Annex approval rate in Cardiff
Cardiff approved 78.3% of annex applications, based on 23 decisions analysed.
Last updated: March 2026
78.3%
annex approval rate
23
Annex decisions
18
Approved
5
Refused
81.9%
Cardiff overall
Annex applications are refused more often than the Cardiff average (81.9%), suggesting the council scrutinises these projects more closely.
How annex compares in Cardiff
Annex
78.3%
Cardiff all applications
81.9%
Planning a annex in Cardiff?
78.3% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.
✓ Your ward's annex approval rate
✓ Nearest comparable annex decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Get Cardiff Pro Report — £79
✓ Nearest comparable annex 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%
63.0%
67.1%
48.8%
92.3%
70.1%
59.3%
77.4%
91.7%
90.9%
94.4%
86.7%
80.0%