Planning application
25/05262/FULL
1 Devonshire Close London W1G 7BA
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.
As published by the council, reference 25/05262/FULL
Timeline
Dates from the published record
-
28 Jul 2025
Received by Westminster
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21 Aug 2025
Validated
Checked as complete and ready for consideration.
-
14 Oct 2025
Decision issued: Application Refused
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21 Jul 2026
Added to PlanIndex
What refusal means
The process from here
The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.
Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.
About full applications applications
How this application type works
A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.
Nearby applications
Within 500 metres
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25/08126/FULL Awaiting decision
1 Devonshire Close London W1G 7BA
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 (Class C3).
-
25/05261/FULL Granted
1 Devonshire Close London W1G 7BA
Erection of a single storey mansard roof extension and extensions at rear ground and first floor levels. Alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling.
-
25/09033/LBC Granted
110 Harley Street London W1G 7JG
Installation of a PVC duct within the basement lightwell to facilitate an external fibre cable routing and a fibre termination box, installation of internal fibre cabling from the termination point to a communications rack located within the basement communications room.
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25/06888/TELNOT Decided
110 Harley Street London W1G 7JG
Regulation 5 Notice of Intention to Install Fixed Line Broadband Apparatus to a Listed Building.
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25/08776/ADFULL Granted
4 Devonshire Close London W1G 7BA
Details of site investigation (phase 1 - 3) pursuant to condition 9 (part) of planning permission dated 19 November 2025 (RN: 25/04318/FULL)
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25/08775/ADFULL Granted
4 Devonshire Close London W1G 7BA
Details of Whole Life Carbon Assessment pursuant to condition 7 (part 1) of planning permission dated 19 November 2025 (RN: 25/04318/FULL)
Other full applications applications
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26/04824/ADFULL Granted
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Detailed design and specification of new blinds to NZH based on mock-up trials on-site. pursuant to condition 32 (i) of planning permission dated 8th April 2024 (23/00571/FULL).
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26/04829/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
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26/04841/ADFULL Granted
29 Henstridge Place London NW8 6QD
Details of the facing materials you will use, including glazing, and elevations and roof plans annotated to show where the materials are to be located pursuant to condition 5 of planning permission dated 18th November 2025 (RN:25/06159).
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26/04989/FULL Awaiting decision
1 Kildare Terrace London W2 5JT
Erection of a mansard roof extending over the main house and side wing, replacement lower ground rear extension with roof terrace above, lowering of lower ground floor slab, installation of an air source heat pump in rear garden, new front boundary treatment, and new second floor window on the north elevation.
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26/04986/FULL Awaiting decision
Inver Court Inverness Terrace London W2 6JB
Replacement of combustible materials in the render facades; timber decking and plastic soffits/ fascias to terraces with non-combustible materials on the 5th and 6th floors.