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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.

329 real decisions·January 2020 to present·Updated March 2026
93.3%
Approval Rate
329
Decisions
307
Approved
22
Refused
93.3% approved. But 22 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.
Check your postcode to see what actually happens near your address.

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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
Conservatory321
96.9%
Front Extension220
96.4%
Rear Extension1,182
95.9%
Side Extension676
95.3%
Wraparound Extension85
95.3%
Outbuilding400
94.5%
Loft Conversion329
93.3%
Basement28
92.9%
Hip-to-Gable Conversion67
92.5%
Extension (General)505
92.3%
Garage / Parking1,307
92.2%
Dormer460
92.2%
Change of Use (Residential)236
89.4%
Annex62
85.5%
New Build161
75.8%
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What the data tells us

1
93.3% of loft conversion applications in Mid Sussex get approved. That means 22 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

22 loft conversion applications in Mid Sussex 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 Mid Sussex planning data

Nearby councils loft conversion data

Methodology: Based on 329 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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