cs:westminster:26/03410/LBCPlanning Application cs:westminster:26/03410/LBC
Heritage application at 17 Hertford Street London W1J 7RS, Westminster. View planning documents, track the decision and get email alerts on updates.
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)
26/03410/LBC
17 Hertford Street London W1J 7RS
This is a heritage application for an extension at 17 Hertford Street London W1J 7RS. Westminster has handled 2,686 applications of this type and approves 90% of them, typically deciding them in 64 days. It was submitted on 22 May 2026 and is still awaiting a decision. The site is in the Mayfair conservation area, with 17 listed buildings nearby. There have been 8 other applications at this address. In the past year there have been 561 applications across West End. We hold 631 applications in total for the W1J postcode area.
Track this application
Get email alerts when there is a planning decision or status change.
Get email alerts near W1J
New planning applications delivered to your inbox weekly.
Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster