Data-backed planning intelligence · 3,200,000+ decisions analysed across England, Scotland, Wales and Northern Ireland

Outbuilding approval rate in Hertsmere

Hertsmere approved 88.1% of outbuilding applications, based on 143 decisions analysed.

Last updated: June 2026

88.1%
outbuilding approval rate
143
Outbuilding decisions
126
Approved
17
Refused
87.4%
Hertsmere overall

Outbuilding applications are approved at roughly the same rate as the Hertsmere average (87.4%).

How outbuilding compares in Hertsmere

Outbuilding (143 decided)
88.1%
Hertsmere all applications (3,948 decided)
87.4%

Planning a outbuilding in Hertsmere?

88.1% 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 (1,206 decided)
86.0%
Garage / Parking (494 decided)
90.7%
Dormer (475 decided)
90.7%
Side Extension (330 decided)
86.1%
Conservatory (153 decided)
86.9%
Front Extension (151 decided)
94.7%
92.7%
Wraparound Extension (103 decided)
94.2%
Loft Conversion (94 decided)
83.0%
New Build (91 decided)
81.3%
Extension (General) (73 decided)
89.0%
88.9%
Basement (31 decided)
93.5%
Flat Conversion (22 decided)
100.0%
HMO (21 decided)
100.0%
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