Planning application
25/08056/LBC
21 Upper Montagu Street London W1H 2PQ
Proposal
Replacement of existing non-original single-glazed timber sash windows with new slimline double-glazed timber sash windows to match the original in appearance, detailing and materials. (Linked to 25/08055/FULL)
As published by the council, reference 25/08056/LBC
Timeline
Dates from the published record
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5 Nov 2025
Received by Westminster
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20 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 heritage and listed buildings applications
How this application type works
Heritage applications concern listed buildings and conservation areas. Listed building consent is needed for works, inside or out, that affect the special interest of a listed building, and carrying out such works without consent is a criminal offence. The council weighs harm to the heritage asset against any public benefit of the proposal.
More on heritage and listed buildings applications in our guide
Nearby applications
Within 500 metres
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25/08055/FULL Awaiting decision
21 Upper Montagu Street London W1H 2PQ
Replacement of single-glazed timber sash windows with slimline double-glazed timber sash windows to match the original in appearance, detailing and materials. (Linked to 25/08056/LBC)
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25/06220/FULL Withdrawn
21 Upper Montagu Street London W1H 2PQ
Careful dismantling and rebuilding of bowed flank elevation in matching/reused brickwork and replacement of existing timber joists to third floor. (Linked with 25/06221/LBC)
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25/06221/LBC Withdrawn
21 Upper Montagu Street London W1H 2PQ
Careful dismantling and rebuilding of bowed flank elevation in matching/reused brickwork and replacement of existing timber joists to third floor. (Linked with 25/06220/FULL)
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25/07009/TELNOT Decided
105A Crawford Street London W1H 2HU
Regulation 5 Notice of Intention to Install Fixed Line Broadband Apparatus to a Listed Building.
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25/07358/FULL Awaiting decision
25 Upper Montagu Street London W1H 1SA
Replacement of existing external staircase within front lightwell. (Linked to 25/08299/LBC)
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25/08299/LBC Awaiting decision
25 Upper Montagu Street London W1H 1SA
Replacement of existing external staircase within front lightwell. (Linked to 25/07358/FULL)
Other heritage and listed buildings applications
In Westminster
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26/04984/LBC Awaiting decision
47G Randolph Avenue London W9 1BQ
Installation of replacement fire surround.
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26/04997/LBC Awaiting decision
Hanover Lodge Outer Circle Regent's Park London NW1 4HB
Erection of a morning room side extension. (Linked to 26/04996/FULL)
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26/04979/LBC Awaiting decision
12 Brewer Street London W1F 0SF
Internal alterations including removal of internal enclosures; Replacement flooring, shelving and slatwall systems, staircase handrail repair and other associated joinery works.
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26/04987/LBC Awaiting decision
Basement And Ground Floor 8 Ganton Street London W1F 7QL
Repainting of the existing timber shopfront, hand-painted fascia lettering, installation of a new hanging sign using the existing projecting sign bracket, and installation of a discreet fascia-mounted LED trough light.
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26/04995/LBC Awaiting decision
Hanover Lodge Outer Circle Regent's Park London NW1 4HB
Erection of rear conservatory extensions and an entrance loggia to side with roof terrace above, together with associated landscaping and alterations. (Linked with 26/04994/FULL)