Data-backed planning intelligence · 3,770,000+ decisions analysed across England

Most Common Planning Applications in North Hertfordshire

Not all planning applications are created equal. The gap between the highest and lowest approval project type in North Hertfordshire is 10.9% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

2,079 real decisions·14 project types·Updated August 2026
93.9%
Safest: Side Extension
83.0%
Lowest: New Build
10.9%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Side Extension23021614
93.9%
2Outbuilding1481399
93.9%
3Rear Extension41839226
93.8%
4Conservatory97916
93.8%
5Wraparound Extension33303
90.9%
6Front Extension11710611
90.6%
7Garage / Parking36533035
90.4%
8Change of Use (Residential)70637
90.0%
9Loft Conversion81729
88.9%
10Dormer13211715
88.6%
11Hip-to-Gable Conversion24213
87.5%
12Annex27234
85.2%
13Extension (General)42357
83.3%
14New Build14712225
83.0%
See how this applies to your postcode →

These are council averages. Your property is specific.

A side extension application has a 93.9% approval rate. New Build? Just 83.0%.
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What the data tells us

1
The range is massive: 83.0% to 93.9%. Choosing the right project type — or framing your application correctly — can dramatically affect outcomes.
2
Visibility drives scrutiny. Project types that change the external appearance — dormers, loft conversions, hip-to-gable — face more resistance than those that don't. The more visible your proposal, the more carefully it needs designing.
3
These are council-wide averages. Your ward, your street and your immediate neighbours all shift the odds. The comparable decisions near your property are the best indicator of outcome.

Before you spend £5,000+ on architects and drawings

128 planning applications in North Hertfordshire have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A free, property-specific report shows you what gets approved — and what gets refused — near your property.

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More North Hertfordshire planning data

Methodology: Classifies 2,079 decisions in North Hertfordshire into residential project types using keyword matching against proposal descriptions (matching generate_site_data.py subtype rules). A single application may appear in multiple categories. Data from North Hertfordshire Council's public planning portal, January 2020 to August 2026. Full methodology →
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