Planning application
15 Blackett Street SW15 1QG
Works: Extension Loft or dormer
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Erection of a dormer extension to main rear roof slope and extension above two-storey rear addition.
As published by the council, reference 2026/0322
Application record
- Reference
- 2026/0322
- Type
- Certificate of Lawfulness - Proposed
- Status
- FINAL DECISION
- Decision
- Approve No Conditions
- Received
- 23 Jan 2026
- Validated
- 3 Feb 2026
- Decided
- 19 Mar 2026
- Ward
- Thamesfield
- Decision by
- Delegated Standard
- Postcode
- SW15 1QG
Timeline
Dates from the published record
-
23 Jan 2026
Received by Wandsworth
-
3 Feb 2026
Validated
Checked as complete and ready for consideration.
-
19 Mar 2026
Decision issued: Approve No Conditions
-
10 Aug 2026
Added to PlanIndex
Documents
Plans, drawings, consultee responses and the officer's report
9 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 a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
Nearby applications
Within 500 metres
-
15 Blackett Street SW15 1QG
Alterations including the erection of a single-storey ground floor rear/side extension and a full width mansard roof extension to the main rear roof slope with French doors and safety balustrade
Granted Householder Extension Loft or dormer +1 10 docsSmall domestic -
5 Blackett Street SW15 1QG
Alterations including erection of dormer roof extension to main rear roof and extension above two-storey back addition.
Granted Householder Extension Loft or dormer 10 docsDomestic -
22 A Hotham Road SW15 1QB
Erection of a roof extension to main rear roof and above part of rear two-storey addition.
Granted Full applications Extension 9 docs -
26 A Blackett Street SW15 1QG
Alterations including erection of a mansard roof extension the main roof with french doors and safety balustrade and erection of extension above part of two-storey rear addition.
Refused Full applications Extension Loft or dormer +1 8 docs -
11 A Borneo Street SW15 1QQ
Alterations including mansard extension to main rear roof slope with French doors and safety railing, raising the ridge by 150mm and extension above rear addition forming a roof terrace with 1.7m obscure glazed balustrade.
Granted Full applications Extension Loft or dormer +1 7 docs -
12 Hotham Road SW15 1QB
87% historically approved · decision due ~25 May
LOCATION: 12 Hotham Road, SW15 1QB PROPOSAL: Front Garden: T1 Lime - Crown reduce by up to 1.5m.
Awaiting decision Trees
Other lawful development applications
In Wandsworth
-
2026/3093 Awaiting decision
208 Franciscan Road SW17 8HG
Lawful development for loft conversion.
-
2026/3014 Withdrawn
1 St Hildas Close SW17 7UL
Installation of new wooden fence and gate to front of property.
-
2026/3006 Awaiting decision
137 Tooting Bec Road SW17 8BW
Erection of a dormer extension to main rear roof slope.
-
2026/2965 Awaiting decision
10 Kenilford Road SW12 9PR
Alterations including erection of mansard roof extension to main rear roof (with French doors and safety railings) including raising the ridge by 700mm and extension above two-storey back addition.
-
2026/2857 Withdrawn
11 Brookwood Road SW18 5BL
Erection of timber framed pergola in rear garden.