Side Extension approval rate in Cornwall

Cornwall approved 98.0% of side extension applications, based on 643 decisions analysed.

Last updated: August 2026

98.0%

side extension approval rate

643

Side Extension decisions

630

Approved

Refused

93.0%

Cornwall overall

Side Extension applications are approved more often than the Cornwall average (93.0%), suggesting the council is relatively receptive to these projects.

How side extension compares in Cornwall

Side Extension (643 decided)

98.0%

Cornwall all applications (24,970 decided)

93.0%

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 →