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Loft Conversion Approval Rates in Mid Sussex

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 Mid Sussex.

357 real decisions·January 2020 to present·Updated June 2026
93.3%
Approval Rate
357
Decisions
333
Approved
24
Refused
93.3% approved. But 24 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 Mid Sussex.

TypeDecisionsRate
Conservatory344
97.1%
Front Extension234
96.2%
Rear Extension1,282
95.5%
Side Extension734
95.1%
Wraparound Extension96
93.8%
Outbuilding442
93.4%
Loft Conversion357
93.3%
Basement29
93.1%
Extension (General)536
92.2%
Garage / Parking1,425
92.0%
Hip-to-Gable Conversion72
91.7%
Dormer494
91.5%
Change of Use (Residential)245
89.0%
Annex70
87.1%
New Build169
76.3%
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What the data tells us

1
93.3% of loft conversion applications in Mid Sussex get approved. That means 24 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

24 loft conversion applications in Mid Sussex 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 Mid Sussex planning data

Nearby councils loft conversion data

Methodology: Based on 357 planning decisions classified as loft conversions in Mid Sussex, 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 Mid Sussex Council's public planning portal. Full methodology →
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