Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 1,316 real decisions tell us about rear extension outcomes in Mid Sussex.
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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.
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 Mid Sussex.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 356 | 97.2% |
| Front Extension | 240 | 95.8% |
| Rear Extension | 1,316 | 95.4% |
| Side Extension | 764 | 95.0% |
| Wraparound Extension | 102 | 93.1% |
| Basement | 29 | 93.1% |
| Loft Conversion | 369 | 93.0% |
| Outbuilding | 454 | 92.7% |
| Garage / Parking | 1,461 | 92.1% |
| Hip-to-Gable Conversion | 76 | 92.1% |
| Extension (General) | 551 | 92.0% |
| Dormer | 502 | 91.6% |
| Change of Use (Residential) | 253 | 88.9% |
| Annex | 74 | 86.5% |
| New Build | 173 | 76.3% |
61 rear extension 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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