Planning application
17 Hertford Street London W1J 7RS
Decided. The decision notice on the council portal carries the outcome in full, including any conditions.
Proposal
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.
As published by the council, reference 26/06165/LBC
Application record
- Reference
- 26/06165/LBC
- Category
- Heritage and listed buildings
- Status
- Decided
- Received
- 9 Sep 2026
- Validated
- 9 Sep 2026
- 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.
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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)
-
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]
-
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)
-
26/03406/ADFULL 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 6 of planning permission dated 13 February 2025 (RN: 24/03931/FULL) [Linked to 26/03484/ADLBC]
-
26/02817/FULL Withdrawn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]
-
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]
-
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)
-
25/07828/LBC Granted
17 Hertford Street London W1J 7RS
Internal reconfigurations, restoration and associated works.
-
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.
-
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.
Timeline
Dates from the published record
-
9 Sep 2026
Received by Westminster
-
15 Sep 2026
Added to PlanIndex
-
30 Sep 2026
Status changed to Decided
Previously Pending.
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 heritage and listed building applications
Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
17 Hertford Street London W1J 7RS
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
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
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
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
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
Internal reconfigurations, restoration and associated works.
Granted Heritage and listed buildings 56 docs
Other heritage and listed building applications
In Westminster
-
26/07529/LBC Awaiting decision
69 Eaton Place London SW1X 8DF
Installation of new cast iron water supply pipe on rear courtyard elevation. (Linked with 26/07528/FULL)
-
26/07509/LBC 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 26/07508/FULL)
-
26/07473/LBC Awaiting decision
Flat 3 82 New Cavendish Street London W1G 9TA
Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07472/FULL)
-
26/07471/LBC Awaiting decision
12 Queen Anne's Gate London SW1H 9AA
Excavation of single-storey basement, internal reconfiguration and installation of modern services. (Linked with 26/07470/FULL)
-
26/07461/LBC Awaiting decision
1 Savile Row London W1S 3JR
Minor internal works comprising redecoration and upgrades to lighting, flooring and bathroom and kitchen facilities, together with external works including new lighting and signage.