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Planning application

20 Hertford Street London W1J 7RX

Awaiting decision Westminster 25/08753/FULL Full Planning Permission Application

Works: Extension 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

Rear extension at fourth floor, installation of new double glazed sliding doors to existing terrace; internal layout amendments; alteration of the existing terrace rooflight, installation of automatic opening vent (AOV) and installation of two new rooflights on main roof.

As published by the council, reference 25/08753/FULL

Application record

Reference
25/08753/FULL
Type
Full Planning Permission Application
Status
Pending
Received
2 Dec 2025
Validated
2 Dec 2025
Ward
West End
Postcode
W1J 7RX

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2025.

  • 26/00932/FULL Awaiting decision

    20 Hertford Street London W1J 7RX

    Replacement of existing timber-framed windows with new traditionally detailed timber windows matching the existing openings in size and opening style. Minor internal alterations to lower ground floor level, including the replacement of an existing window with a traditional door into the lightwell.

    Submitted 13 Feb 2026 Full applications
  • 25/08992/CLOPUD Withdrawn

    20 Hertford Street London W1J 7RX

    Replacement of existing timber-framed windows with new traditionally detailed timber windows matching the existing openings in size and opening style, with a traditional glazing style.

    Decided 7 Mar 2026 Lawful development

Timeline

Dates from the published record

  1. 2 Dec 2025

    Received by Westminster

  2. 20 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 27 January 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

Echlin Studio Ltd Agent, registered in London

Active · incorporated 2019 · London

3 applications on PlanIndex

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See their track record

Documents

Plans, drawings, consultee responses and the officer's report

30 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.

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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

  • 20 Hertford Street London W1J 7RX

    25/08992/CLOPUD Submitted 11 Dec 2025 50 yards away

    Replacement of existing timber-framed windows with new traditionally detailed timber windows matching the existing openings in size and opening style, with a traditional glazing style.

    Withdrawn Lawful development Windows or glazing 32 docs

  • 20 Hertford Street London W1J 7RX

    26/00932/FULL Submitted 13 Feb 2026 50 yards away

    88% historically approved · decision due ~10 Apr

    Replacement of existing timber-framed windows with new traditionally detailed timber windows matching the existing openings in size and opening style. Minor internal alterations to lower ground floor level, including the replacement of an existing window with a traditional door into the lightwell.

    Awaiting decision Full applications Windows or glazing 38 docs

  • 17 Hertford Street London W1J 7RS

    26/06165/LBC Submitted 9 Sep 2026 50 yards away

    90% historically approved · decision due ~4 Nov

    Internal alterations to the basement including new lightweight timber-stud partitions to reorganise the existing basement layout; Installation of new sanitaryware in a newly configured bathroom; Replacement of modern kitchen fittings; and Installation of traditional four-panel timber doors, architraves and ironmongery designed to match existing doors.

    Decided Heritage and listed buildings

  • 17 Hertford Street London W1J 7RS

    26/03484/ADLBC Submitted 22 May 2026 50 yards away

    89% historically approved · decision due ~3 Aug

    Details of all new windows / reduction in size of dormer windows / facing materials pursuant to conditions 4, 5 and 7 of listed building consent dated 13 February 2025 (RN: 24/03932/LBC) [Linked to 26/03406/ADFULL]

    Decided Loft or dormer Windows or glazing 8 docs

  • 17 Hertford Street London W1J 7RS

    26/03406/ADFULL Submitted 22 May 2026 50 yards away

    89% historically approved · decision due ~3 Aug

    Details of all new windows / reduction in size of dormer windows / facing materials pursuant to conditions 4, 5 and 6 of planning permission dated 13 February 2025 (RN: 24/03931/FULL) [Linked to 26/03484/ADLBC]

    Decided Loft or dormer Windows or glazing 8 docs

  • 17 Hertford Street London W1J 7RS

    25/07827/FULL Submitted 29 Oct 2025 50 yards away

    Addition of a fourth-floor mansard roof to allow for the creation of a one-bedroom apartment for short term letting purposes, replacement of windows at third floor level, internal and external restoration, redecoration and minor reconfigurations and other associated works. (Linked 25/07828/LBC)

    Withdrawn Full applications Loft or dormer Windows or glazing 37 docs

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