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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 2.4% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

1,647 real decisions·12 project types·Updated June 2026
100.0%
Safest: Loft Conversion
97.6%
Lowest: Extension (General)
2.4%
Spread
12
Types ranked

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All 12 project types ranked

#TypeDecisionsApprovedRefusedRate
1Loft Conversion90900
100.0%
2Dormer97970
100.0%
3Outbuilding58580
100.0%
4Change of Use (Residential)28280
100.0%
5Garage / Parking1841840
100.0%
6Side Extension77770
100.0%
7Front Extension43430
100.0%
8Hip-to-Gable Conversion21210
100.0%
9Conservatory26260
100.0%
10Wraparound Extension25250
100.0%
11Rear Extension2282271
99.6%
12Extension (General)42411
97.6%
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 97.6%.
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What the data tells us

1
The range is massive: 97.6% 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

6 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 1,647 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 present. Full methodology →
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