Planning application
51 Upper Montagu Street London W1H 1FQ
Relates to 25/03874/FULL
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Details of Desktop study and Site investigation reports pursuant to partial discharge of Condition 11 (Phase 2 and Phase 3) of planning permission dated 24th October 2025 (RN: 25/03874/FULL).
As published by the council, reference 26/06443/ADFULL
Application record
- Reference
- 26/06443/ADFULL
- Status
- Pending
- Received
- 21 Sep 2026
- Validated
- 21 Sep 2026
- Postcode
- W1H 1FQ
Site history
Applications at this address on the Westminster register
This site has had 6 applications since 2025: 3 approved, 0 refused.
-
26/07161/LBC Awaiting decision
51 Upper Montagu Street London W1H 1FQ
Internal alterations to include additional floor lowering within the lower ground floor WC to match the consented level of the other rooms.
-
26/00898/ADFULL Awaiting decision
51 Upper Montagu Street London W1H 1FQ
Details of supplementary acoustic report, detailed drawings of all new doors and windows, new first floor balconettes and investigative report of Phase 1 pursuant to condition 5, 7, 8 and 11 (part) of planning permission dated 24 October 2025 (RN: 25/03874/FULL).
-
26/00814/ADLBC Granted
51 Upper Montagu Street London W1H 1FQ
Detailed drawings of new doors, new windows including sections and glazing bar profiles, new skirting, and cornices, new fireplace surrounds, new Juliette balconies pursuant to condition 4 of listed building consent dated 28 October 2025 (RN: 25/03875/LBC)
-
25/03875/LBC Granted
51 Upper Montagu Street London W1H 1FQ
Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.
-
25/03874/FULL Granted
51 Upper Montagu Street London W1H 1FQ
Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.
Timeline
Dates from the published record
-
21 Sep 2026
Received by Westminster
-
23 Sep 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 16 November 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Westminster took a median of 86 days over the applications it decided in the last year.
Related applications
Cases linked to this one on the register
-
25/03874/FULL Granted
51 Upper Montagu Street London W1H 1FQ
Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.
What happens while it is decided
This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster's median decision took 86 days. More in our guide to how long planning decisions take.
About this record
The published feed does not state which type of application this is; the register entry on Westminster's portal will say. Our guide explains the common types.
Nearby applications
Within 0.3 miles
-
51 Upper Montagu Street London W1H 1FQ
90% historically approved · decision due ~18 Dec
Internal alterations to include additional floor lowering within the lower ground floor WC to match the consented level of the other rooms.
Awaiting decision Heritage and listed buildings -
51 Upper Montagu Street London W1H 1FQ
88% historically approved · decision due ~9 Apr
Details of supplementary acoustic report, detailed drawings of all new doors and windows, new first floor balconettes and investigative report of Phase 1 pursuant to condition 5, 7, 8 and 11 (part) of planning permission dated 24 October 2025 (RN: 25/03874/FULL).
Awaiting decision Full applications Windows or glazing 11 docs -
51 Upper Montagu Street London W1H 1FQ
Detailed drawings of new doors, new windows including sections and glazing bar profiles, new skirting, and cornices, new fireplace surrounds, new Juliette balconies pursuant to condition 4 of listed building consent dated 28 October 2025 (RN: 25/03875/LBC)
Granted Conditions Windows or glazing 12 docs -
51 Upper Montagu Street London W1H 1FQ
Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.
Granted Heritage and listed buildings Extension Windows or glazing 37 docs -
51 Upper Montagu Street London W1H 1FQ
Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.
Granted Full applications Extension Windows or glazing 36 docs -
53 Upper Montagu Street London W1H 1SE
Details of the height and finished appearance of the new openings at ground and second floor levels, and proposed remedial works required to address damp following inspection works pursuant to Condition 2 (parts i and ii) of the listed building consent dated 2 January 2025 (RN: 24/05972/LBC)
Granted Conditions 8 docs