Data-backed planning intelligence · 3,780,000+ 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 13.1% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

40,184 real decisions·16 project types·Updated August 2026
97.0%
Safest: Flat Conversion
83.9%
Lowest: New Build
13.1%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Flat Conversion66642
97.0%
2Conservatory1,3581,31444
96.8%
3Rear Extension5,5125,330182
96.7%
4Loft Conversion26625511
95.9%
5Side Extension3,3003,137163
95.1%
6Extension (General)2,2072,097110
95.0%
7Wraparound Extension59056030
94.9%
8Front Extension1,1351,07659
94.8%
9Outbuilding1,8601,754106
94.3%
10Basement1191127
94.1%
11Dormer90184556
93.8%
12HMO27252
92.6%
13Garage / Parking5,6445,108536
90.5%
14Annex55950356
90.0%
15Change of Use (Residential)2,1461,876270
87.4%
16New Build1,4471,214233
83.9%
See how this applies to your postcode →

These are council averages. Your property is specific.

A flat conversion application has a 97.0% approval rate. New Build? Just 83.9%.
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What the data tells us

1
The range is massive: 83.9% to 97.0%. 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

2,552 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 40,184 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 August 2026. Full methodology →
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