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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 91 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

13 applications on PlanIndex · across 9 councils · 80% 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

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 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

  • 15 - 16 Montagu Mews South London W1H 7ET

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

    88% 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

  • 19 Montagu Street London W1H 7EX

    26/07053/TCA Submitted 15 Oct 2026 50 yards away

    100% historically approved · decision due ~10 Dec

    (T1) - Cherry(Prunus) -reduce crown by 25%(2.5m max) to suitable growth points -prune lateral branches to match, shape and tidy -crown lift removing 3x lowest branches back to main trunk collar All works are for routine maintenance.

    Awaiting decision Trees

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