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Loft Conversion Approval Rates in Islington

Loft conversions change your roofline — and that makes them one of the more closely scrutinised application types. Councils scrutinise visibility, overlooking and street character more closely than for ground-level work. Here's what the data shows in Islington.

6,049 real decisions·January 2020 to present·Updated March 2026
67.2%
Approval Rate
6,049
Decisions
4,065
Approved
1,984
Refused
67.2% approved. But 1,984 refused since 2020. Each refusal cost the homeowner time and money on drawings and application fees. Understanding your local data before you apply is the difference between confidence and a costly gamble.

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Why loft conversion approval rates matter

Loft conversions face more scrutiny than rear or side extensions because they change the property's profile from the street. Dormers, mansards and hip-to-gable alterations are particularly sensitive.

Loft Conversion approval rate by ward

#WardDecisionsApprovedRate
1Unknown1210
83.3%
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These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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How loft conversions compare to other project types

Not all applications are treated equally. Here's how loft conversions stack up against other common projects in Islington.

TypeDecisionsRate
Conservatory1,664
86.0%
Outbuilding1,484
85.0%
Wraparound Extension220
82.7%
Basement10,638
82.2%
Rear Extension11,660
80.7%
Extension (General)5,823
80.6%
Side Extension1,922
79.9%
Front Extension131
79.4%
Annex88
78.4%
HMO313
77.3%
Change of Use (Residential)8,128
77.0%
Dormer3,487
76.4%
Garage / Parking3,071
72.8%
New Build2,073
71.6%
Loft Conversion6,049
67.2%
Flat Conversion1,415
67.1%
Hip-to-Gable Conversion40
52.5%
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What the data tells us

1
67.2% of loft conversion applications in Islington get approved. That means 1,984 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
3
Council averages are starting points, not guarantees. The decisions that matter most are the comparable ones near your specific property — because planning officers look at precedent, character and the immediate context of your street.

Before you spend £5,000+ on architects and drawings

1,984 loft conversion 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 loft conversion data

Methodology: Based on 6,049 planning decisions classified as loft conversions in Islington, January 2020 to present. Classification uses keyword matching against proposal descriptions (matching generate_site_data.py rules). A single application may appear in multiple categories. Approval rate = approved / (approved + refused). Pending, withdrawn and invalid applications excluded. Data from Islington Council's public planning portal. Full methodology →
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