Rear Extension approval rate in Hertsmere
Hertsmere approved 86.6% of rear extension applications, based on 1,283 decisions analysed.
Last updated: August 2026
86.6%
rear extension approval rate
1,283
Rear Extension decisions
1,111
Approved
172
Refused
87.8%
Hertsmere overall
Rear Extension applications are approved at roughly the same rate as the Hertsmere average (87.8%).
How rear extension compares in Hertsmere
Rear Extension
86.6%
Hertsmere all applications
87.8%
Planning a rear extension in Hertsmere?
86.6% 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 Hertsmere →
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Hertsmere
91.4%
91.2%
87.2%
87.9%
95.0%
89.1%
92.9%
94.8%
82.5%
83.2%
89.3%
93.8%
100.0%
100.0%