Data-backed planning intelligence · 3,230,000+ decisions analysed across England

Most Common Planning Applications in West Suffolk

Not all planning applications are created equal. The gap between the highest and lowest approval project type in West Suffolk is 16.9% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

14,250 real decisions·14 project types·Updated June 2026
100.0%
Safest: Flat Conversion
83.1%
Lowest: Change of Use (Residential)
16.9%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Flat Conversion27270
100.0%
2Conservatory4334276
98.6%
3Rear Extension1,9771,92849
97.5%
4Front Extension44743314
96.9%
5Side Extension1,1681,12642
96.4%
6Wraparound Extension2492409
96.4%
7Loft Conversion73703
95.9%
8Extension (General)50047921
95.8%
9Dormer31229913
95.8%
10Outbuilding61658432
94.8%
11Basement47443
93.6%
12Garage / Parking1,8711,716155
91.7%
13Annex21219319
91.0%
14Change of Use (Residential)609506103
83.1%
See how this applies to your postcode →

These are council averages. Your property is specific.

A flat conversion application has a 100.0% approval rate. Change of Use (Residential)? Just 83.1%.
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What the data tells us

1
The range is massive: 83.1% 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

786 planning applications in West Suffolk 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 West Suffolk planning data

Methodology: Classifies 14,250 decisions in West Suffolk 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 West Suffolk Council's public planning portal, January 2020 to present. Full methodology →
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