11 Robert Adam Street London W1U 3HN Data via plota.co.uk
Proposal
Installation of new secondary glazing to the internal faces of existing single glazed historic windows , including new double glazed timber windows to replace existing non historic windows. (Linked with 26/03101/LBC) Data via plota.co.uk
Application progress
Approved on 9 Jul 2026 · Delegated Decision · Last checked 11 Jul 2026
Documents 27
Decision & officer reports 2
Statements & assessments 3
Plans & drawings 15
Application forms 1
Consultation & comments 1
Other documents 5
Associated applications 2
- FullInstallation of new secondary glazing to the internal faces of existing single glazed historic…This application26/03100/FULL
Site constraints 10
Show all 37 with distances
- 0 m7-11, Robert Adam StreetGrade II
- 26 m2-5, Fitzhardinge Street W1Grade II
- 64 mHertford HouseGrade II
- 64 mForecourt Walls, Gate Piers and Railings to Hertford HouseGrade II
- 70 m14-18, Fitzhardinge Street W1Grade II
- 80 mWestmoreland Arms Public HouseGrade II
- 84 m12-14, Manchester Square W1Grade II
- 90 m51 and 52, Manchester Street W1Grade II
- 94 mDrinking Fountain in the forecourt of Hertford House (The Wallace Collection)Grade II*
- 96 mDurrant's HotelGrade II
- 102 m49 and 50, Manchester Street W1Grade II
- 111 m8-11, Manchester Square W1Grade II
- 114 m47 and 48, Manchester Street W1Grade II
- 115 m1-5, Spanish Place W1Grade II
- 124 m2a, Duke Street W1Grade II
- 128 m61 and 63, Blandford Street W1Grade II
- 130 m65, Blandford Street W1Grade II
- 130 m34, Baker Street W1Grade II
- 130 m24, George Street W1Grade II
- 130 m22-25, Manchester Square W1Grade II
- 131 m47A, MANCHESTER STREET W1 (See details for further address information)Grade II
- 135 mPresbytery to the Roman Catholic Church of St JamesGrade II
- 138 m67, BLANDFORD STREET (See details for further address information)Grade II
- 138 m2, Duke Street W1Grade II
- 138 m1a, Duke Street W1Grade II
- 138 mRoman Catholic Church of St James (Spanish Place)Grade II*
- 141 m128, Wigmore Street W1Grade II
- 141 m124, Wigmore Street W1Grade II
- 141 m126, Wigmore Street W1Grade II
- 142 m130, Wigmore Street W1Grade II
- 142 m122, Wigmore Street W1Grade II
- 143 m4-7, Manchester Square W1Grade II
- 144 mHamilton Memorial Drinking FountainGrade II
- 146 m1, Duke Street W1Grade II
- 147 m4, Duke Street W1Grade II
- 149 m11, Hinde Street W1Grade II
- 149 m26, MANCHESTER SQUARE W1 (See details for further address information)Grade II
Checked on 6 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. 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.
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Important details
- Council
- Westminster
- Application type
- Full Planning Permission Application
- Postcode
- W1U 3HN
- Received
- 12 May 2026
- Validated
- 12 May 2026
- Ward
- Marylebone
- Case officer
- Show
- Target decision
- 7 Jul 2026
- Decision
- Application Permitted
- Decision date
- 9 Jul 2026
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- MDB Associates
How this decision compares
Decided in 58 days from validation, about the council's usual 55 days. Approved, as 88% of extensions here are.
Plota live figures for extensions decided by Westminster in the last twelve months, from validation. Westminster decision record →
Consultation & key dates
- Alt. reference
- PP-14703993
- Planning Portal ref
- PP-14703993
- Comments by
- 1 Jul 2026
- Site or press notice
- 10 Jun 2026
- 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.
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11 Robert Adam Street London W1U 3HN
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