension, first floor rear extension and roof terrace, alterations to front and rear elevations.

    Submitted 19 Mar 2026 Full applications

Timeline

Dates from the published record

  1. 13 Mar 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 8 May 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 65 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

Steven Atkin Architects Agent, an architecture practice

11 applications on PlanIndex · across 5 councils

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

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.

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 91 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

  • 103 St George's Square Mews London SW1V 3RZ

    26/01794/FULL Submitted 19 Mar 2026 50 yards away

    87% historically approved · decision due ~14 May

    Erection of mansard roof extension, first floor rear extension and roof terrace, alterations to front and rear elevations.

    Awaiting decision Full applications Extension Loft or dormer 22 docs

  • 103 St George's Square Mews London SW1V 3RZ

    26/06174/FULL Submitted 9 Sep 2026 50 yards away

    87% historically approved · decision due ~4 Nov

    Creation of rear roof terrace on top of existing rear extension.

    Awaiting decision Full applications Extension

  • 103 St George's Square Mews London SW1V 3RZ

    26/05346/CLOPUD Submitted 6 Aug 2026 50 yards away

    86% historically approved · decision due ~1 Oct

    Installation of three painted timber sash windows within new openings to the rear elevation.

    Decided Lawful development Windows or glazing

  • Lower Ground Floor Flat 107 St George's Square London SW1V 3QP

    22/03617/FULL Submitted 31 May 2022 50 yards away

    Alterations to windows and doors and replacement paving finish to front lightwell steps.

    Granted Full applications Windows or glazing 25 docs

  • Lower Ground Floor Flat 107 St George's Square London SW1V 3QP

    22/03618/LBC Submitted 31 May 2022 50 yards away

    Alterations to windows and doors, replacement paving finish to front lightwell steps and internal alterations at lower ground floor level.

    Granted Heritage and listed buildings Windows or glazing 25 docs

  • Flat 12 89 - 91 St George's Square London SW1V 3QW

    25/06565/LBC Submitted 15 Sep 2025 50 yards away

    Replacement of the fifth floor terrace doors with bi-fold doors and the installation of additional roof insulation.

    Granted Heritage and listed buildings Windows or glazing 15 docs

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06297/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Alterations to rear elevation at basement level comprising repolacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06234/FULL Awaiting decision

    40 Grosvenor Place London SW1X 7HJ

    Use of lower ground floor of Unit 3 and ground floor of Unit 2 as gym (Class E(d)) and/ or office (Class E(g))

    Received 11 Sep, published by the council 18 Sep 2026 Full applications
  • 26/06249/FULL Awaiting decision

    53 Wimpole Street London W1G 8YH

    Removal and Installation of external rear air condensers and associated pipe work to ground floor, including internal works to ground and first floor. (Linked with 26/06250/LBC)

    Received 11 Sep, published by the council 18 Sep 2026 Full applications
  • 26/03576/FULL Decided

    15A Devonshire Terrace London W2 3DW

    Erection of an infill extension to basement courtyard to form new bedroom and internal alterations. (Linked with 26/03577/LBC)

    Received 1 Jun, published by the council 11 Sep 2026 Full applications