Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 1,206 real decisions tell us about rear extension outcomes in Hertsmere.
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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 | Potters Bar Oakmere | 5 | 5 | 100.0% |
| 2 | Aldenham East | 7 | 7 | 100.0% |
| 3 | Potters Bar Parkfield | 7 | 7 | 100.0% |
| 4 | Bushey North | 6 | 6 | 100.0% |
| 5 | Bentley Heath & The Royds | 9 | 6 | 66.7% |
A rear extension has a 100.0% approval rate in Potters Bar Oakmere but just 66.7% in Bentley Heath & The Royds.
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Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Hertsmere.
| Type | Decisions | Rate |
|---|---|---|
| HMO | 21 | 100.0% |
| Flat Conversion | 22 | 100.0% |
| Front Extension | 151 | 94.7% |
| Wraparound Extension | 103 | 94.2% |
| Basement | 31 | 93.5% |
| Hip-to-Gable Conversion | 137 | 92.7% |
| Garage / Parking | 494 | 90.7% |
| Dormer | 475 | 90.7% |
| Extension (General) | 73 | 89.0% |
| Change of Use (Residential) | 63 | 88.9% |
| Outbuilding | 143 | 88.1% |
| Conservatory | 153 | 86.9% |
| Side Extension | 330 | 86.1% |
| Rear Extension | 1,206 | 86.0% |
| Loft Conversion | 94 | 83.0% |
| New Build | 91 | 81.3% |
169 rear extension applications in Hertsmere 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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