9 Bentinck Mews London W1U 2AN Data via plota.co.uk

25/09158/FULL - Full Planning Permission Application Approved

Proposal

Installation of an external air source heat pump and replacement of an existing (bathroom) window at rear first floor. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
18 Dec 2025
✓
Consultation
19 Feb 2026
✓
Approved
6 May 2026
✗
Appeal dismissed
14 Sept 2026

Approved on 6 May 2026 · Delegated Decision · Last checked 3 Oct 2026

Documents 15

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 6 May 2026 View ↗ PDF DELEGATED REPORT Report · 6 May 2026 View ↗

Statements & assessments 1

PDF DESIGN AND ACCESS_ PLANNING_HERITAGE AND SUSTAINABILITY STATEMEN Design and Access Statement · 18 Dec 2025 View ↗

Plans & drawings 3

PDF PLANS AND ELEVATIONS (EXISTING) Drawing · 18 Dec 2025 View ↗ PDF 9 BENTINCK MEWS LOCATION PLAN Background Papers · 18 Dec 2025 View ↗ PDF PLANS AND ELEVATIONS (PROPOSED) Drawing · 18 Dec 2025 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 18 Dec 2025 View ↗ PDF CIL FORM CIL Form · 18 Dec 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 19 Feb 2026 View ↗

Other documents 6

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 19 Feb 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 19 Feb 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 19 Feb 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 12 Feb 2026 View ↗ PDF ACOUSTIC REPORT Acoustic report · 18 Dec 2025 View ↗ PDF COVERING LETTER Background Papers · 18 Dec 2025 View ↗

All documents on the council site ↗

Site constraints 10

Harley Street 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 Named permitted development rights are withdrawn here.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 ↗
60 listed buildings within 150 m
Nearest: 3-7, Bulstrode Street W1, Grade II, 4 m away · 60 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 60 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
Registered park or garden 188 m away: Portman Square and Manchester Square; National infrastructure project 1847 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 49 m away: Marylebone High Street.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 6 October 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 area124 m² (1,335 sq ft)
Energy ratingC (70 out of 100)
PropertyMid-terrace house, 4 habitable rooms
Built1900 to 1929
HeatingAir source heat pump, radiators, electric
WallsSolid brick, with internal insulation

From the energy performance certificate lodged in July 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
Full Planning Permission Application
Postcode
W1U 2AN
Received
18 Dec 2025
Validated
18 Dec 2025
Ward
Marylebone
Case officer
Show
Target decision
8 May 2026
Decision
Application Permitted
Decision date
6 May 2026
Decision level
Delegated Decision
Appeal
Dismissed · 14 Sept 2026 · Written Representations · Inspectorate case 6006123 ↗
Applicant
Show
Agent
The Howard De Walden Estate Ltd

How this decision compares

Decided in 139 days from validation, 66 days slower than Westminster's median of 73 for full applications. Approved, as 86% of full applications here are.

36%decided within 8 weeks
86%approved
2,036decided 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.

84 neighbours consulted · Last counted 3 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14497747
Planning Portal ref
PP-14497747
Comments by
25 Mar 2026
Site or press notice
19 Feb 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
44 Welbeck Street London W1G 8DY
Repositioning of third-floor kitchenette door; Installation of a fire door and associated…
25/08107/LBC
2025
8 Bentinck Street London W1U 2BJ
Erection of rear extension from lower ground to 1st floor including new plant enclosure w…
25/08064/LBC
2025
8 Bentinck Street London W1U 2BJ
Erection of rear extension from lower ground to 1st floor including new plant enclosure w…
25/08063/FULL
2025
58 Queen Anne Street London W1G 8HW
Minor internal alterations to the building involving the introduction of double doors at…
25/08051/LBC
2025
17 Welbeck Street London W1G 9XJ
Installation of five condenser units to internal lightwell and internal fan coil units wi…
25/06437/FULL
2025
17 Welbeck Street London W1G 9XJ
Installation of five condenser units to internal lightwell and internal fan coil units wi…
25/06438/LBC
2025
45 Welbeck Street London W1G 8DZ
Replacement of windows with slimline double glazing windows and associated works.
25/06314/FULL
2025
45 Welbeck Street London W1G 8DZ
Replacement of windows with slimline double glazing windows and associated works. (Linked…
25/05979/LBC
2025 Approved
Bentinck Mansions Bentinck Street London W1U 2ER
Installation of mechanical plant at main roof level within an enclosure.
25/04520/FULL
2025 Approved
58 Queen Anne Street London W1G 8HW
Minor internal alterations to replace the existing asbestos doors in the building
25/03879/LBC
2025 Approved
9 Bentinck Street London W1U 2EH
Removal of rear first floor extension and rooflight adjacent to create new terrace with r…
25/03548/LBC
2025 Approved
9 Bentinck Street London W1U 2EH
Removal of rear first floor extension and rooflight adjacent to create new terrace with r…
25/03547/FULL
2025 Approved
3 Bulstrode Street London W1U 2JB
Internal works to re-configure the existing apartment including the removal of an existin…
25/01841/LBC
2025
11 Marylebone Mews London W1G 8PX
Creation of an additional floor via the erection of a mansard roof and extension of an ex…
25/03462/FULL
2025
50 Queen Anne Street London W1G 9LA
Installation of new air source heat pump to existing plant enclosure to rear roof; format…
25/02536/LBC
2025
50 Queen Anne Street London W1G 9LA
Installation of new air source heat pump to existing plant enclosure and roof light to re…
25/02535/FULL
2025
8 Bentinck Street London W1U 2BJ
Erection of a rear extension from lower ground floor to 1st floor including new plant enc…
25/02408/LBC
2025
8 Bentinck Street London W1U 2BJ
Erection of a rear extension from lower ground floor to 1st floor including new plant enc…
25/02407/FULL
2025
Bentinck Mansions Bentinck Street London W1U 2ER
Installation of one air source heat pump to roof
25/02267/FULL
2025
Basement And Ground Floor 45 Welbeck Street London W1G 8DZ
Internal alterations at ground and lower ground floor.
25/02269/LBC
2021 Approved
16 Welbeck Street London W1G 9XF
Installation of air source heat pump at fourth floor rear flat roof.
21/02344/FULL
2020 Approved
20 Thayer Street London W1U 2DD
Alterations to existing pavement in connection with the installation of new smoke vents w…
20/06604/FULL
2021 Approved
28 Thayer Street London W1U 2QN
Replacement of six metal Crittall windows on the front elevation on the first, second and…
21/01638/FULL
2020 Refused
7 Bentinck Street London W1U 2EH
Use of part ground and second floor levels as office accommodation (Class E). (Part of la…
20/06552/FULL
2021 Approved
56 Queen Anne Street London W1G 8LA
Display for a temporary period of six months of a non-illuminated 'to let' board attached…
21/01688/AD7
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.