Rear Extension approval rate in Cardiff
Cardiff approved 63.0% of rear extension applications, based on 265 decisions analysed.
Last updated: March 2026
63.0%
rear extension approval rate
265
Rear Extension decisions
167
Approved
98
Refused
81.9%
Cardiff overall
Rear Extension applications are refused more often than the Cardiff average (81.9%), suggesting the council scrutinises these projects more closely.
How rear extension compares in Cardiff
Rear Extension
63.0%
Cardiff all applications
81.9%
Planning a rear extension in Cardiff?
63.0% get approved — but the odds vary by street. Your Pro Report 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
Get Cardiff Pro Report — £79
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Less than one set of revised drawings.
Other project types in Cardiff
66.8%
67.1%
48.8%
92.3%
70.1%
59.3%
77.4%
91.7%
78.3%
90.9%
94.4%
86.7%
80.0%