Planning application
26/04418/FULL
Flat 2 5 Montagu Square London W1H 2LA
Proposal
Installation of secondary glazing to existing historic single glazed timber windows. Replacement of existing window with new timber double glazed unit. (Linked with 26/04419/LBC)
As published by the council, reference 26/04418/FULL
Timeline
Dates from the published record
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3 Jul 2026
Received by Westminster
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21 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Westminster for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
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
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26/04419/LBC Awaiting decision
Flat 2 5 Montagu Square London W1H 2LA
Installation of secondary glazing to existing historic single glazed timber windows. Replacement of existing window with new timber double glazed unit. (Linked with 26/04418/FULL)
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25/06633/FULL Granted
1 Gloucester Place Mews London W1U 8BA
Removal of the existing asphalt flat roof at first floor level and installation of a ventilated lead roof with other associated works.
-
26/01123/LBC Awaiting decision
8 Montagu Square London W1H 2LB
Refurbishment works to the main roof including new roof slates, tapered lead valley gutters and new lead roof covering to existing dormer and refurbishment of lead box gutter on the rear elevation.
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25/06616/LBC Granted
1 Montagu Square London W1H 2LA
Installation of a replacement Portland stone step to match existing. Installation of reinforcing bars to horizontal mortar beds at basement and ground floor levels.
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26/02601/LBC Awaiting decision
29 Gloucester Place London W1U 8HT
Installation of lightweight metal stud partitions finished with plasterboard and a skim coat to 2nd , 3rd and 4th floor offices.
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26/03815/FULL Awaiting decision
Flat 4 39 Gloucester Place London W1U 8JB
Replacement of existing roof access hatch with access rooflight and associated remedial works.
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26/04829/ADFULL Granted
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Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
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26/04841/ADFULL Granted
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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).
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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.
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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.