25/09343/LBCPlanning Application 25/09343/LBC

Heritage application at 56 Upper Montagu Street London W1H 1SN, Westminster. View planning documents, track the decision and get email alerts on updates.

Enriching application data

2/3

Council recordsAppealsFlood risk

Pending Decision

Loading…

Use of ground floor and mezzanine levels to rear as residential (Class C3) use; deconversion of ground floor and mezzanine levels to rear together with two studio flats and one one-bedroom flat to form one three-bedroom maisonette; creation of reconfigured office unit in basement; replacement of all but one window with slimline timber double glazed units installation of secondary glazing to one window; renovation of shopfront; reinstatement of glazed fanlight with opening vent, new solid panel door, and awning; new glazed doors to south elevation of mezzanine garden room; new metal balustrading across rear boundary and raised terrace surface level with walk-on roof lights; replacement of concrete roof tiles with slate and new glazed roof light/ roof access; creation of green roof above mezzanine garden room; removal of modern partition walls and reinstatement of historical plan form as far as possible; reinstatement of historic period features all in connection with the use of building as office at part basement level with the remainder of the building being used as a single residential unit (Class C3) and associated internal alterations. (Linked to 25/09342/FULL)

25/09343/LBC

Small

Heritage

56 Upper Montagu Street London W1H 1SN

SubmittedSubmitted24 Dec

ValidatedValidated

ConsultationConsultation

TargetTarget Date

DecidedDecided

7 weeks typical decision time in Westminster90% of heritage applications approved

This is a heritage application for an outbuilding at 56 Upper Montagu Street London W1H 1SN. Westminster has handled 2,686 applications of this type and approves 90% of them, typically deciding them in 64 days. It was submitted on 24 December 2025 and is still awaiting a decision. The site is in the Portman Estate 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 686 applications in total for the W1H postcode area.