Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 8,150 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 Giles and Little Chalfont | 6 | 6 | 100.0% |
| 2 | Iver | 5 | 5 | 100.0% |
| 3 | Marlow | 5 | 4 | 80.0% |
A rear extension has a 100.0% approval rate in Chalfont St Giles and Little Chalfont but just 80.0% in Marlow.
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Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Buckinghamshire.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 997 | 90.1% |
| Wraparound Extension | 788 | 89.2% |
| Front Extension | 2,362 | 89.1% |
| Side Extension | 4,582 | 88.3% |
| Basement | 264 | 88.3% |
| Rear Extension | 8,150 | 87.7% |
| Hip-to-Gable Conversion | 460 | 84.8% |
| Dormer | 2,775 | 84.5% |
| Loft Conversion | 1,742 | 84.2% |
| Garage / Parking | 6,040 | 83.8% |
| Extension (General) | 959 | 83.2% |
| Annex | 255 | 82.7% |
| Outbuilding | 1,932 | 82.0% |
| Flat Conversion | 146 | 79.5% |
| New Build | 1,361 | 76.9% |
| Change of Use (Residential) | 1,097 | 76.1% |
| HMO | 89 | 69.7% |
1,004 rear extension applications in Buckinghamshire 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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