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Loft Conversion Approval Rates in Croydon

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 Croydon.

2,549 real decisions·January 2020 to present·Updated March 2026
75.8%
Approval Rate
2,549
Decisions
1,933
Approved
616
Refused
75.8% approved. But 616 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.

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 Croydon.

TypeDecisionsRate
Conservatory604
84.9%
Extension (General)1,739
81.4%
Rear Extension10,142
81.1%
Front Extension1,008
79.5%
Basement1,704
79.5%
Side Extension4,960
79.4%
Dormer4,807
79.2%
New Build5,099
78.2%
Garage / Parking10,172
77.8%
Wraparound Extension982
77.6%
Hip-to-Gable Conversion1,267
76.6%
Loft Conversion2,549
75.8%
Outbuilding1,457
74.1%
Annex208
71.2%
Change of Use (Residential)1,701
60.6%
Flat Conversion613
49.4%
HMO678
49.4%
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What the data tells us

1
75.8% of loft conversion applications in Croydon get approved. That means 616 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

616 loft conversion applications in Croydon 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 Croydon planning data

Nearby councils loft conversion data

Methodology: Based on 2,549 planning decisions classified as loft conversions in Croydon, 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 Croydon Council's public planning portal. Full methodology →
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