26/02818/LBCPlanning Application 26/02818/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 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]
26/02818/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 28 April 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.
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Application Details
Applicant & Agent
Planning Application Dates
Planning Decision
Publicity
Appeal
Additional Information
Source: Westminster