Flat 3 16 Thayer Street London W1U 3JU Data via plota.co.uk
Proposal
The use of the flat roof of the back addition as a roof terrace, installation of railings around the flat roof of the back addition, installation of decking on the flat roof of the back addition, replacement of a window in the rear mansard elevation with a door and lowering of a section of parapet wall all in connection with the use of the flat roof of the back addition. Data via plota.co.uk
Application progress
Refused on 28 Aug 2025 · Delegated Decision · Last checked 20 Oct 2026
Documents 22
Decision & officer reports 2
Statements & assessments 3
Plans & drawings 2
Application forms 2
Consultation & comments 6
Other documents 7
Site constraints 10
Show all 43 with distances
- 17 m12, Hinde Street W1Grade II
- 20 mChurch House to Hinde Street Methodist ChurchGrade II
- 23 m11, Hinde Street W1Grade II
- 23 mHinde Street Methodist ChurchGrade II
- 32 m22-25, Manchester Square W1Grade II
- 42 m21, Bulstrode Street W1Grade II
- 46 m1-5, Spanish Place W1Grade II
- 47 m19, Bulstrode Street W1Grade II
- 51 mTrinity College of MusicGrade II
- 54 mK6 Telephone Kiosk, junction of Mandeville Place and Hinde Street, MaryleboneGrade II
- 55 m26, MANCHESTER SQUARE W1 (See details for further address information)Grade II
- 57 m2, Hinde Street W1Grade II
- 60 m33-35, Thayer Street W1Grade II
- 62 m1-3, Manchester Square W1Grade II
- 75 m9, Bentinck Street W1Grade II
- 80 mHertford HouseGrade II
- 81 m8, Bentinck Street W1Grade II
- 84 mDrinking Fountain in the forecourt of Hertford House (The Wallace Collection)Grade II*
- 88 m4-7, Manchester Square W1Grade II
- 90 m6, George Street W1Grade II
- 95 mRoman Catholic Church of St James (Spanish Place)Grade II*
- 106 m3-7, Bulstrode Street W1Grade II
- 107 m1a, Duke Street W1Grade II
- 109 mPresbytery to the Roman Catholic Church of St JamesGrade II
- 112 m1, Duke Street W1Grade II
- 113 mForecourt Walls, Gate Piers and Railings to Hertford HouseGrade II
- 114 m24, George Street W1Grade II
- 118 mDurrant's HotelGrade II
- 126 m2a, Duke Street W1Grade II
- 128 m48, Welbeck Street W1Grade II
- 128 m49, Welbeck Street W1Grade II
- 128 m76 and 78, Wigmore Street W1Grade II
- 129 m54, Welbeck Street W1Grade II
- 130 m1, Bentinck Street W1Grade II
- 133 m8-11, Manchester Square W1Grade II
- 135 m9 and 11, Duke Street W1Grade II
- 135 m14 and 16, New Cavendish Street W1Grade II
- 136 m2, Duke Street W1Grade II
- 140 m43-45, Welbeck Street W1Grade II
- 142 m55a, Welbeck Street W1Grade II
- 143 m4, Duke Street W1Grade II
- 146 m14-18, Fitzhardinge Street W1Grade II
- 148 m12-14, Manchester Square W1Grade II
Checked on 1 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 £259,000 in September 2005. Flat or maisonette, 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 September 2022, 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
- Certificate of Lawfulness (existing)
- Postcode
- W1U 3JU
- Received
- 4 Jul 2025
- Validated
- 4 Jul 2025
- Ward
- Marylebone
- Case officer
- Show
- Target decision
- 29 Aug 2025
- Decision
- Application Refused
- Decision date
- 28 Aug 2025
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Steven Pollock Architects
- Leaseholder
- Show
How this decision compares
Decided in 55 days from validation, about the council's usual 53 days. Refused, as 20% of lawful development certificates here are.
Plota live figures for lawful development certificates decided by Westminster in the last twelve months, from validation. Westminster decision record →
Public comments
100% object · above the UK average of 74%
16 neighbours consulted · Last counted 20 Oct 2026
Consultation & key dates
- Alt. reference
- PP-14080404
- Planning Portal ref
- PP-14080404
- Comments by
- 20 Aug 2025
- Site or press notice
- 17 Jul 2025
- Env. assessment
- No
Historical activity at this location
26 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.
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.
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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Flat 3 16 Thayer Street London W1U 3JU
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