8 Bentinck Street London W1U 2BJ Data via plota.co.uk

26/04758/ADFULL - Approval of Details (Full PP) Approved
Extensions & alterations

Proposal

Details of external envelope design of new extension pursuant to condition 9a (partial) of planning permission dated 17 June 2026 (RN: 25/08063/FULL) [Linked to 26/04745/ADLBC] Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
16 Jul 2026
✓
Approved
29 Jul 2026

Approved on 29 Jul 2026 · Delegated Decision · Last checked 6 Aug 2026

Documents 12

Decision & officer reports 4

PDF APPR. OF DETAILS-FULL RESMAT [PE] Decision Notice · 29 Jul 2026 View ↗ PDF DELEGATED REPORT Report · 29 Jul 2026 View ↗ PDF DELEGATED REPORT Report · 29 Jul 2026 View ↗ PDF 25/08063/FULL DECISION NOTICE Background Papers · 16 Jul 2026 View ↗

Plans & drawings 2

PDF REAR EXTENSION ELEVATION B Drawing · 16 Jul 2026 View ↗ PDF REAR EXTENSION ELEVATION A Drawing · 16 Jul 2026 View ↗

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 16 Jul 2026 View ↗

Other documents 5

PDF ACK-APPROVAL OF DETAILS APPL. Background Papers · 29 Jul 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 17 Jul 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 17 Jul 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 16 Jul 2026 View ↗ PDF COVER LETTER Background Papers · 16 Jul 2026 View ↗

All documents on the council site ↗

Associated applications 8

Site constraints 10

Grade II listed: 8, Bentinck Street W1
List entry 1218344 · The pin is inside its outline · 50 more listed buildings within 150 m (50 Grade II)
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 the other 50 with distances
Historic England ↗
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 Named permitted development rights are withdrawn here.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 ↗
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 142 m away: Portman Square and Manchester Square; National infrastructure project 1843 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 19 m away: Marylebone High Street.
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.

Building

Floor area443 m² (4,768 sq ft)
Energy ratingE (asset rating 104)
UseOffices and Workshop Businesses
HeatingHeating and Natural Ventilation

From the energy performance certificate lodged in February 2023, 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
W1U 2BJ
Received
16 Jul 2026
Validated
16 Jul 2026
Ward
Marylebone
Case officer
Show
Target decision
10 Sept 2026
Decision
Application Permitted
Decision date
29 Jul 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Howard de Walden Estates Limited

How this decision compares

Decided in 13 days from validation, 42 days faster than Westminster's median of 55 for extensions. Approved, as 88% of extensions here are.

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

No public comments yet.

Last counted 6 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15050902
Planning Portal ref
PP-15050902
Env. assessment
No

Historical activity at this location

30 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2025
Erection of rear extension from lower ground to 1st floor including new plant enclosure w…
25/08064/LBC
2025
Erection of rear extension from lower ground to 1st floor including new plant enclosure w…
25/08063/FULL
2025
Erection of a rear extension from lower ground floor to 1st floor including new plant enc…
25/02408/LBC
2025
Erection of a rear extension from lower ground floor to 1st floor including new plant enc…
25/02407/FULL
2025
Continued use as Office (Class E (g)(i) at second and third floors of 8 Bentinck Street.
25/00635/CLEUD
Within ~100m

Nearby activity

2025
Flat 3 16 Thayer Street London W1U 3JU
Installation of safety railings, decking and lowered section of parapet wall in connectio…
25/07600/FULL
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 Approved
Bentinck Mansions Bentinck Street London W1U 2ER
Installation of mechanical plant at main roof level within an enclosure.
25/04520/FULL
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
18 Thayer Street London W1U 3JY
Display of non-illuminated fascia and hanging signs measuring 0.13m x 1.27m and 0.50m x 0…
25/02719/ADV
2025
18 Thayer Street London W1U 3JY
Installation of replacement storefront. (Linked with 25/02719/ADV) Consent to Display adv…
25/02718/FULL
2025
Bentinck Mansions Bentinck Street London W1U 2ER
Installation of one air source heat pump to roof
25/02267/FULL
2025
108 Marylebone Lane London W1M 6HH
Display of non illuminated egg sculpture and plinth measuring 0.5m X 1.6m in conjunction…
25/00887/ADV
2025
56 - 58 Marylebone Lane London W1U 2NX
Retention of four heaters to shopfront (retrospective).
25/00302/FULL
2024 Approved
3 Bulstrode Street London W1U 2JB
Reconfiguration of existing apartment including the removal of an existing bathroom and f…
24/07470/LBC
2024 Approved
3 Bulstrode Street London W1U 2JB
Reconfiguration of existing apartment including the removal of an existing bathroom and f…
24/07469/FULL
2024
96 Marylebone Lane London W1U 2QA
Variation of condition 5 of planning permission dated 12 February 2015 (RN:20/07912/FULL)…
24/08235/FULL
2024
24 Thayer Street London W1U 2QN
Display of non illuminated fascia sign measuring 0.81m X 0.16m, non illuminated other sig…
24/07655/ADV
2024 Approved
31A Thayer Street London W1U 2QS
Display for a temporary period of six months of a non-illuminated estate agent board loca…
24/06884/AD7
2024
24 Thayer Street London W1U 2QN
Installation of replacement shopfront.
24/07144/FULL
2024
24 Thayer Street London W1U 2QN
Installation of replacement shopfront.
24/07143/FULL
2024
55A Welbeck Street London W1G 9XQ
Refurbishment of second floor flat including alterations to kitchen and bathroom, replace…
24/06432/LBC
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 Approved
Hinde House 11-14 Hinde Street London W1U 3BD
Replacement of 49 windows with double glazed windows (relates to 11 & 12 Hinde Street onl…
20/08284/LBC
2020 Approved
Hinde House 11-14 Hinde Street London W1U 3BD
Replacement of 49 windows with double glazed units (relates to 11 & 12 Hinde Street only).
20/08283/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
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

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.