Data-backed planning intelligence · 3,290,000+ decisions analysed across England

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 20.8% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

8,479 real decisions·15 project types·Updated June 2026
97.1%
Safest: Conservatory
76.3%
Lowest: New Build
20.8%
Spread
15
Types ranked

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All 15 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory34433410
97.1%
2Front Extension2342259
96.2%
3Rear Extension1,2821,22458
95.5%
4Side Extension73469836
95.1%
5Wraparound Extension96906
93.8%
6Outbuilding44241329
93.4%
7Loft Conversion35733324
93.3%
8Basement29272
93.1%
9Extension (General)53649442
92.2%
10Garage / Parking1,4251,311114
92.0%
11Hip-to-Gable Conversion72666
91.7%
12Dormer49445242
91.5%
13Change of Use (Residential)24521827
89.0%
14Annex70619
87.1%
15New Build16912940
76.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 97.1% approval rate. New Build? Just 76.3%.
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What the data tells us

1
The range is massive: 76.3% to 97.1%. 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

516 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 8,479 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 present. Full methodology →
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