Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 2,150 real decisions tell us about rear extension outcomes in Horsham.
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Rear extensions sit in the middle of the pack nationally. They're common enough that councils have clear precedent — but that cuts both ways. If your neighbours have been refused, that precedent works against you too.
| # | Ward | Decisions | Approved | Rate |
|---|---|---|---|---|
| 1 | Roffey North | 5 | 4 | 80.0% |
Two houses on the same street can get different outcomes.
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Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Horsham.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 459 | 98.3% |
| Basement | 34 | 97.1% |
| Wraparound Extension | 321 | 96.9% |
| Side Extension | 1,336 | 96.3% |
| Front Extension | 395 | 96.2% |
| Rear Extension | 2,150 | 95.3% |
| Loft Conversion | 236 | 94.5% |
| Dormer | 672 | 91.5% |
| Hip-to-Gable Conversion | 80 | 91.2% |
| Extension (General) | 444 | 90.5% |
| Outbuilding | 592 | 89.7% |
| Garage / Parking | 2,149 | 88.6% |
| Annex | 149 | 85.2% |
| New Build | 785 | 78.9% |
| Flat Conversion | 30 | 76.7% |
| Change of Use (Residential) | 690 | 73.0% |
102 rear extension applications in Horsham 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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