Planning application
14-16 Treport Street SW18 2BP
Works: New dwelling Extension Loft or dormer
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats. [RECONSULT DUE TO AMENDMENTS] namely: reduced size of rear terraces, installation of 1.7m opaque screens surrounding terraces, reduced size of rooflights to front elevation and open riser stairs to access new residential units.
As published by the council, reference 2025/4086
Application record
- Reference
- 2025/4086
- Type
- Application for Full Permission
- Status
- FINAL DECISION
- Decision
- Approve with Conditions CIL Liable
- Received
- 11 Nov 2025
- Validated
- 20 Nov 2025
- Decided
- 20 Feb 2026
- Ward
- Wandle
- Decision by
- Full Committee
- Postcode
- SW18 2BP
Site history
Applications at this address on the Wandsworth register
This site has had 3 applications since 2025: 2 approved, 1 refused.
-
2026/2100 Granted
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste storage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 - Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
-
2026/1059 Refused
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste stroage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 (Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
Timeline
Dates from the published record
-
11 Nov 2025
Received by Wandsworth
-
20 Nov 2025
Validated
Checked as complete and ready for consideration.
-
20 Feb 2026
Decision issued: Approve with Conditions CIL Liable
-
10 Aug 2026
Added to PlanIndex
Related applications
Cases linked to this one on the register
2 later applications on the register refer to this one:
-
2026/2100 Granted
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste storage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 - Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
-
2026/1059 Refused
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste stroage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 (Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
Documents
Plans, drawings, consultee responses and the officer's report
12 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Wandsworth granted permission on 20 February 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About full applications
A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste stroage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 (Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
Refused Full applications New dwelling Extension +1 10 docs -
14-16 Treport Street SW18 2BP
Details of water calculations, cycle storage, and waste storage pursuant to conditions 7, 8 and 9 of planning permission dated 20/02/2026 ref. 2025/4086 - Alterations including erection of mansard extensions to the main rear roof including raising the existing ridge heights by 180mm; erection of extensions above part of the two-storey back additions and formation of roof terraces above the two-storey back additions. Proposed works in connection with creation of 2 additional two-bedroom flats.
Granted New dwelling Extension +1 -
6B Treport Street SW18
Erection of mansard style rear roof extension to main roof and over part of rear addition.
Withdrawn Householder Extension Loft or dormer 10 docsDomestic -
50 Aslett Street SW18 2BN
89% historically approved · decision due ~24 Sep
Alterations including erection of a rear roof extension to main roof and an extension over the two-storey rear addition.
Awaiting decision Extension -
42 Aslett Street SW18 2BN
Erection of single storey side extension.
Granted Householder Extension 6 docsSmall domestic -
Flat First Floor A 195 Garratt Lane SW18 4DR
Details of BREEAM (post construction) pursuant to condition 4 planning permission dated 18/12/2023 ref 2023/3708 (Alterations including erection of mansard roof extension to main rear roof, including raising the ridge by 300mm. Extension above twostorey back addition with French doors and formation of a roof terrace with glazed 1.7m screen surround; Installation of French doors and safety railings to first and second floor back addition replacing existing windows; installation of 2 x windows to second floor, and replacement windows to first floor side elevation of back addition. Works in connection with the proposed conversion of the existing 1 x 3-bedroom flat to 3 x 1-bedroom flats with associated cycle and refuse storage.)
Granted Full applications New dwelling Extension +2 7 docs
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