Rear Extension approval rate in Hertsmere
Hertsmere approved 83.0% of rear extension applications, based on 924 decisions analysed.
Last updated: March 2026
83.0%
rear extension approval rate
924
Rear Extension decisions
767
Approved
157
Refused
85.1%
Hertsmere overall
Rear Extension applications are refused more often than the Hertsmere average (85.1%), suggesting the council scrutinises these projects more closely.
How rear extension compares in Hertsmere
Rear Extension
83.0%
Hertsmere all applications
85.1%
Planning a rear extension in Hertsmere?
83.0% 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 Hertsmere 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 Hertsmere
86.2%
84.6%
77.3%
82.6%
81.8%
90.8%
80.2%
88.1%
72.6%
85.5%
84.6%
89.5%