4 Cornwall Mews South, London, SW7 4RZ Data via plota.co.uk
Proposal
Construction of mansard roof extension with 3 dormers to front and rear, set back from parapets. Alterations to fenestration including replacement of non-original windows and door with white timber framed, double glazed sash windows and traditional hardwood door. Rear windows to be 50% obscure-glazed, photovoltaic panels and enhanced thermal fabric. (AMENDED DESCRIPTION) Data via plota.co.uk
Application progress
Approved on 25 Sept 2026 · Last checked 19 Oct 2026
Site constraints 9
Show all 12 with distances
- 12 m83-93, Cornwall Gardens Sw7Grade II
- 52 mEast Entrance Arch From Grenville PlaceGrade II
- 52 mChurch of St StephenGrade II*
- 67 mWest Entrance Arch From Grenville PlaceGrade II
- 68 m55-82, Cornwall Gardens Sw7Grade II
- 103 m6-16, Cornwall Gardens Sw7Grade II
- 111 m41-52, Queen's Gate Gardens Sw7Grade II
- 113 m11-23, Queen's Gate Gardens Sw7Grade II
- 119 m17-44, Cornwall Gardens Sw7Grade II
- 139 mEast Entrance Arch From Launceston PlaceGrade II
- 141 mEntrance Arch From Gloucester RoadGrade II
- 146 mWest Entrance Arch From Launceston PlaceGrade 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.
Building
From the energy performance certificate lodged in February 2019, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate
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Important details
- Council
- Kensington and Chelsea
- Application type
- Planning Permission
- Postcode
- SW7 4RZ
- Received
- 22 Jul 2026
- Validated
- 29 Jul 2026
- Ward
- Queen's Gate
- Case officer
- Show
- Target decision
- 23 Sept 2026
- Decision
- Granted
- Decision date
- 25 Sept 2026
- Applicant
- Show
- Freehold owner
- Show
How this decision compares
Decided in 58 days from validation, 20 days faster than Kensington and Chelsea's median of 78 for extensions. Approved, as 95% of extensions here are.
Plota live figures for extensions decided by Kensington and Chelsea in the last twelve months, from validation. Kensington and Chelsea decision record →
Consultation & key dates
- Comments by
- 18 Sept 2026
Historical activity at this location
32 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
Kensington and Chelsea ranks #174 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (94%) than the national average (90%).
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.
Freehold owner: 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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4 Cornwall Mews South, London, SW7 4RZ
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