9 Seymour Mews London W1H 6BE Data via plota.co.uk

25/05476/FULL - Full Planning Permission Application Approved

Proposal

Replacement of existing single glazed timber windows with new double glazed windows. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
5 Aug 2025
✓
Consultation
21 Aug 2025
✓
Approved
30 Sept 2025

Approved on 30 Sept 2025 · Delegated Decision · Last checked 31 Oct 2026

Documents 8

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 30 Sept 2025 View ↗ PDF DELEGATED REPORT Report · 30 Sept 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 21 Aug 2025 View ↗

Other documents 5

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 21 Aug 2025 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 21 Aug 2025 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 21 Aug 2025 View ↗ PDF RECEIPT OF APPLICATION Other · 12 Aug 2025 View ↗ PDF RECEIPT OF APPLICATION Other · 12 Aug 2025 View ↗

All documents on the council site ↗

Site constraints 10

Portman Estate conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
Article 4 direction
Article 4 Basement Development Permitted Rights Removed. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Air quality management area: Westminster AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
26 listed buildings within 150 m
Nearest: 14-18, Fitzhardinge Street W1, Grade II, 5 m away · 1 Grade II*, 25 Grade II
The site itself is not listed. Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.
Show all 26 with distances
Historic England ↗
Central activities zone
The core of central London in the London Plan.
Offices, culture and the other strategic functions of the centre take priority over new housing here.
Registered park or garden 60 m away: Portman Square and Manchester Square
Its setting is a consideration for work nearby.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
Historic England ↗
Also on the record
National infrastructure project 1948 m away: Thames Tideway Tunnel; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Town centre 53 m away: Baker Street (part).
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

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

Floor area125 m² (1,345 sq ft)
Energy ratingD (68 out of 100), could reach B
PropertyMid-terrace house, 6 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in February 2018, 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
Full Planning Permission Application
Postcode
W1H 6BE
Received
5 Aug 2025
Validated
5 Aug 2025
Ward
Marylebone
Case officer
Show
Target decision
30 Sept 2025
Decision
Application Permitted
Decision date
30 Sept 2025
Decision level
Delegated Decision
Applicant
Show
Agent
MDB Associates

How this decision compares

Decided in 56 days from validation, 20 days faster than Westminster's median of 76 for full applications. Approved, as 86% of full applications here are.

35%decided within 8 weeks
86%approved
2,198decided in the last year

Plota live figures for full applications decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

No public comments yet.

5 neighbours consulted · Last counted 31 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-13971341
Planning Portal ref
PP-13971341
Comments by
24 Sept 2025
Site or press notice
21 Aug 2025
Env. assessment
No

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025
12 Manchester Square London W1U 3PP
Display for a temporary period of six months of a non-illuminated estate agent board loca…
25/08155/AD7
2025
27 Duke Street London W1U 1LE
Display of internally illuminated temporary installation of 5 x cross street Christmas de…
25/07820/ADV
2025
2A Duke Street London W1U 3EJ
Internal alterations and refurbishment works.
25/07632/LBC
2025
Basement And Ground Floor 6 - 7 Portman Square London W1H 6NA
Display of two internally illuminated projecting sign measuring 0.75m x 0.75m, 0.18m x 1…
25/07373/ADV
2025
4 Portman Square London W1H 6LD
Replacement entrance door with a new full-height glazed door; replacement of windows 1 an…
25/07152/FULL
2025 Approved
Orchard Court Portman Square London W1H 6LE
Display of an internally illuminated (letters only) projecting sign measuring 0.80m x 0.7…
25/05613/ADV
2025 Approved
1 Duke Street London W1U 3EA
Internal alterations of new timber stud partitions at first floor and second floor levels.
25/03642/LBC
2025 Approved
132 Wigmore Street London W1U 3SD
Installation of replacement shopfront.
25/01944/FULL
2025
110 Wigmore Street London W1U 3RW
Use of the highway forecourt for the placement of 10 x tables, 20 x chairs and 2 x freest…
25/03118/TCH
2025 Approved
4 Fitzhardinge Street London W1H 6EG
Display for a temporary period of six months of a non-illuminated estate agent board atta…
25/01885/AD7
2025
9 Manchester Square London W1U 3PL
Internal works comprising electrical works, decorate and fire proof internal doors, refur…
25/00515/LBC
2024
Orchard Court Portman Square London W1H 6LE
Alterations to shopfronts and entrances to Portman Square, Wigmore Street and Fitzharding…
24/08325/FULL
2024
Second Floor 3 Fitzhardinge Street London W1H 6EF
Installation of electrical floor boxes within existing timber floor boards to second floo…
24/07400/LBC
2024
Orchard Court Portman Square London W1H 6LE
Display of vinyls on glazing over a total area of 8m x 152m and graphics applied to hoard…
24/06202/ADV
2024
5 Fitzhardinge Street London W1H 6ED
Internal upgrades, repair and extension of a Georgian Townhouse; new internal finishes an…
24/05919/LBC
2024
5 Fitzhardinge Street London W1H 6ED
Building services to be removed, replaced and relocated, installation of air source heat…
24/05918/FULL
2024
11 Manchester Square London W1U 3PW
Waterproofing to basement office and mechanical ventilation to basement storage and adapt…
24/03797/LBC
2024
11 Manchester Square London W1U 3PW
Waterproofing to basement office and mechanical ventilation to basement storage and adapt…
24/03796/FULL
2024
4 Duke Street London W1U 3EH
Display for a temporary period of six months of a non-illuminated estate agent board atta…
24/03437/AD7
2024 Approved
3 - 5 Duke Street London W1U 3ED
Installation of three air conditioning condenser units at roof level.
24/00126/FULL
2018 Approved
13 Manchester Square London W1U 3PP
Internal alterations and installation of plaque to front elevation.
18/03418/LBC
2018 Approved
Flat 20 Orchard Court Portman Square London W1H 6LE
Replacement of windows to third floor apartment on Portman Square
18/01463/FULL
2018 Approved
136 Wigmore Street London W1U 3SF
Display of one internally illuminated (letters only) fascia sign measuring 0.82m x 3.92m.
18/02226/ADV
2017 Approved
Seymour Mews House 26-37 Seymour Mews London W1H 6BN
Variation of Condition 1 of planning permission dated 04 October 2017 (RN 17/06854/FULL)…
17/08835/FULL
2017 Approved
110 Wigmore Street London W1U 3RW
Variation of condition 5 of planning permission dated 9 December 2016 (RN 16/09836/TCH) f…
17/09796/FULL
Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Householder decisions

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.

One of the strictest councils
only 81% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Westminster decision statistics
Based on MHCLG data, the year to March 2026
86%
Overall approval rate
Below avg (87%) #201 of 296
81%
Householder approved
Below avg (90%) #277 of 296
44%
Decided in 8 weeks
Below avg (63%) #258 of 296
28%
Extended time limit
Below avg (41%) #46 of 296
83%
Minor dwellings approved
12 decided (1-9 homes)
67%
Major dwellings approved
3 decided (10+ homes)
81%
Change of use approved
133 decided
4,602
Total decisions
648 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

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.