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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 32.2% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

69,305 real decisions·17 project types·Updated September 2026
85.9%
Safest: Conservatory
53.7%
Lowest: Hip-to-Gable Conversion
32.2%
Spread
17
Types ranked

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All 17 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory1,6701,435235
85.9%
2Outbuilding1,5061,287219
85.5%
3Wraparound Extension22418638
83.0%
4Basement10,6798,7981,881
82.4%
5Rear Extension11,7009,4502,250
80.8%
6Extension (General)5,8124,6871,125
80.6%
7Side Extension1,9341,552382
80.2%
8Front Extension13010327
79.2%
9Annex907119
78.9%
10Change of Use (Residential)8,1316,2641,867
77.0%
11Dormer3,5052,684821
76.6%
12HMO32224478
75.8%
13Garage / Parking3,0872,253834
73.0%
14New Build2,0771,488589
71.6%
15Loft Conversion6,0794,0911,988
67.3%
16Flat Conversion1,425958467
67.2%
17Hip-to-Gable Conversion412219
53.7%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 85.9% approval rate. Hip-to-Gable Conversion? Just 53.7%.
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What the data tells us

1
The range is massive: 53.7% to 85.9%. 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

12,220 planning applications in Islington 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 Islington planning data

Nearby councils project type rankings

Methodology: Classifies 69,305 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 September 2026. Full methodology →
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