4 Mill Street London W1S 2AX Data via plota.co.uk
Proposal
Erection of a rear roof extension at third floor level with a sedum roof to the rear; replacement of windows at second floor level with double glazing timber windows; replacement of door and window to the existing rear first floor extension with double glazing timber windows including replacement of roofing; and associated works all in connection with the use of the first to third floor as four flats (Class C3) Data via plota.co.uk
Application progress
Approved on 28 Oct 2025 · Delegated Decision · Last checked 18 Oct 2026
Documents 29
Decision & officer reports 2
Statements & assessments 2
Plans & drawings 7
Application forms 2
Consultation & comments 1
Other documents 15
Site constraints 10
Show all 43 with distances
- 11 mChurch of St George, Vestry and ObelisksGrade I
- 21 m20, Conduit Street W1Grade II
- 23 m30 St George StreetGrade II
- 23 m32 St George StreetGrade II
- 49 m9, Conduit Street W1Grade II*
- 50 m48, Conduit Street W1Grade II
- 53 m47, Conduit Street W1Grade II
- 56 m8 to 10 St George StreetGrade II
- 56 m46, Conduit Street W1Grade II
- 57 m6 and 7 St George StreetGrade II
- 64 m4 St George StreetGrade II
- 67 m3 St George StreetGrade II
- 70 m42 and 43, Conduit Street W1Grade II
- 72 m12a and 12b St George Street and 46a Maddox StreetGrade II
- 79 m14 St George StreetGrade II
- 79 m13 St George StreetGrade II
- 84 m47, Maddox Street, including workshops to rearGrade II
- 84 m39-42, New Bond StreetGrade II
- 93 m15 St George StreetGrade II*
- 99 m49, Maddox Street W1Grade II
- 103 m36, New Bond Street W1Grade II
- 104 mSotheby'sGrade II
- 105 m16 and 17, St George StreetGrade II
- 107 mTriumph HouseGrade II
- 109 m203-221, Regent Street W1Grade II
- 111 m4, Pollen Street W1Grade II
- 121 m26, New Bond Street W1Grade II
- 122 m24, Hanover Square W1Grade II
- 128 m47 and 48, New Bond Street W1Grade II
- 130 m22 and 23, Old Burlington Street W1Grade II
- 131 m15, Hanover StreetGrade II
- 132 m1 and 2, New Burlington Street W1Grade II
- 137 m223-227, REGENT STREET W1 (See details for further address information)Grade II
- 139 m140, New Bond Street W1Grade II
- 140 m143, New Bond Street W1Grade II
- 140 m135-137, New Bond Street W1Grade II
- 140 m8, Clifford Street W1Grade II*
- 142 m144-146 New Bond Street (Formerly Colnaghi)Grade II
- 143 m131-134, New Bond Street W1Grade II
- 143 m5, Clifford Street W1Grade II
- 145 m4, Clifford Street W1Grade II
- 148 mThe Fine Art SocietyGrade II
- 148 m9, Clifford Street W1Grade II
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 1
Last sold for £125,000 in April 2019. Other property, leasehold.
Sale prices from HM Land Registry's price paid record, matched to this application by its address.
Building
From the energy performance certificate lodged in April 2012, the latest held for this property. The building may have changed since. View the certificate
Every application in Westminster - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
- Council
- Westminster
- Application type
- Full Planning Permission Application
- Postcode
- W1S 2AX
- Received
- 22 Aug 2025
- Validated
- 5 Sept 2025
- Ward
- West End
- Case officer
- Show
- Target decision
- 31 Oct 2025
- Decision
- Application Permitted
- Decision date
- 28 Oct 2025
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- 4D Planning
- Leaseholder
- Show
How this decision compares
Decided in 53 days from validation, 23 days faster than Westminster's median of 76 for full applications. Approved, as 86% of full applications here are.
Plota live figures for full applications decided by Westminster in the last twelve months, from validation. Westminster decision record →
Public comments
81 neighbours consulted · Last counted 18 Oct 2026
Consultation & key dates
- Alt. reference
- PP-14272887
- Planning Portal ref
- PP-14272887
- Comments by
- 22 Oct 2025
- Site or press notice
- 23 Sept 2025
- Env. assessment
- No
Historical activity at this location
27 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
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.
Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
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.
Leaseholders: Information produced by HM Land Registry. © Crown copyright 2026. Source: HM Land Registry, UK and overseas companies that own property in England and Wales, September 2026 release.
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4 Mill Street London W1S 2AX
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Leaseholders, on paid plans
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