Planning application
25/08812/FULL
21 Montagu Street London W1H 7EX
Proposal
Installation of new external vent and timber louvred door in lightwell (21-22 Montagu Street).
As published by the council, reference 25/08812/FULL
Timeline
Dates from the published record
-
4 Dec 2025
Received by Westminster
-
24 Apr 2026
Validated
Checked as complete and ready for consideration.
-
8 Jun 2026
Decision issued: Application Permitted
-
29 Jul 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About full applications applications
How this application type works
A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.
Nearby applications
Within 500 metres
-
25/05187/FULL Granted
26 Montagu Mews South London W1H 7ES
Replacement of garage doors with timber windows.
-
26/03305/FULL Awaiting decision
9 Upper Berkeley Street London W1H 7QA
Installation of a new boosted cold water system within the existing basement vault area, including replacement of the existing vault door with a painted timber louvred door to match existing.
-
26/01939/LBC Awaiting decision
11 Upper Berkeley Street London W1H 7QB
Reconstruction of an existing chimney stack at roof level.
-
25/07709/ADFULL Awaiting decision
3 Brunswick Mews London W1H 7FB
Details of appropriate arrangements to secure measures to mitigate the potential increased demand for on-street residents car parking in the vicinity of the site pursuant to condition 3 of planning permission dated 5th February 2025 (RN:24/08126/FULL)
-
25/07695/ADFULL Awaiting decision
3 Brunswick Mews London W1H 7FB
Details of secure cycle storage for the residential (Class C3) use pursuant to condition 4 of planning permission dated 5th February 2025 (RN:24/08126/FULL)
-
25/09359/FULL Awaiting decision
21 Montagu Mews South London W1H 7ES
Infill of existing light well to first floor at the rear, roof alterations including new conservation style roof lights and photovoltaic panels to the rear slope of the roof. Alterations to the front façade including the installation of new double doors with window over and removal metal bar to ground floor windows and installation of double glazed vacuum glazed double glazing within existing window units.
Other full applications applications
In Westminster
-
26/04824/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Detailed design and specification of new blinds to NZH based on mock-up trials on-site. pursuant to condition 32 (i) of planning permission dated 8th April 2024 (23/00571/FULL).
-
26/04829/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
-
26/04841/ADFULL Granted
29 Henstridge Place London NW8 6QD
Details of the facing materials you will use, including glazing, and elevations and roof plans annotated to show where the materials are to be located pursuant to condition 5 of planning permission dated 18th November 2025 (RN:25/06159).
-
26/04989/FULL Awaiting decision
1 Kildare Terrace London W2 5JT
Erection of a mansard roof extending over the main house and side wing, replacement lower ground rear extension with roof terrace above, lowering of lower ground floor slab, installation of an air source heat pump in rear garden, new front boundary treatment, and new second floor window on the north elevation.
-
26/04986/FULL Awaiting decision
Inver Court Inverness Terrace London W2 6JB
Replacement of combustible materials in the render facades; timber decking and plastic soffits/ fascias to terraces with non-combustible materials on the 5th and 6th floors.