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Most Common Planning Applications in Sefton

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Sefton is 69.6% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

6,655 real decisions·17 project types·Updated June 2026
100.0%
Safest: Wraparound Extension
30.4%
Lowest: HMO
69.6%
Spread
17
Types ranked

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All 17 project types ranked

#TypeDecisionsApprovedRefusedRate
1Wraparound Extension35350
100.0%
2Hip-to-Gable Conversion40400
100.0%
3Conservatory3693609
97.6%
4Side Extension1781708
95.5%
5Annex40382
95.0%
6Loft Conversion68644
94.1%
7Extension (General)1,7941,675119
93.4%
8Front Extension29272
93.1%
9Dormer45041535
92.2%
10Garage / Parking86378875
91.3%
11Outbuilding27825127
90.3%
12Rear Extension46041149
89.3%
13Basement39345
87.2%
14New Build32127249
84.7%
15Flat Conversion806020
75.0%
16Change of Use (Residential)491349142
71.1%
17HMO561739
30.4%
See how this applies to your postcode →

These are council averages. Your property is specific.

A wraparound extension application has a 100.0% approval rate. HMO? Just 30.4%.
Check your postcode to see what actually happens near your address.

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What the data tells us

1
The range is massive: 30.4% 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

834 planning applications in Sefton 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 Sefton planning data

Nearby councils project type rankings

Methodology: Classifies 6,655 decisions in Sefton 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 Sefton Council's public planning portal, January 2020 to present. Full methodology →
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