9 Weymouth Mews London W1G 7EA Data via plota.co.uk
Proposal
Conversion of part of the basement currently in office use associated with 43 Portland Place (Use Class E) to residential use to extend the existing dwellinghouse at 9 Weymouth Mews (Use Class C3), together with the formation of a new internal staircase connecting the basement to the dwelling, construction of a separating wall, alterations to the rear lightwell elevation and associated internal works. (Linked to 26/07209/LBC) Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision between 14 Dec 2026 and 25 Dec 2026, from Westminster's recent changes of use.
Documents 7
Statements & assessments 4
Plans & drawings 1
Application forms 1
Other documents 1
Site constraints 9
Show all 55 with distances
- 7 m41-47, Portland Place W1Grade II*
- 41 m31, Weymouth Street W1Grade II
- 42 m22, Weymouth StreetGrade II
- 43 mThe JackalopeGrade II
- 45 m27-35 Portland PlaceGrade II*
- 52 m28 and 30, Weymouth StreetGrade II
- 55 mNumber 33, Including Conservatory, Area Walls and Party Walls With Tile MuralsGrade II
- 64 mStatue of Sir George Stuart White in Centre of Road South of Weymouth Street CrossingGrade II
- 69 m61 and 63, New Cavendish Street W1Grade II*
- 70 mThird Floor And Fourth Floor Flat 82 Harley Street London W1G 7HB
- 73 m78, Harley StreetGrade II*
- 75 m86, Harley Street W1Grade II
- 76 m88, Harley Street W1Grade II*
- 79 m90a, Harley Street W1Grade II
- 81 m56 and 58, Portland Place W1Grade II*
- 81 m34-52, Portland Place W1Grade II*
- 91 m90, Harley Street W1Grade II
- 92 mThe Royal Institute of British ArchitectsGrade II*
- 93 m92 and 94, Harley Street W1Grade II*
- 93 m59-67, Portland Place W1Grade II*
- 97 m64 and 66, Harley Street W1Grade II
- 100 m96, Harley Street W1Grade II
- 107 m98, Harley Street W1Grade II
- 110 m62, Harley Street W1Grade II
- 113 m100 and 102, Harley Street W1Grade II
- 113 m82, NEW CAVENDISH STREET W1 (See details for further address information)Grade II*
- 116 m83 and 85, Harley Street W1Grade II*
- 117 m91, Harley Street W1Grade II
- 118 m79 and 81, Harley Street W1Grade II
- 122 m15, Mansfield Street W1Grade II
- 123 m77, Harley Street W1Grade II*
- 123 m8, Hallam Mews W1Grade II
- 125 m93, Harley Street W1Grade II
- 126 m75, Harley Street W1Grade II*
- 130 m104, Harley Street W1Grade II
- 130 m73 Harley StreetGrade II
- 132 m43-47, Devonshire Street W1Grade II
- 132 m5-13, Mansfield Street W1Grade II*
- 133 m97 and 99, Harley Street W1Grade II
- 133 m12, Weymouth Street W1Grade II
- 133 m21, Duchess Mews W1Grade II
- 134 m69 and 71, Harley Street W1Grade II*
- 135 m17-21, Portland Place W1Grade II*
- 138 m69, Portland Place W1Grade II
- 138 m32, Portland Place W1Grade II
- 140 m73, New Cavendish Street W1Grade II
- 142 m19, Duchess Mews W1Grade II
- 142 m76A, NEW CAVENDISH STREET (See details for further address information)Grade II
- 143 m101 Harley StreetGrade II
- 143 m106, Harley Street W1Grade II*
- 143 m7 and 9, Mansfield Mews W1Grade II
- 144 m40 Devonshire StreetGrade II
- 144 m67, Harley Street W1Grade II
- 145 m108, Harley Street W1Grade II
- 145 m26-30, Portland Place W1Grade II*
Checked on 28 October 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.
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 7EA
- Received
- 21 Oct 2026
- Validated
- 21 Oct 2026
- Ward
- Marylebone
- Case officer
- Show
- Target decision
- 16 Dec 2026
- Applicant
- Show
- Agent
- Maddox Planning
Decision outlook
Day 8 of the 56-day target. Westminster usually decides changes of use by day 57.
Plota live figures for changes of use decided by Westminster in the last twelve months, from validation. Westminster decision record →
Public comments
No public comments yet.
Last counted 28 Oct 2026
Consultation & key dates
- Alt. reference
- PP-15302632
- Planning Portal ref
- PP-15302632
- 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.
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9 Weymouth Mews London W1G 7EA
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