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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 14.1% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

1,524 real decisions·14 project types·Updated June 2026
93.9%
Safest: Rear Extension
79.8%
Lowest: New Build
14.1%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Rear Extension31029119
93.9%
2Side Extension17015911
93.5%
3Conservatory74695
93.2%
4Wraparound Extension27252
92.6%
5Outbuilding104968
92.3%
6Change of Use (Residential)50464
92.0%
7Front Extension86788
90.7%
8Loft Conversion61556
90.2%
9Hip-to-Gable Conversion20182
90.0%
10Garage / Parking27524728
89.8%
11Dormer938310
89.2%
12Annex24204
83.3%
13Extension (General)34286
82.4%
14New Build1098722
79.8%
See how this applies to your postcode →

These are council averages. Your property is specific.

A rear extension application has a 93.9% approval rate. New Build? Just 79.8%.
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What the data tells us

1
The range is massive: 79.8% 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

101 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 1,524 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 present. Full methodology →
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