18 Seymour Street London W1H 7HU Data via plota.co.uk
26/03007/ADLBC - Approval of Details (ADLBC)
Approved
Proposal
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). Data via plota.co.uk
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Application progress
✓
Received
7 May 2026
✓
Approved
2 Jun 2026
Approved on 2 Jun 2026 · Delegated Decision · Last checked 7 Jul 2026
Documents 13
Decision & officer reports 2
Plans & drawings 6
PDF
PROPOSED REAR EXTENSION-SECTION AA
Drawing · 7 May 2026
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PDF
PROPOSED REAR EXTENSION-ROOF PLAN
Drawing · 7 May 2026
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PDF
TYPICAL ROOF DETAILS
Drawing · 7 May 2026
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PDF
EXISTING ORIEL WINDOW
Drawing · 7 May 2026
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PDF
EXISTING ORIEL WINDOW
Drawing · 7 May 2026
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PDF
LOCATION PLAN
Drawing · 7 May 2026
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Application forms 1
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Important details
- Council
- Westminster
- Application type
- Approval of Details (ADLBC)
- Postcode
- W1H 7HU
- Received
- 7 May 2026
- Validated
- 7 May 2026
- Ward
- Marylebone
- Case officer
- Track to view
- Target decision
- 2 Jul 2026
- Decision
- Application Permitted
- Decision date
- 2 Jun 2026
- Decision level
- Delegated Decision
- Applicant
- Track to view
- Agent
- Latitude Architects
Consultation & key dates
- Alt. reference
- PP-14914898
- Env. assessment
- No
Historical activity at this location
35 previous applications on record - archival context, not part of the live application.
This property
Previous applications at this address
2025
Details of method of waterproofing of the vaults pursuant to condition 7 of planning perm…
2025
Repair strategy for the preservation of existing ceilings
2025
Approved
Details of a door schedule including photo and location of each door pursuant to conditio…
2025
Approved
Detailed drawings of all new windows, also design of the re-covering of front entrance st…
2025
Approved
Internal alterations at third floor level.
2025
Approved
Details of the detail design, size and location of the new fire surrounds, ceiling roses…
2024
Approved
Amendments to planning permission dated 08 August 2023 (RN: 23/02366/FULL) for, 'Installa…
2024
Approved
Relocation of WC within the reconstructed closet extension at middle, first and second fl…
2023
Approved
Installation of 4 x heat pump units and photovoltaic panels at roof level, single storey…
2023
Approved
Internal alterations at all levels to accommodate office refurbishment, installation of 4…
Within ~100m
Nearby activity
2025
4 Bryanston Street London W1H 7BY
Installation of replacement plant equipment. (Linked to 25/07843/FULL)
2025
4 Bryanston Street London W1H 7BY
Installation of replacement plant equipment. (Linked to 25/07844/LBC)
2025
Basement And Ground Floor 67 Upper Berkeley Street London W1H 7QX
Display for a temporary period of six months of a non-illuminated estate agent board loca…
2025
Basement And Ground Floor 67 Upper Berkeley Street London W1H 7QX
Display for a temporary period of six months of a non-illuminated estate agent board loca…
2025
Approved
30 Portman Square London W1H 7BH
Proposed 2No. 300 to be added to the stub mast headframe (C/L 34.50m AGL). Proposed 6No…
2025
Approved
16 Bryanston Street London W1H 7EF
Flexible use of part lower ground, ground and first floors as retail, gymnasium, office…
2025
Approved
Flat 3 20A Seymour Street London W1H 7HX
Layout changes including increasing size of bedroom, relocate bathroom door to create an…
2025
1 New Quebec Street London W1H 7DD
Installation of secondary glazing, installation of kitchenette to ground floor, waterproo…
2025
Flat 2 68 Upper Berkeley Street London W1H 7QY
Internal alterations to the first floor flat with the inclusion of a new boiler flue pene…
2025
Approved
12 Seymour Street London
Installation of two new anchor points to the existing roof.
2025
Approved
10 Seymour Street London W1H 7HT
Installation of two new safety anchor points to the main pitched roof.
2025
Approved
4 Bryanston Street London W1H 7BY
Installation of a replacement high level extract duct to run from rear ground floor level…
2025
Approved
4 Bryanston Street London W1H 7BY
Installation of a replacement high level extract duct to run from rear ground floor level…
2025
Approved
4 Bryanston Street London W1H 7BY
Alterations to the street-facing elevations. (Linked with 25/04006/FULL)
2025
Approved
4 Bryanston Street London W1H 7BY
Alterations to the street-facing elevations. (Linked with 25/04007/LBC)
2025
Refused
4 Bryanston Street London W1H 7BY
Insertion of new windows at ground floor on the Seymour Street elevation. (Linked with 25…
2025
Refused
4 Bryanston Street London W1H 7BY
Insertion of new windows at ground floor on the Seymour Street elevation. (Linked with 25…
2025
Refused
1 New Quebec Street London W1H 7DD
Installation of secondary glazing; installation of kitchenette to ground floor and waterp…
2025
Approved
4 Bryanston Street London W1H 7BY
Internal alterations at ground floor level in the restaurant accommodation.
2025
18 New Quebec Street London W1H 7RX
Internal reconfiguration to convert existing two residential units into 1 x 3-bedroom mai…
2016
Refused
23 New Quebec Street London W1H 7SD
Display of internally illuminated Stainless steel framed light box measuring 0.17m x 0.17…
2016
Approved
City Of Quebec 12 Old Quebec Street London W1H 7AF
Use of the public highway for the placing of 158 outdoor seats, 40 tables, 26 canvas barr…
2016
Approved
2 Wallenberg Place City Of Westminster London W1H 7TN
Internal alterations at ground floor level to allow the creation of four hotel bedrooms a…
2016
Approved
2 Wallenberg Place City Of Westminster London W1H 7TN
Use of part ground floor as four additional hotel bedrooms (Class C1) for use in associat…
2016
Approved
2 Wallenberg Place City Of Westminster London W1H 7TN
Removal of Condition 4 of planning permission dated 5 August 2009 (RN: 09/03783/FULL) for…
Westminster
Planning Authority Score
3.7/10
Below average
#209 of 292 councils
Relevant to this application:
Householder decisions
Westminster is slower than most councils at deciding householder applications, ranking #227 out of 292. Only 27% of applications have the time limit extended, well below the 40% 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 79% approved vs 90% nationally.
One of the strictest councils
only 79% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application.
View full council performance
Westminster decision performance
Based on MHCLG data, 2025
86%
Overall approval rate
Below avg (87%) #200 of 292
79%
Householder approved
Below avg (90%) #279 of 292
53%
Decided in 8 weeks
Below avg (64%) #227 of 292
27%
Extended time limit
Below avg (40%) #43 of 292
86%
Minor dwellings approved
14 decided (1-9 homes)
67%
Major dwellings approved
3 decided (10+ homes)
86%
Change of use approved
140 decided
4,828
Total decisions
669 refused in 2025
Track this application
18 Seymour Street London W1H 7HU