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Planning application

11 Montagu Mews South London W1H 7ER

Awaiting decision Westminster 26/03408/FULL Full Planning Permission Application

Works: Windows or glazing

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

Proposal

Installation of replacement existing windows with double glazed units to improve the thermal performance of the property.

As published by the council, reference 26/03408/FULL

Application record

Reference
26/03408/FULL
Type
Full Planning Permission Application
Status
Pending
Received
22 May 2026
Validated
22 May 2026
Ward
Marylebone
Postcode
W1H 7ER

Timeline

Dates from the published record

  1. 22 May 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 17 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

Quatrefoils Ltd Agent, registered in Ruislip

Active · incorporated 2014 · Ruislip

12 applications on PlanIndex · across 8 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

8 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

  • 15 - 16 Montagu Mews South London W1H 7ET

    26/03608/ADFULL Submitted 2 Jun 2026 50 yards away

    87% historically approved · decision due ~28 Jul

    Details of all new windows, omission of the rooflight to the front roof slope conservation rooflight and main door pursuant to conditions 4, 5 and 6 of planning permission dated 7th May 2026 (RN:26/00330).

    Awaiting decision Full applications Loft or dormer Windows or glazing 8 docs

  • 26 Montagu Mews South London W1H 7ES

    25/05187/FULL Submitted 25 Jul 2025 50 yards away

    Replacement of garage doors with timber windows.

    Granted Full applications Windows or glazing 14 docs

  • 15 - 16 Montagu Mews South London W1H 7ET

    26/00330/FULL Submitted 20 Jan 2026 50 yards away

    Conversion of the existing ground-floor garage into habitable residential accommodation, replacement of existing windows and doors with double glazing, replacement of existing garage doors with new windows and installation of new rooflights.

    Granted Full applications Loft or dormer Windows or glazing 25 docs

  • 22 Montagu Mews South London W1H 7ES

    04/09799/CAC Submitted 10 Dec 2004 50 yards away

    Demolition of roof, part rear elevation, internal partitions and floors.

    Granted Heritage and listed buildings Demolition 2 docs

  • 22 Montagu Mews South London W1H 7ES

    04/09798/FULL Submitted 10 Dec 2004 50 yards away

    Demolition of roof and replacement with extended roof and infill of rear lightwell.

    Granted Full applications Extension Demolition 9 docs

  • 21 Montagu Mews South London W1H 7ES

    25/09359/FULL Submitted 24 Dec 2025 50 yards away

    87% historically approved · decision due ~21 May

    Infill of existing light well to first floor at the rear, roof alterations including new conservation style roof lights and photovoltaic panels to the rear slope of the roof. Alterations to the front façade including the installation of new double doors with window over and removal metal bar to ground floor windows and installation of double glazed vacuum glazed double glazing within existing window units.

    Awaiting decision Full applications Extension Loft or dormer +2 34 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