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Most Common Planning Applications in St Helens

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

283 real decisions·7 project types·Updated September 2026
Safest: Rear Extension
Lowest: Dormer
Spread
7
Types ranked

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All 7 project types ranked

#TypeDecisionsApprovedRefusedRate
1Rear Extension107
2Conservatory26
3Garage / Parking70
4Side Extension64
5Change of Use (Residential)47
6Extension (General)22
7Dormer24
See how this applies to your postcode →

These are council averages. Your property is specific.

A rear extension application has a – approval rate. Dormer? Just –.
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What the data tells us

1
The range is massive: – to –. 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

– planning applications in St Helens 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 St Helens planning data

Methodology: Classifies 283 decisions in St Helens 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 St Helens Council's public planning portal, January 2020 to September 2026. Full methodology →
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