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Most Common Planning Applications in Islington

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Islington is 33.5% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

85,229 real decisions·17 project types·Updated March 2026
86.0%
Safest: Conservatory
52.5%
Lowest: Hip-to-Gable Conversion
33.5%
Spread
17
Types ranked

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All 17 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory1,6641,431233
86.0%
2Outbuilding1,4841,261223
85.0%
3Wraparound Extension22018238
82.7%
4Basement10,6388,7491,889
82.2%
5Rear Extension11,6609,4052,255
80.7%
6Extension (General)5,8234,6921,131
80.6%
7Side Extension1,9221,536386
79.9%
8Front Extension13110427
79.4%
9Annex886919
78.4%
10HMO31324271
77.3%
11Change of Use (Residential)8,1286,2551,873
77.0%
12Dormer3,4872,663824
76.4%
13Garage / Parking3,0712,236835
72.8%
14New Build2,0731,484589
71.6%
15Loft Conversion6,0494,0651,984
67.2%
16Flat Conversion1,415950465
67.1%
17Hip-to-Gable Conversion402119
52.5%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 86.0% approval rate. Hip-to-Gable Conversion? Just 52.5%.
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What the data tells us

1
The range is massive: 52.5% to 86.0%. 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

14,676 planning applications in Islington have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A £79 report shows you what gets approved — and what gets refused — near your property.

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More Islington planning data

Nearby councils project type rankings

Methodology: Classifies 85,229 decisions in Islington 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 Islington Council's public planning portal, January 2020 to present. Full methodology →
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