Dormer approval rate in Hertsmere
Hertsmere approved 91.6% of dormer applications, based on 524 decisions analysed.
Last updated: September 2026
91.6%
dormer approval rate
524
Dormer decisions
480
Approved
44
Refused
87.5%
Hertsmere overall
Dormer applications are approved more often than the Hertsmere average (87.5%), suggesting the council is relatively receptive to these projects.
How dormer compares in Hertsmere
Dormer
91.6%
Hertsmere all applications
87.5%
Planning a dormer in Hertsmere?
91.6% 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 dormer approval rate
✓ Nearest comparable dormer decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Hertsmere →
✓ Nearest comparable dormer decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Planning professional? PlanningLens runs refusal alerts and evidence packs for Hertsmere and any other published UK council — see the data services →
Other project types in Hertsmere
86.6%
91.8%
87.9%
89.7%
88.3%
95.2%
93.2%
95.3%
82.8%
83.3%
89.7%
100.0%
93.8%
100.0%
100.0%