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Planning application

Flat 2 New Cavendish Mansions 48 New Cavendish Street London W1G 8TG

Awaiting decision Westminster 26/00872/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

Retrofit of existing windows, including insertion of slimline double-glazing windowpanes to front facade.

As published by the council, reference 26/00872/FULL

Application record

Reference
26/00872/FULL
Type
Full Planning Permission Application
Status
Pending
Received
12 Feb 2026
Validated
12 Feb 2026
Ward
Marylebone
Postcode
W1G 8TG

Timeline

Dates from the published record

  1. 12 Feb 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 9 April 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

Howard de Walden Estates Limited Agent, a developer registered in London

Active · incorporated 1963 · London

37 applications on PlanIndex · 91% 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

13 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

  • 2 Marylebone Mews London W1G 8PU

    12/10824/ADFULL Submitted 30 Oct 2012 50 yards away

    Approval of details pursuant to Conditions 5 and 6 of planning permission dated 3 November 2011; namely for a sample of obscure glazing, detailed drawings of glass screen for windows and second floor terrace and detailed drawings of new windows and doors

    Granted Full applications Windows or glazing 5 docs

  • 45 New Cavendish Street London W1G 9TJ

    25/07902/LBC Submitted 31 Oct 2025 50 yards away

    Internal alterations at ground and lower ground level including reinstatement of staircase. (Linked with 25/07901/FULL)

    Granted Heritage and listed buildings 11 docs

  • 45 New Cavendish Street London W1G 9TJ

    25/07901/FULL Submitted 31 Oct 2025 50 yards away

    Use of part of the lower ground floor for retail purposes (Class E). (Linked with 25/07902/LBC)

    Granted Full applications 16 docs

  • Hahnemann House 32 Welbeck Street London W1G 8EU

    26/03230/LBC Submitted 15 May 2026 50 yards away

    90% historically approved · decision due ~10 Jul

    Alteration and improvement of existing heating and cooling to the Chapel through reinstatement of a working fan to dome, installation of fan coil units and an associated air source heat pump, removal of existing wall heating panels, and opening of fixed windows. (Linked to 26/03229/FULL)

    Awaiting decision Heritage and listed buildings Windows or glazing 12 docs

  • Hahnemann House 32 Welbeck Street London W1G 8EU

    26/03229/FULL Submitted 15 May 2026 50 yards away

    88% historically approved · decision due ~10 Jul

    Alteration and improvement of existing heating and cooling to the Chapel through reinstatement of a working fan to dome, installation of fan coil units and an associated air source heat pump, removal of existing wall heating panels, and opening of fixed windows. (Linked to 26/03230/LBC)

    Awaiting decision Full applications Windows or glazing 12 docs

  • 62 Wimpole Street London W1G 8AJ

    26/06523/FULL Submitted 23 Sep 2026 50 yards away

    88% historically approved · decision due ~18 Nov

    Alterations to the existing building to provide minor reconfiguration of plan form at lower ground, replacement and installation of external plant, installation of medi-sinks and WC, installation of secondary glazing, drylining and replacement of existing heating. (Linked to 26/06524/LBC)

    Decided Full applications Windows or glazing

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