1 Devonshire Close London W1G 7BA Data via plota.co.uk
Proposal
Erection of a mansard roof extension at second floor level and alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling. Data via plota.co.uk
Application progress
Refused on 14 Oct 2025 · Delegated Decision · Last checked 31 Oct 2026
Documents 40
Decision & officer reports 2
Statements & assessments 12
Plans & drawings 17
Application forms 1
Consultation & comments 1
Other documents 7
Site constraints 10
Show all 45 with distances
- 8 m108, Harley Street W1Grade II
- 9 m110 and 112, Harley Street W1Grade II
- 10 m40 Devonshire StreetGrade II
- 16 m106, Harley Street W1Grade II*
- 19 m104, Harley Street W1Grade II
- 33 m43-47, Devonshire Street W1Grade II
- 34 m100 and 102, Harley Street W1Grade II
- 35 m14-18, DEVONSHIRE STREET W1 (See details for further address information)Grade II
- 46 m98, Harley Street W1Grade II
- 54 m96, Harley Street W1Grade II
- 56 m115, Harley Street W1Grade II*
- 56 m111 and 113, Harley Street W1Grade II
- 57 m120 and 122, Harley Street W1Grade II
- 57 m107 and 109, Harley Street W1Grade II*
- 64 m92 and 94, Harley Street W1Grade II*
- 71 m101 Harley StreetGrade II
- 71 m12, Devonshire Street W1Grade II
- 71 m59-67, Portland Place W1Grade II*
- 71 m28 and 30, Weymouth StreetGrade II
- 73 m121, Harley Street W1Grade II*
- 73 m69, Portland Place W1Grade II
- 78 m97 and 99, Harley Street W1Grade II
- 81 m126-150, Harley Street W1Grade II
- 83 m90a, Harley Street W1Grade II
- 85 m115a, Harley Street W1Grade II
- 85 m90, Harley Street W1Grade II
- 92 m75, Portland Place W1Grade II*
- 92 m127-131, Harley Street W1Grade II
- 94 m22, Weymouth StreetGrade II
- 99 m93, Harley Street W1Grade II
- 109 m77-81, Portland Place W1Grade II
- 110 mNumber 33, Including Conservatory, Area Walls and Party Walls With Tile MuralsGrade II
- 111 m31, Weymouth Street W1Grade II
- 114 m88, Harley Street W1Grade II*
- 116 m8-13, Upper Wimpole Street W1Grade II
- 121 m135-145, Harley Street W1Grade II
- 122 m6-12, DEVONSHIRE PLACE W1 (See details for further address information)Grade II
- 123 m7, Upper Wimpole Street W1Grade II
- 123 m86, Harley Street W1Grade II
- 124 m91, Harley Street W1Grade II
- 125 mNumbers 18 to 26 (Including the Former Number 27)Grade I
- 125 m1-6, Upper Wimpole Street W1Grade II
- 128 m41-47, Portland Place W1Grade II*
- 141 mLister Monument in Centre of Road Opposite Numbers 71 to 81 (Odd) Portland PlaceGrade II
- 141 mThird Floor And Fourth Floor Flat 82 Harley Street London W1G 7HB
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.
Building
From the energy performance certificate lodged in September 2020, 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
- W1G 7BA
- Received
- 28 Jul 2025
- Validated
- 21 Aug 2025
- Ward
- Marylebone
- Case officer
- Show
- Target decision
- 16 Oct 2025
- Decision
- Application Refused
- Decision date
- 14 Oct 2025
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Emrys Architects
- Leaseholder
- Show
How this decision compares
Decided in 54 days from validation, 22 days faster than Westminster's median of 76 for full applications. Refused, as 14% 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
8 neighbours consulted · Last counted 31 Oct 2026
Consultation & key dates
- Alt. reference
- PP-14210019
- Planning Portal ref
- PP-14210019
- Comments by
- 24 Sept 2025
- Site or press notice
- 22 Aug 2025
- Env. assessment
- No
Historical activity at this location
28 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.
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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1 Devonshire Close London W1G 7BA
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Leaseholders, on paid plans
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