45 William Mews London SW1X 9HQ Data via plota.co.uk
Proposal
Replacement of existing single glazed windows and doors with double glazed timber windows and doors. Data via plota.co.uk
Application progress
Approved on 13 Feb 2026 · Delegated Decision · Last checked 9 Oct 2026
Documents 11
Decision & officer reports 2
Plans & drawings 3
Application forms 2
Site constraints 9
Show all 15 with distances
- 23 m5-12, William Street W1Grade II
- 39 mWilton ArmsGrade II
- 61 m4, William Street W1Grade II
- 62 m55-91, KnightsbridgeGrade II
- 65 m1-8, Wilton Place Sw1Grade II
- 67 m9-12 and 14-28, Wilton Place Sw1Grade II
- 75 m11 and 12, Lowndes Square Sw1Grade II
- 111 m1, Albert Gate Sw1Grade II
- 115 mChurch of St PaulGrade II*
- 117 m1-15, Wilton Crescent Sw1Grade II
- 118 m29-31, Wilton Place Sw1Grade II
- 121 m2, Albert Gate Sw1Grade II
- 136 m16-30, Wilton Crescent Sw1Grade II
- 137 mGates and Gatepiers to Albert GateGrade II
- 140 m62 and 64, Knightsbridge Sw1Grade 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 2
Last sold for £2,500,000 in June 2021. Terraced house, freehold.
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 January 2026, the latest held for this property. The building may have changed since. View the certificate
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Important details
- Council
- Westminster
- Application type
- Certificate of Lawfulness (proposed)
- Postcode
- SW1X 9HQ
- Received
- 5 Nov 2025
- Validated
- 13 Nov 2025
- Ward
- Knightsbridge & Belgravia
- Case officer
- Show
- Target decision
- 8 Jan 2026
- Decision
- Application Permitted
- Decision date
- 13 Feb 2026
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Robin Ashley Architects LLP
How this decision compares
Decided in 92 days from validation, 39 days slower than Westminster's median of 53 for lawful development certificates. Approved, as 80% 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
No public comments yet.
Last counted 9 Oct 2026
Consultation & key dates
- Alt. reference
- PP-14368485
- Planning Portal ref
- PP-14368485
- 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.
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45 William Mews London SW1X 9HQ
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