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Planning application

17 Hertford Street London W1J 7RS

Decided Westminster 26/03406/ADFULL

Works: Loft or dormer Windows or glazing

Decided. The decision notice on the council portal carries the outcome in full, including any conditions.

Proposal

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]

As published by the council, reference 26/03406/ADFULL

Application record

Reference
26/03406/ADFULL
Status
Decided
Received
22 May 2026
Validated
8 Jun 2026
Ward
West End
Postcode
W1J 7RS

Site history

Applications at this address on the Westminster register

This site has had 11 applications since 2007: 3 approved, 0 refused.

  • 26/06165/LBC Decided

    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 Decided

    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
  • 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
  • 26/02817/FULL Withdrawn

    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
  • 25/07827/FULL Withdrawn

    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 25/07828/LBC)

    Decided 26 Feb 2026 Full applications
  • 25/07828/LBC Granted

    17 Hertford Street London W1J 7RS

    Internal reconfigurations, restoration and associated works.

    Decided 31 Mar 2026 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. 22 May 2026

    Received by Westminster

  2. 8 Jun 2026

    Validated

    Checked as complete and ready for consideration.

  3. 21 Jul 2026

    Added to PlanIndex

  4. 29 Sep 2026

    Status changed to Decided

    Previously Pending.

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

After the decision

Westminster has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

About this record

The published feed does not state which type of application this is; the register entry on Westminster's portal will say. Our guide explains the common types.

Nearby applications

Within 0.3 miles

  • 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

    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

  • 17 Hertford Street London W1J 7RS

    07/01339/FULL Submitted 12 Feb 2007 50 yards away

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

    Granted Full applications Loft or dormer 14 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

  • 17 Hertford Street London W1J 7RS

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

    Internal reconfigurations, restoration and associated works.

    Granted Heritage and listed buildings 56 docs