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 16.7% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

14,427 real decisions·14 project types·Updated June 2026
100.0%
Safest: Flat Conversion
83.3%
Lowest: Change of Use (Residential)
16.7%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Flat Conversion27270
100.0%
2Conservatory4394336
98.6%
3Rear Extension2,0001,94951
97.5%
4Front Extension45243814
96.9%
5Side Extension1,1861,14442
96.5%
6Wraparound Extension2532449
96.4%
7Dormer31430113
95.9%
8Loft Conversion73703
95.9%
9Extension (General)50648521
95.8%
10Outbuilding62659333
94.7%
11Basement48453
93.8%
12Garage / Parking1,8961,736160
91.6%
13Annex21519619
91.2%
14Change of Use (Residential)618515103
83.3%
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 83.3%.
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What the data tells us

1
The range is massive: 83.3% 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

799 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 14,427 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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