Data-backed planning intelligence · 3,700,000+ decisions analysed across England, Scotland, Wales and Northern Ireland

Outbuilding approval rate in Hertsmere

Hertsmere approved 89.1% of outbuilding applications, based on 156 decisions analysed.

Last updated: August 2026

89.1%
outbuilding approval rate
156
Outbuilding decisions
139
Approved
17
Refused
87.8%
Hertsmere overall

Outbuilding applications are approved at roughly the same rate as the Hertsmere average (87.8%).

How outbuilding compares in Hertsmere

Outbuilding (156 decided)
89.1%
Hertsmere all applications (4,144 decided)
87.8%

Planning a outbuilding in Hertsmere?

89.1% 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 outbuilding approval rate
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✓ Refusal triggers specific to your area
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Other project types in Hertsmere

Rear Extension (1,283 decided)
86.6%
Garage / Parking (537 decided)
91.4%
Dormer (501 decided)
91.2%
Side Extension (360 decided)
87.2%
Conservatory (165 decided)
87.9%
Front Extension (160 decided)
95.0%
92.9%
Wraparound Extension (116 decided)
94.8%
New Build (97 decided)
82.5%
Loft Conversion (95 decided)
83.2%
Extension (General) (75 decided)
89.3%
90.1%
Basement (32 decided)
93.8%
Flat Conversion (27 decided)
100.0%
HMO (25 decided)
100.0%
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