Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 924 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 | Borehamwood Hillside | 8 | 8 | 100.0% |
| 2 | Bushey Park | 8 | 8 | 100.0% |
| 3 | Borehamwood Kenilworth | 9 | 8 | 88.9% |
| 4 | Borehamwood Cowley Hill | 8 | 7 | 87.5% |
| 5 | Potters Bar Parkfield | 7 | 6 | 85.7% |
| 6 | Borehamwood Brookmeadow | 13 | 11 | 84.6% |
| 7 | Bushey North | 5 | 4 | 80.0% |
| 8 | Potters Bar Furzefield | 11 | 8 | 72.7% |
| 9 | Shenley | 5 | 3 | 60.0% |
| 10 | Bentley Heath & The Royds | 19 | 9 | 47.4% |
| 11 | Potters Bar Oakmere | 11 | 4 | 36.4% |
A rear extension has a 100.0% approval rate in Borehamwood Hillside but just 36.4% in Potters Bar Oakmere.
Check your postcode to see what actually happens near your address.
Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Hertsmere.
| Type | Decisions | Rate |
|---|---|---|
| Front Extension | 87 | 90.8% |
| Hip-to-Gable Conversion | 84 | 88.1% |
| Dormer | 318 | 86.2% |
| Extension (General) | 55 | 85.5% |
| Garage / Parking | 298 | 84.6% |
| Wraparound Extension | 39 | 84.6% |
| Rear Extension | 924 | 83.0% |
| Conservatory | 109 | 82.6% |
| Loft Conversion | 88 | 81.8% |
| Outbuilding | 86 | 80.2% |
| Side Extension | 203 | 77.3% |
| Change of Use (Residential) | 24 | 75.0% |
| New Build | 62 | 72.6% |
157 rear extension applications in Hertsmere 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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