Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 8,065 real decisions tell us about rear extension outcomes in Buckinghamshire.
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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 | Chalfont St Peter | 7 | 6 | 85.7% |
| 2 | Chalfont St Giles and Little Chalfont | 5 | 4 | 80.0% |
A rear extension has a 85.7% approval rate in Chalfont St Peter but just 80.0% in Chalfont St Giles and Little Chalfont.
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 Buckinghamshire.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 984 | 89.9% |
| Wraparound Extension | 784 | 89.2% |
| Front Extension | 2,338 | 89.0% |
| Basement | 264 | 88.3% |
| Side Extension | 4,548 | 88.2% |
| Rear Extension | 8,065 | 87.6% |
| Hip-to-Gable Conversion | 458 | 84.7% |
| Dormer | 2,756 | 84.4% |
| Loft Conversion | 1,728 | 84.0% |
| Garage / Parking | 5,995 | 83.7% |
| Extension (General) | 947 | 83.0% |
| Annex | 253 | 82.6% |
| Outbuilding | 1,920 | 82.0% |
| Flat Conversion | 146 | 79.5% |
| New Build | 1,352 | 76.8% |
| Change of Use (Residential) | 1,090 | 76.1% |
| HMO | 88 | 69.3% |
997 rear extension applications in Buckinghamshire 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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