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Planning application

17 Hertford Street London W1J 7RS

Awaiting decision Westminster 25/07827/FULL Full Planning Permission Application

Works: Loft or dormer Windows or glazing

Relates to 25/07828/LBC

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

Proposal

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)

As published by the council, reference 25/07827/FULL

Application record

Reference
25/07827/FULL
Type
Full Planning Permission Application
Status
Pending
Received
29 Oct 2025
Validated
6 Nov 2025
Ward
West End
Postcode
W1J 7RS

Site history

Applications at this address on the Westminster register

This site has had 11 applications since 2007: 2 approved, 0 refused.

  • 26/06165/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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.

    Submitted 9 Sep 2026 Heritage and listed buildings
  • 26/03409/FULL Awaiting decision

    17 Hertford Street London W1J 7RS

    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)

    Submitted 22 May 2026 Full applications
  • 26/03484/ADLBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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]

    Submitted 22 May 2026 Conditions
  • 26/03410/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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)

    Submitted 22 May 2026 Heritage and listed buildings
  • 26/03406/ADFULL Awaiting decision

    17 Hertford Street London W1J 7RS

    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]

    Submitted 22 May 2026 Full applications
  • 26/02817/FULL Awaiting decision

    17 Hertford Street London W1J 7RS

    Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard extension, infill of existing lightwell and repositioning of skylight above stairwell. [Linked to 26/02818/LBC]

    Submitted 28 Apr 2026 Full applications
  • 26/02818/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard extension, infill of existing lightwell and repositioning of skylight above stairwell. [Linked to 26/02817/FULL]

    Submitted 28 Apr 2026 Heritage and listed buildings
  • 25/07828/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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)

    Submitted 29 Oct 2025 Heritage and listed buildings
  • 07/01340/LBC Granted

    17 Hertford Street London W1J 7RS

    Installation of nine air-conditioning units at roof level and replacement of roof access enclosure and rooflight; installation of associated internal units and pipework.

    Decided 3 Jul 2008 Heritage and listed buildings
  • 07/01339/FULL Granted

    17 Hertford Street London W1J 7RS

    Installation of nine air-conditioning units at roof level and replacement of roof access enclosure and rooflight.

    Decided 3 Jul 2008 Full applications

Timeline

Dates from the published record

  1. 29 Oct 2025

    Received by Westminster

  2. 6 Nov 2025

    Validated

    Checked as complete and ready for consideration.

  3. 21 Jul 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 1 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 66 days over the applications it decided in the last year.

Cases linked to this one on the register

  • 25/07828/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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)

    Submitted 29 Oct 2025 Heritage and listed buildings

1 later application on the register refers to this one:

  • 25/07828/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    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)

    Submitted 29 Oct 2025 Heritage and listed buildings

Who's behind it

Company information only, from the register and Companies House

Arya Douge Agent, registered in London

Active · incorporated 2021 · London

17 applications on PlanIndex · across 3 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

31 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

  • 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

  • 17 Hertford Street London W1J 7RS

    26/02817/FULL Submitted 28 Apr 2026 50 yards away

    87% historically approved · decision due ~23 Jun

    Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard extension, infill of existing lightwell and repositioning of skylight above stairwell. [Linked to 26/02818/LBC]

    Awaiting decision Full applications Extension Loft or dormer +1 1 doc

  • 17 Hertford Street London W1J 7RS

    26/02818/LBC Submitted 28 Apr 2026 50 yards away

    90% historically approved · decision due ~23 Jun

    Replacement of non-original casement windows at Level 03 with timber sash windows; new structure for mansard extension, infill of existing lightwell and repositioning of skylight above stairwell. [Linked to 26/02817/FULL]

    Awaiting decision Heritage and listed buildings Extension Loft or dormer +1 1 doc

  • 17 Hertford Street London W1J 7RS

    07/01340/LBC Submitted 12 Feb 2007 50 yards away

    Installation of nine air-conditioning units at roof level and replacement of roof access enclosure and rooflight; installation of associated internal units and pipework.

    Granted Heritage and listed buildings Loft or dormer 2 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