25/06412/FULLPlanning Application 25/06412/FULL

Full application at 9 Mansfield Street London W1G 9NZ, Westminster. View planning documents, track the decision and get email alerts on updates.

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Change of Use from office (Class E) to residential (Use Class C3), refurbishment and reconfiguration of parts of the buildings and sympathetic conservation repairs, removal of distracting features and reinstatement of historic detailing in rooms of high significance, alterations to external windows, installation of new lift, basement damp proofing works and fitout works through out to facilitate reinstatement back to original residential use, including associated works. (Linked to 25/06413/LBC)

25/06412/FULL

Large

Full

9 Mansfield Street London W1G 9NZ

SubmittedSubmitted8 Sept

ValidatedValidated

ConsultationConsultation

TargetTarget Date

DecidedDecided

7 weeks typical decision time in Westminster84% of full applications approved

This is a full planning application for a change of use at 9 Mansfield Street London W1G 9NZ. Westminster has handled 4,496 applications of this type and approves 84% of them, typically deciding them in 73 days. It was submitted on 8 September 2025 and is still awaiting a decision. The site is in the Harley Street conservation area, with 20 listed buildings nearby. There have been 2 other applications at this address. In the past year there have been 221 applications across Marylebone. We hold 303 applications in total for the W1G postcode area.