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Most Common Planning Applications in Mid Sussex

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Mid Sussex is 20.9% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

5,410 real decisions·15 project types·Updated September 2026
97.3%
Safest: Conservatory
76.4%
Lowest: New Build
20.9%
Spread
15
Types ranked

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All 15 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory36735710
97.3%
2Front Extension24723611
95.5%
3Rear Extension1,3471,28562
95.4%
4Side Extension77573738
95.1%
5Wraparound Extension103967
93.2%
6Basement29272
93.1%
7Outbuilding47143734
92.8%
8Loft Conversion38035228
92.6%
9Hip-to-Gable Conversion79736
92.4%
10Extension (General)56351944
92.2%
11Garage / Parking1,4981,378120
92.0%
12Dormer51847444
91.5%
13Change of Use (Residential)26223329
88.9%
14Annex766610
86.8%
15New Build17413341
76.4%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 97.3% approval rate. New Build? Just 76.4%.
Check your postcode to see what actually happens near your address.

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What the data tells us

1
The range is massive: 76.4% to 97.3%. 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

371 planning applications in Mid Sussex 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 Mid Sussex planning data

Nearby councils project type rankings

Methodology: Classifies 5,410 decisions in Mid Sussex 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 Mid Sussex Council's public planning portal, January 2020 to September 2026. Full methodology →
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