Rear Extension approval rate in Cardiff
Cardiff approved 67.9% of rear extension applications, based on 364 decisions analysed.
Last updated: June 2026
67.9%
rear extension approval rate
364
Rear Extension decisions
247
Approved
117
Refused
81.7%
Cardiff overall
Rear Extension applications are refused more often than the Cardiff average (81.7%), suggesting the council scrutinises these projects more closely.
How rear extension compares in Cardiff
Rear Extension
67.9%
Cardiff all applications
81.7%
Planning a rear extension in Cardiff?
67.9% 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 rear extension approval rate
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Cardiff →
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Cardiff
66.9%
66.6%
85.6%
70.2%
49.4%
65.6%
77.8%
84.1%
82.8%
78.6%
88.5%
83.3%
71.4%
77.8%