Side Extension approval rate in Cornwall
Cornwall approved 98.0% of side extension applications, based on 653 decisions analysed.
Last updated: September 2026
98.0%
side extension approval rate
653
Side Extension decisions
640
Approved
13
Refused
92.4%
Cornwall overall
Side Extension applications are approved more often than the Cornwall average (92.4%), suggesting the council is relatively receptive to these projects.
How side extension compares in Cornwall
Side Extension
98.0%
Cornwall all applications
92.4%
Planning a side extension in Cornwall?
98.0% 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 Cornwall →
✓ 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 Cornwall and any other published UK council — see the data services →
Other project types in Cornwall
95.9%
94.0%
94.5%
97.1%
83.0%
95.3%
96.4%
97.3%
93.2%
93.7%
97.5%
98.6%
93.8%
93.5%
82.4%