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Planning application

20 Hertford Street London W1J 7RX

Awaiting decision Westminster 26/00932/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

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.

As published by the council, reference 26/00932/FULL

Application record

Reference
26/00932/FULL
Type
Full Planning Permission Application
Status
Pending
Received
13 Feb 2026
Validated
13 Feb 2026
Ward
West End
Postcode
W1J 7RX

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2025.

  • 25/08992/CLOPUD Withdrawn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
  • 25/08753/FULL Awaiting decision

    20 Hertford Street London W1J 7RX

    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.

    Submitted 2 Dec 2025 Full applications

Timeline

Dates from the published record

  1. 13 Feb 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 10 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 66 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

38 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 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

  • 20 Hertford Street London W1J 7RX

    25/08753/FULL Submitted 2 Dec 2025 50 yards away

    87% historically approved · decision due ~27 Jan

    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.

    Awaiting decision Full applications Extension Loft or dormer +1 30 docs

  • 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

  • 17 Hertford Street London W1J 7RS

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

    87% historically approved · decision due ~1 Jan

    Internal restoration, redecoration and minor reconfigurations associated with the implementation of planning permission (24-03931-FULL) and listed building permission (24-03932-LBC); addition of a fourth-floor mansard roof to allow for the creation of a one-bedroom apartment for short term letting purposes; replacement of existing windows at third floor level with traditional timber sashes and other associated works. (Linked 25/07828/LBC)

    Awaiting decision Full applications Loft or dormer Windows or glazing 31 docs

  • 17 Hertford Street London W1J 7RS

    25/07828/LBC Submitted 29 Oct 2025 50 yards away

    90% historically approved · decision due ~1 Jan

    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 with 25/07827/FULL)

    Awaiting decision Heritage and listed buildings Loft or dormer Windows or glazing 32 docs

  • 17 Hertford Street London W1J 7RS

    26/03409/FULL Submitted 22 May 2026 50 yards away

    87% historically approved · decision due ~6 Aug

    Replacement of the mansard infill extension to the south east of the property by extending the existing bay upwards by a single storey (3-storeys total) and associated roof works to improve the internal space. (Linked with 26/03410/LBC)

    Awaiting decision Full applications Extension Loft or dormer 32 docs
    Small domestic

  • 17 Hertford Street London W1J 7RS

    26/03410/LBC Submitted 22 May 2026 50 yards away

    90% historically approved · decision due ~6 Aug

    Replacement of the mansard infill extension to the south east of the property by extending the existing bay upwards by a single storey (3-storeys total) and associated roof works to improve the internal space. (Linked with 26/03409/FULL)

    Awaiting decision Heritage and listed buildings Extension Loft or dormer 28 docs
    Small domestic

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