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Planning application

10 Wythburn Court Seymour Place London W1H 7NS

Awaiting decision Westminster 26/02794/FULL Full Planning Permission Application

Works: 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

The replacement of three rooflights with two lead clad dormers with full height windows and juliet balcony.

As published by the council, reference 26/02794/FULL

Application record

Reference
26/02794/FULL
Type
Full Planning Permission Application
Status
Pending
Received
27 Apr 2026
Validated
8 May 2026
Ward
Marylebone
Postcode
W1H 7NS

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2004: 1 approved, 0 refused.

  • 04/02286/FULL Granted

    10 Wythburn Court Seymour Place London W1H 7NS

    Erection of roof extension with terrace area (on Seymour Place/ Wythburn Place frontages), to provide additional residential accommodation for Flat 10.

    Decided 22 Jul 2004 Full applications
  • 04/02287/CAC Decided

    10 Wythburn Court Seymour Place London W1H 7NS

    Roof extension with terrace area to provide additional residential accommodation for Flat 10.

    Decided 5 Apr 2004 Heritage and listed buildings

Timeline

Dates from the published record

  1. 27 Apr 2026

    Received by Westminster

  2. 8 May 2026

    Validated

    Checked as complete and ready for consideration.

  3. 21 Jul 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 3 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 66 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

South Bank Architects Agent, an architecture practice

19 applications on PlanIndex · across 12 councils · 75% 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

10 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

  • 16 Wythburn Court Seymour Place London W1H 7NS

    05/06318/ADFULL Submitted 8 Aug 2005 50 yards away

    Details of leadwork pursuant to Condition 5 (2) of planning permission dated 5 April 2005 (RN: 05/00562).

    Granted Full applications 2 docs

  • 16 Wythburn Court Seymour Place London W1H 7NS

    05/05885/ADFULL Submitted 22 Jul 2005 50 yards away

    Details of balustrade glazing, colour of rooflight glazing bars, details of new gates to separate walkway and terrace pursuant to Condition 5 (1), (3), (4) of planning permission dated 05 April 2005 (RN: 05/00562).

    Granted Full applications Loft or dormer Windows or glazing 3 docs

  • 16 Wythburn Court Seymour Place London W1H 7NS

    05/00562/FULL Submitted 25 Jan 2005 50 yards away

    Retention of modifications to scheme allowed on appeal 16 February 2000 for mansard roof extension to form new accommodation and alteration to access and exterior of existing roof top plant rooms: - namely, alterations to windows and rooflights. [Revised Application]

    Granted Full applications Extension Loft or dormer +1 6 docs

  • 17 Wythburn Court Seymour Place London W1H 7NS

    05/00558/FULL Submitted 25 Jan 2005 50 yards away

    Retention of modifications to scheme allowed on appeal 16 February 2000 for mansard roof extension to form new accommodation and alteration to access and exterior of existing roof top plant rooms: - namely alterations to windows, rooflights, decking area and safety barrier. [Revised Application]

    Granted Full applications Extension Loft or dormer +1 5 docs

  • 9 Wythburn Court Seymour Place London W1H 7NS

    06/07052/ADFULL Submitted 31 Aug 2006 50 yards away

    Detailed construction drawings at 1:10 pursuant to Condition 2 of planning permission dated 24 August 2006 (RN 06/04697).

    Granted Full applications 3 docs

  • 9 Wythburn Court Seymour Place London W1H 7NS

    06/06303/FULL Submitted 7 Aug 2006 50 yards away

    Installation of one air conditioning unit within an enclosure on extended roof terrace at fifth floor roof level.

    Granted Full applications 6 docs

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront with Medication Dispensing Outlet.

    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 replacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06294/FULL Awaiting decision

    15 Eaton Mews South London SW1W 9HP

    Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06317/FULL Awaiting decision

    124 Hamilton Terrace London NW8 9UT

    Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06318/LBC)

    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06273/FULL Awaiting decision

    9A Grosvenor Square London W1K 5AE

    Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

    Received 14 Sep, published by the council 22 Sep 2026 Full applications