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Loft Conversion Approval Rates in Horsham

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 Horsham.

233 real decisions·January 2020 to present·Updated March 2026
94.4%
Approval Rate
233
Decisions
220
Approved
13
Refused
94.4% approved. But 13 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 Horsham.

TypeDecisionsRate
Conservatory457
98.2%
Basement32
96.9%
Wraparound Extension314
96.8%
Side Extension1,319
96.3%
Front Extension389
96.1%
Rear Extension2,125
95.3%
Loft Conversion233
94.4%
Dormer661
91.4%
Hip-to-Gable Conversion79
91.1%
Extension (General)430
90.2%
Outbuilding580
89.5%
Garage / Parking2,083
88.3%
Annex144
84.7%
New Build771
78.6%
Flat Conversion30
76.7%
Change of Use (Residential)678
72.9%
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What the data tells us

1
94.4% of loft conversion applications in Horsham get approved. That means 13 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

13 loft conversion applications in Horsham 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 Horsham planning data

Nearby councils loft conversion data

Methodology: Based on 233 planning decisions classified as loft conversions in Horsham, 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 Horsham Council's public planning portal. Full methodology →
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