18 Seymour Street London W1H 7HU Data via plota.co.uk
Proposal
Detailed drawings of all new windows, also design of the re-covering of front entrance steps and replacement stairs to the front lightwell, including retention of the top stone step; pursuant to condition 5 and 6 of planning permission dated 8th August 2023 (RN ) Data via plota.co.uk
Application progress
Approved on 15 Jul 2025 · Delegated Decision · Last checked 19 Oct 2026
Documents 8
Decision & officer reports 2
Plans & drawings 1
Application forms 1
Associated applications 2
Part of
Conditions 5, 6 discharged
- ConditionsDetailed drawings of all new windows, also design of the re-covering of front entrance steps…This application25/04494/ADFULL
Site constraints 12
Show the other 21 with distances
- 3 m1, New Quebec Street W1Grade II
- 21 m4, New Quebec Street W1Grade II
- 22 m22-36, Seymour Street W1Grade II
- 22 m21-25, New Quebec Street W1Grade II
- 25 m11-19, SEYMOUR STREET W1 (See details for further address information)Grade II
- 43 m7, New Quebec Street W1Grade II
- 49 m14-19, New Quebec Street W1Grade II
- 53 mChurch of the AnnuciationGrade II*
- 55 mWestern Marble Arch Synagogue (1 Wallenberg Place and 13 Quebec Mews), 24 Great Cumberland Place and 38 Seymour Street, with area railings, and standard lanterns to 38 Seymour StreetGrade II
- 64 mNorthern Part of Mostyn HotelGrade II
- 67 mMarylebone War MemorialGrade II
- 76 m66-69, Upper Berkeley Street W1Grade II
- 80 mThe Montcalm Hotel (2 Wallenberg Place) and 42 Great Cumberland Place, with area railingsGrade II
- 111 m11 and 12, Upper Berkeley Street W1Grade II
- 126 m13 to 15, Upper Berkeley Street W1Grade II
- 127 m10, Portman Street W1Grade II
- 137 m16, Upper Berkeley Street W1Grade II
- 140 m35A, GREAT CUMBERLAND PLACE W1 (See details for further address information)Grade II
- 143 mRoyal Intitute of British Architects Drawings CollectionGrade I
- 144 mVad Ladies ClubGrade II
- 148 m20, Montagu Street W1Grade II
Checked on 1 November 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Building
From the energy performance certificate lodged in August 2026, the latest held for this property. The building may have changed since. View the certificate
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Important details
- Council
- Westminster
- Application type
- Approval of Details (Full PP)
- Postcode
- W1H 7HU
- Received
- 1 Jul 2025
- Validated
- 1 Jul 2025
- Ward
- Marylebone
- Case officer
- Show
- Target decision
- 26 Aug 2025
- Decision
- Application Permitted
- Decision date
- 15 Jul 2025
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Latitude Architects
How this decision compares
Decided in 14 days from validation, 23 days faster than Westminster's median of 37 for discharge of conditions. Approved, as 91% of discharge of conditions here are.
Plota live figures for discharge of conditions decided by Westminster in the last twelve months, from validation. Westminster decision record →
Public comments
No public comments yet.
Last counted 19 Oct 2026
Consultation & key dates
- Alt. reference
- PP-14141587
- Planning Portal ref
- PP-14141587
- Env. assessment
- No
Historical activity at this location
34 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
Westminster is slower than most councils at deciding householder applications, ranking #258 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Westminster is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.
Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.
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18 Seymour Street London W1H 7HU
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Referenced application
Council archive
18 Seymour Street London W1H 7HU
Installation of 4 x heat pump units and photovoltaic panels at roof level, single storey extension to rear ground floor, re-construction of existing wc closet extension at mid first/second floor level, replacement of existing window sashes with double glazed timber sashes, external repairs to building and associated works, all in connection with continued office use.
- Received
- 6 Apr 2023
- Decided
- 8 Aug 2023
- Outcome
- Approved