Planning application
21 Upper Montagu Street London W1H 2PQ
Works: Windows or glazing
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
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)
As published by the council, reference 25/08055/FULL
Application record
- Reference
- 25/08055/FULL
- Type
- Full Planning Permission Application
- Status
- Decided
- Decision
- Granted As published: Application Permitted
- Received
- 5 Nov 2025
- Validated
- 19 Nov 2025
- Decided
- 24 Mar 2026
- Ward
- Marylebone
- Decision by
- Delegated Decision
- Postcode
- W1H 2PQ
Site history
Applications at this address on the Westminster register
This site has had 4 applications since 2025: 2 approved, 0 refused.
-
25/08056/LBC Granted
21 Upper Montagu Street London W1H 2PQ
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)
-
25/06220/FULL Withdrawn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)
-
25/06221/LBC Withdrawn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)
Timeline
Dates from the published record
-
5 Nov 2025
Received by Westminster
-
19 Nov 2025
Validated
Checked as complete and ready for consideration.
-
24 Mar 2026
Decision issued: Application Permitted
-
21 Jul 2026
Added to PlanIndex
Related applications
Cases linked to this one on the register
1 later application on the register refers to this one:
-
25/08056/LBC Granted
21 Upper Montagu Street London W1H 2PQ
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)
Who's behind it
Company information only, from the register and Companies House
Studio Hale Agent, registered in London
Active · incorporated 2023 · London
9 applications on PlanIndex · across 2 councils
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
12 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
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Open the documentsWhat this grant of permission means
Westminster granted permission on 24 March 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About full applications
A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.
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21 Upper Montagu Street London W1H 2PQ
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)
Granted Heritage and listed buildings Windows or glazing 18 docs -
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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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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