Side Extension approval rate in Hertsmere
Hertsmere approved 77.3% of side extension applications, based on 203 decisions analysed.
Last updated: March 2026
77.3%
side extension approval rate
203
Side Extension decisions
157
Approved
46
Refused
85.1%
Hertsmere overall
Side Extension applications are refused more often than the Hertsmere average (85.1%), suggesting the council scrutinises these projects more closely.
How side extension compares in Hertsmere
Side Extension
77.3%
Hertsmere all applications
85.1%
Planning a side extension in Hertsmere?
77.3% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.
✓ Your ward's side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Get Hertsmere Pro Report — £79
✓ Nearest comparable side 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
83.0%
86.2%
84.6%
82.6%
81.8%
90.8%
80.2%
88.1%
72.6%
85.5%
84.6%
89.5%