11 - 13 Cavendish Square London W1G 0AN Data via plota.co.uk

26/04387/FULL - Full Planning Permission Application Approved
Extensions & alterationsListed buildings

Proposal

Replacement roof lantern and roof tiles. (Linked with 26/04388/LBC) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
2 Jul 2026
✓
Validated
9 Jul 2026
✓
Approved
24 Aug 2026

Approved on 24 Aug 2026 · Delegated Decision · Last checked 25 Aug 2026

Documents 15

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 24 Aug 2026 View ↗ PDF DELEGATED REPORT Report · 24 Aug 2026 View ↗

Statements & assessments 1

PDF PLANNING DAS AND HERITAGE STATEMENT 30.06.26 Design and Access Statement · 2 Jul 2026 View ↗

Plans & drawings 5

PDF MA0261.01.01 SITE LOCATION AND BLOCK PLAN Location Plan · 2 Jul 2026 View ↗ PDF MA0261.01.02 EXISTING PLANS AND ELEVATIONS Drawing · 2 Jul 2026 View ↗ PDF MA0261.01.03 PROPOSED PLANS Drawing · 2 Jul 2026 View ↗ PDF MA0261.01.04 PROPOSED ELEVATIONS Drawing · 2 Jul 2026 View ↗ PDF MA0261.01.05 LANTERN DETAIL Drawing · 2 Jul 2026 View ↗

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 2 Jul 2026 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 22 Jul 2026 View ↗

Other documents 5

PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 22 Jul 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 22 Jul 2026 View ↗ PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 22 Jul 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 3 Jul 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 3 Jul 2026 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 9

Grade II* listed: Bridge
List entry 1066306 · 12 m from the pin · 30 more listed buildings within 150 m (3 Grade II*, 27 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 30 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.
Archaeological priority area: City of Westminster APA 2.5
An assessment or field evaluation may be asked for before ground works.
The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.
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
Inside the City of Westminster built-up area; Town centre 20 m away: West End; Priority habitat 31 m away: Deciduous woodland.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 11 September 2026. Historic England, the Environment Agency, Natural England 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.

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Important details

Council
Westminster
Application type
Full Planning Permission Application
Postcode
W1G 0AN
Received
2 Jul 2026
Validated
9 Jul 2026
Ward
Marylebone
Case officer
Show
Target decision
3 Sept 2026
Decision
Application Permitted
Decision date
24 Aug 2026
Decision level
Delegated Decision
Applicant
Show
Agent
J Butterworth Planning

How this decision compares

Decided in 46 days from validation, 7 days faster than Westminster's median of 53 for extensions. Approved, as 87% of extensions here are.

62%decided within 8 weeks
87%approved
930decided 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.

36 neighbours consulted · Last counted 25 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15050306
Site or press notice
29 Jul 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
14 Cavendish Square London W1G 9DB
Refurbishment of 14 Cavendish Square, including modest internal and external alterations…
25/07886/FULL
2025
14 Cavendish Square London W1G 9DB
Refurbishment of 14 Cavendish Square, including modest internal and external alterations…
25/07887/LBC
2025 Approved
The Langham 1C Portland Place London W1B 1JA
Replacement and increase in height of the existing luggage store entrance door, including…
25/06077/LBC
2025 Approved
The Langham 1C Portland Place London W1B 1JA
Replacement and increase in height of the existing luggage store entrance door, including…
25/06240/FULL
2025 Approved
13 Harley Street London W1G 9QG
Internal alterations throughout the building to include the construction of four demounta…
25/04782/LBC
2025 Approved
13 Harley Street London W1G 9QG
Creation of new terrace areas at ground floor level within a lightwell and at the rear of…
25/04781/FULL
2025 Approved
9 Cavendish Square London W1G 9DF
Installation of a non-mechanical louvre at lower ground floor level on the Chandos Street…
25/05090/FULL
2025 Approved
12 Harley Street London W1G 9PB
Installation of new handrails at no.8, 10 and 12; and repairs to existing front entrance…
25/04974/LBC
2025 Approved
12 Harley Street London W1G 9PB
Installation of new handrails at no.8, 10 and 12; and repairs to existing front entrance…
25/04973/FULL
2025
First Floor 15 Harley Street London W1G 9QQ
Re-orientation of an existing air handling unit (AHU) located on the rooftop of the moder…
25/06470/LBC
2025
First Floor 15 Harley Street London W1G 9QQ
Re-orientation of an existing air handling unit (AHU) located on the rooftop of the moder…
25/06469/FULL
2025 Approved
10A Chandos Street London W1G 9DQ
Display for a temporary period of six months of a non-illuminated estate agent board atta…
25/03455/AD7
2025
4 Dean's Mews London W1G 9EF
Removal of the existing roof features and creation of a single storey extension, the exca…
25/02391/FULL
2025
4 Dean's Mews London W1G 9EF
Removal of the existing roof features and creation of a single storey extension, the exca…
25/02392/LBC
2025
Cavendish Square London
Display of non illuminated egg sculpture and plinth measuring 0.5m X 1.6m for a temporary…
25/00886/ADV
2025
14 Cavendish Square London W1G 9DB
Use of lower ground, ground, first, and second floors as a not-for-profit museum (Use Cla…
25/00722/FULL
2024
15 - 19 Cavendish Place London W1G 0QE
Erection of two storey roof extension, plus mezzanine to provide additional office (Class…
24/08328/FULL
2024
12 Harley Street London W1G 9PB
Installation of new handrails and replacement of existing front entrance steps at 8, 10 a…
24/07385/LBC
2024
12 Harley Street London W1G 9PB
Installation of new handrails and replacement of existing front entrance steps at 8, 10 a…
24/07384/FULL
2024 Withdrawn
1 - 7 Harley Street London W1G 9QD
Minor internal and external alterations in connection with the installation of photovolta…
24/02588/LBC
2021 Approved
Cavendish House 18 Cavendish Square London W1G 0PJ
Display for a temporary period of six months of a non-illuminated estate agent board loca…
21/04517/AD7
2021 Approved
Cavendish Square London
Temporary display of signages at Cavendish Square in association with the pop-up Summer E…
21/02413/ADV
2021 Approved
Cavendish Square London
Erection of a Spiegeltent touring structure (with an internal capacity of approximately 5…
21/02412/FULL
2021 Approved
1 Portland Place London W1B 1PR
Erection of gantry, ladder, roof hatch and railing to access roof plant.
21/01654/FULL
2021 Approved
10A Chandos Street London W1G 9DQ
Display for a temporary period of six months of a non-illuminated estate agent board atta…
21/00654/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