Planning application
Halcyon London International School 33 Seymour Place London W1H 5AP
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Detailed drawings (scaled sections and elevations) of the stained-glass light boxes & fixing details pursuant to Condition 3 of listed building consent dated 3rd February 2025 (RN:24/08169/LBC)
As published by the council, reference 25/08138/ADLBC
Application record
- Reference
- 25/08138/ADLBC
- Type
- Approval of Details (ADLBC)
- Status
- Decided
- Decision
- Granted As published: Application Permitted
- Received
- 7 Nov 2025
- Validated
- 7 Nov 2025
- Decided
- 17 Feb 2026
- Ward
- Marylebone
- Decision by
- Delegated Decision
- Postcode
- W1H 5AP
Site history
Applications at this address on the Westminster register
This site has had 2 applications since 2025: 1 approved, 0 refused.
-
26/03579/ADV Decided
Halcyon London International School 33 Seymour Place London W1H 5AP
Display of two non illuminated board signs on railings measuring 1.25m x 5.5m and two non illuminated projecting banner signs measuring 5m x 0.75m.
Timeline
Dates from the published record
-
7 Nov 2025
Received by Westminster
-
17 Feb 2026
Decision issued: Application Permitted
-
20 Jul 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
ADAM Architecture Agent, an architecture practice registered in Winchester
Active · incorporated 1986 · Winchester
90 applications on PlanIndex · across 23 councils · 99% granted
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See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
9 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 17 February 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 condition discharge and variation applications
This application deals with conditions on an existing permission, supplying the details a condition requires or asking to vary or remove one, without reopening the permission itself. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
Halcyon London International School 33 Seymour Place London W1H 5AP
82% historically approved · decision due ~27 Jul
Display of two non illuminated board signs on railings measuring 1.25m x 5.5m and two non illuminated projecting banner signs measuring 5m x 0.75m.
Decided Advertising 7 docs -
34 Upper Berkeley Street London W1H 5QE
Installation of replacement internal and external doors and fencing / gate on Stourcliffe Street. (Linked with 26/00625/FULL)
Granted Heritage and listed buildings 2 docs -
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Installation of replacement external doors and fencing / gate on Stourcliffe Street. (Linked with 26/00626/LBC)
Granted Full applications 7 docs -
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88% historically approved · decision due ~3 Jul
The replacement of three rooflights with two lead clad dormers with full height windows and juliet balcony.
Awaiting decision Full applications Loft or dormer Windows or glazing 10 docs -
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27 Upper Berkeley Street London W1H 7QN
82% historically approved · decision due ~30 Oct
Display of a non illuminated hanging sign measuring 0.41m x 0.41m; two white vinyl lettering applied to the inside of two window panes; and lettering to proposed awning. (Linked with 26/05569/LBC)
Awaiting decision Advertising Windows or glazing 7 docs
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Details of external and internal signage strategy pursuant to Condition 7(E) of listed building consent dated 12th February 2021 (RN: 19/07816/LBC)
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Detailed design and specification of new blinds to NZH based on mock-up trials on-site pursuant to Condition 6(m) of listed building consent dated 12th February 2021 (19/07816/LBC).
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26/04850/ADLBC Awaiting decision
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Detailed drawings of garage doors, roof lantern and any new lighting and flooring in the principal rooms pursuant to condition 6 (iii) (iv) (v) of listed building 18th August 2025 (RN:25/03417/LBC)
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25/07120/ADLBC Granted
72 - 74 Lancaster Gate London W2 3NH
Details of new and altered doors and door architraves, including external faces of lifts (detailed elevations and sections at 1:10) pursuant to Condition 3 (A) of Listed Building Consent dated 14 December 2023 (RN: 23/00772/LBC) (Linked app: 25/07088/ADFULL)