Side Extension approval rate in Merton
Merton approved 85.2% of side extension applications, based on 1,985 decisions analysed.
Last updated: September 2026
85.2%
side extension approval rate
1,985
Side Extension decisions
1,691
Approved
294
Refused
86.1%
Merton overall
Side Extension applications are approved at roughly the same rate as the Merton average (86.1%).
How side extension compares in Merton
Side Extension
85.2%
Merton all applications
86.1%
Planning a side extension in Merton?
85.2% get approved, but the odds vary by street. Your Full Planning Analysis shows exactly what gets approved and refused near your property.
✓ Your ward's side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Merton →
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Planning professional? PlanningLens runs refusal alerts and evidence packs for Merton and any other published UK council — see the data services →
Other project types in Merton
81.9%
90.0%
88.7%
88.7%
87.8%
86.9%
83.2%
87.2%
83.1%
91.4%
88.8%
92.8%
79.1%
56.4%
79.2%