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Most Common Planning Applications in Dacorum

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Dacorum is 1.8% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

2,049 real decisions·12 project types·Updated August 2026
100.0%
Safest: Loft Conversion
98.2%
Lowest: Extension (General)
1.8%
Spread
12
Types ranked

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All 12 project types ranked

#TypeDecisionsApprovedRefusedRate
1Loft Conversion1031030
100.0%
2Dormer1181180
100.0%
3Outbuilding76760
100.0%
4Change of Use (Residential)41410
100.0%
5Garage / Parking2312310
100.0%
6Side Extension1191190
100.0%
7Front Extension55550
100.0%
8Hip-to-Gable Conversion25250
100.0%
9Conservatory38380
100.0%
10Wraparound Extension33330
100.0%
11Rear Extension2972943
99.0%
12Extension (General)56551
98.2%
See how this applies to your postcode →

These are council averages. Your property is specific.

A loft conversion application has a 100.0% approval rate. Extension (General)? Just 98.2%.
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What the data tells us

1
The range is massive: 98.2% to 100.0%. 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

8 planning applications in Dacorum 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 Dacorum planning data

Methodology: Classifies 2,049 decisions in Dacorum 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 Dacorum Council's public planning portal, January 2020 to August 2026. Full methodology →
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