8 Montagu Mews West London W1H 2EE Data via plota.co.uk

26/03228/FULL - Full Planning Permission Application Pending
Extensions & alterationsUtility infrastructure

Proposal

Erection of a single-storey roof extension, installation of air conditioning plant within an acoustic enclosure, and associated alterations to the front and rear facades of the existing dwellinghouse (Class C3). Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
15 May 2026
✓
Consultation
28 May 2026
Decision
Expected by 6 Nov 2026

Under consideration

No decision has been issued yet. Plota predicted a decision around 6 Nov 2026; it is now day 175.

The consultation period closed on 1 Jul 2026.

Documents 33

Statements & assessments 3

PDF MATERIAL DETAILS AND SUSTAINABLE DESIGN Design and Access Statement · 15 May 2026 View ↗ PDF PLANNING STATEMENT LETTER Background Papers · 15 May 2026 View ↗ PDF PLANNING STATEMENT LETTER APPENDIX 1 Background Papers · 15 May 2026 View ↗

Plans & drawings 15

PDF LOCATION PLAN Drawing · 15 May 2026 View ↗ PDF EXISTING GROUND FLOOR PLAN Drawing · 15 May 2026 View ↗ PDF EXISTING FIRST FLOOR PLAN Drawing · 15 May 2026 View ↗ PDF EXISTING ROOF PLAN Drawing · 15 May 2026 View ↗ PDF EXISTING FRONT ELEVATION Drawing · 15 May 2026 View ↗ PDF EXISTING REAR ELEVATION AND EXISTING SECTIONS Drawing · 15 May 2026 View ↗ PDF PROPOSED GROUND FLOOR PLAN Drawing · 15 May 2026 View ↗ PDF PROPOSED FIRST FLOOR PLAN Drawing · 15 May 2026 View ↗ PDF PROPOSED SECOND FLOOR PLAN Drawing · 15 May 2026 View ↗ PDF PROPOSED ROOF PLAN Drawing · 15 May 2026 View ↗ PDF PROPOSED FRONT ELEVATION Drawing · 15 May 2026 View ↗ PDF PROPOSED SIDE ELEVATIONS Drawing · 15 May 2026 View ↗ PDF WEST PROPOSED 3D VIEWS Drawing · 15 May 2026 View ↗ PDF PROPOSED REAR Drawing · 15 May 2026 View ↗ PDF AC ENCLOSURE DETAILED DRAWINGS AE 8284 00 Drawing · 15 May 2026 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 15 May 2026 View ↗ PDF FEECALCULATION Background Papers · 15 May 2026 View ↗

Consultation & comments 2

PDF REPRESENTATION COMMENT - MARYLEBONE ASSOCIATION Consultee Comment · 29 Jun 2026 View ↗ PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 28 May 2026 View ↗

Other documents 11

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 28 May 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 28 May 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 28 May 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 21 May 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 21 May 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 15 May 2026 View ↗ PDF EXISTING SITE IMAGES Photo · 15 May 2026 View ↗ PDF ACOUSTIC REPORT Background Papers · 15 May 2026 View ↗ PDF DAYLIGHT AND SUNLIGHT REPORT 160426 Background Papers · 15 May 2026 View ↗ PDF DAYLIGHT SUNLIGHT SUPPLEMENTARY LETTER 110526 Background Papers · 15 May 2026 View ↗ PDF ENCLOSURE SPEC FOR CONDENSERS Background Papers · 15 May 2026 View ↗

All documents on the council site ↗

Site constraints 9

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 ↗
42 listed buildings within 150 m
Nearest: 1A, BRYANSTON SQUARE W1 (See details for further address information), Grade II, 2 m away · 42 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 42 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.
Also on the record
National infrastructure project 225 m away: London Strategic Heat Main Project, at pre-application; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Priority habitat 44 m away: Deciduous woodland.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 2 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.

Sales history 2

Last sold for £2,400,000 in April 2026. Terraced house, freehold.

10 April 2026£2,400,000
16 September 1996£160,000Leasehold

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area140 m² (1,507 sq ft)
Energy ratingD (61 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 October 2019, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

2 Jun 2026Approved

15 - 16 Montagu Mews South London W1H 7ET

Details of all new windows, omission of the rooflight to the front roof slope co...

26/03608/ADFULL
22 May 2026Approved

11 Montagu Mews South London W1H 7ER

Installation of replacement double glazed windows.

26/03408/FULL

Nearby new applications

30 Oct 2026Pending

39 Montagu Square London W1H 2LL

Amalgamation of Flats 3 and 4 (Use Class C3) to form one single dwelling (Use Cl...

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30 Oct 2026Pending

39 Montagu Square London W1H 2LL

Amalgamation of Flats 3 and 4 to form one single dwelling including associated i...

26/07416/LBC
29 Oct 2026Pending

Flat 6 15 Fitzhardinge Street London W1H 6EQ

Replacement of existing timber sash windows with slim double glazed timber sash ...

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29 Oct 2026Pending

Flat 6 15 Fitzhardinge Street London W1H 6EQ

Replacement of existing timber sash windows with slim double glazed timber sash ...

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28 Oct 2026Pending

90 Gloucester Place London W1U 6HS

Use of the building as an embassy (sui generis)

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27 Oct 2026Pending

41 Manchester Street London W1U 7LN

Details of a methodology, where applicable, and detailed drawings (Scale 1:20 an...

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Important details

Council
Westminster
Application type
Full Planning Permission Application
Postcode
W1H 2EE
Received
15 May 2026
Validated
15 May 2026
Ward
Marylebone
Case officer
Show
Target decision
6 Nov 2026
Applicant
Show
Agent
SM Planning

Decision outlook

Day 175, past the statutory target. 83% of extensions in Westminster are decided within thirteen weeks; extensions of time are common, and the council need not decide on the day. Last seen undecided on 4 Nov 2026.

Day 175119 days past the 56-day target
56%decided within 8 weeks
88%approved
1,937decided in the last year

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

Public comments

3comments received
3 objecting

100% object · above the UK average of 74%

21 neighbours consulted · Last counted 4 Nov 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14875212
Planning Portal ref
PP-14875212
Comments by
1 Jul 2026
Site or press notice
28 May 2026
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
Flat 2 5 Bryanston Square London W1H 2DH
Internal alterations including repair, refurbishment and repainting of the windows and fr…
25/07257/FULL
2025
Flat 2 5 Bryanston Square London W1H 2DH
Internal alterations including replacement of windows and French Windows; refurbishment o…
25/07211/LBC
2025
Ellerton House 11 Bryanston Square London W1H 2DQ
Replacement of the existing timber pergola over the rear terrace with new. Linked with 25…
25/07174/LBC
2025
Ellerton House 11 Bryanston Square London W1H 2DQ
Replacement of the existing timber pergola over the rear terrace with new. Linked with 25…
25/07173/FULL
2025 Approved
Flat 4 58 Montagu Square London W1H 2LS
Internal alterations to flat at fourth floor level including installation of a spiral sta…
25/04771/LBC
2025 Refused
Flat 2 5 Bryanston Square London W1H 2DH
Installation of replacement windows, refurbishment of front and rear balconies and railin…
25/03423/LBC
2025 Refused
Flat 2 5 Bryanston Square London W1H 2DH
Installation of replacement windows, refurbishment of front and rear balconies and railin…
25/05029/FULL
2025
Flat 1 49 Montagu Square London W1H 2LW
Replacement of existing single glazed sash timber windows and frames with new double glaz…
25/05706/LBC
2025
Flat 1 49 Montagu Square London W1H 2LW
Replacement of existing single glazed sash timber windows and frames with new double glaz…
25/05705/FULL
2025
Flat 2 13 Montagu Street London W1H 7EX
Installation of airbrick to front elevation, new secondary glazing, reconfiguration, acou…
25/04426/LBC
2025
Flat 2 13 Montagu Street London W1H 7EX
Installation of airbrick to front elevation, new secondary glazing, reconfiguration, acou…
25/04425/FULL
2025 Approved
68 Great Cumberland Place London W1H 7TX
1 x Japanese maple (T2): Reduce all round by approx. 1m, leaving furnishing growth . Thin…
25/03179/TCA
2025
Flat 3 12 Montagu Square London W1H 2LD
Replace existing rear door with hardwood double doors with fan light over and fixed side…
25/02495/LBC
2025
Flat 4 1 Bryanston Square London W1H 2DH
Internal alterations including new partitions, joinery and cornices, kitchen and bathroom…
25/01336/LBC
2025
Flat 7 1 Bryanston Square London W1H 2DH
Replacement of two rooflights and two crittal windows with timber box sash windows and re…
25/01181/LBC
2024
Flat 1 58 Montagu Square London W1H 2LS
Creation of a WC, aligning the doors of the flat and minor internal layout amendments.
24/08812/LBC
2024 Approved
Flat 1 8 Montagu Square London W1H 2LB
Installation of air conditioning units within enclosure within rear lower ground floor le…
24/07049/LBC
2024
Ellerton House 11 Bryanston Square London W1H 2DQ
Replacement of windows and doors on the rear elevations of the first floor level to Flat…
24/05999/LBC
2024
12 Bryanston Square London W1H 2DQ
Subdivision of the existing single Apartment, 12 Bryanston Square, to two, 3-bedroom dwel…
24/05321/LBC
2024
12 Bryanston Square London W1H 2DQ
Subdivision of the existing single Apartment, 12 Bryanston Square, to two, 3-bedroom dwel…
24/05320/FULL
2018 Approved
13 Bryanston Square London W1H 2DN
Installation of internal air conditioning units at ground and basement level, ceiling wor…
18/03208/LBC
2018 Refused
44 Montagu Square London W1H 2LN
Installation of lower ground fixed windows, creation of lower ground external and additio…
18/02612/FULL
2018 Refused
44 Montagu Square London W1H 2LN
Installation of lower ground fixed windows, creation of lower ground external additional…
18/02613/LBC
2018 Approved
13A Bryanston Mews East London W1H 2DB
Installation of a new boiler within the rear lightwell vault and an external flue within…
18/03872/LBC
2018 Approved
Flat 15 Ellerton House 11 Bryanston Square London W1H 2DQ
Internal alterations at first floor level.
18/02047/LBC
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

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

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.