Planning application
25/09082/FULL
20A Seymour Street London W1H 7HX
Proposal
Installation of replacement sash windows and a replacement skylight within a smaller opening. [Linked with 25/09083/LBC].
As published by the council, reference 25/09082/FULL
Timeline
Dates from the published record
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16 Dec 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 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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25/09083/LBC Awaiting decision
20A Seymour Street London W1H 7HX
Installation of replacement sash windows and a replacement skylight within a smaller opening. [Linked with 25/09082/FULL]
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25/05696/LBC Granted
Flat 3 20A Seymour Street London W1H 7HX
Layout changes including increasing size of bedroom, relocate bathroom door to create an en-suite, increase size of kitchen and divide box room to the lower floor to create a guest WC and Utility room.
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25/07016/LBC Awaiting decision
1 New Quebec Street London W1H 7DD
Installation of secondary glazing, installation of kitchenette to ground floor, waterproofing works to underpavement vault.
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25/06157/LBC Awaiting decision
18 Seymour Street London W1H 7HU
Repair strategy for the preservation of existing ceilings
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26/03007/ADLBC Awaiting decision
18 Seymour Street London W1H 7HU
Details of the repairs and upgrading of the rear oriel window pursuant to condition 5 of listed building consent dated 8th August 2023 (RN:23/02367).
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26/01286/ADLBC Awaiting decision
18 Seymour Street London W1H 7HU
Details of vaults waterproofing method pursuant to Condition 7 of listed building consent dated 8 August 2023 (RN: 23/02367/LBC)
Other full applications applications
In Westminster
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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).
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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)
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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).
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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.