Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 9,930 real decisions tell us about rear extension outcomes in Hillingdon.
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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 | BELMORE 2022 | 7 | 7 | 100.0% |
| 2 | PINKWELL 2022 | 5 | 5 | 100.0% |
| 3 | RUISLIP 2022 | 5 | 5 | 100.0% |
| 4 | HILLINGDON EAST 2022 | 5 | 5 | 100.0% |
| 5 | ICK/HAM & S HF/D 22 | 5 | 5 | 100.0% |
| 6 | EASTCOTE 2022 | 8 | 7 | 87.5% |
| 7 | WOOD END 2022 | 7 | 5 | 71.4% |
A rear extension has a 100.0% approval rate in BELMORE 2022 but just 71.4% in WOOD END 2022.
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 Hillingdon.
| Type | Decisions | Rate |
|---|---|---|
| Basement | 478 | 84.1% |
| Hip-to-Gable Conversion | 2,238 | 83.6% |
| Extension (General) | 1,957 | 83.0% |
| Conservatory | 832 | 81.9% |
| Garage / Parking | 7,547 | 80.9% |
| New Build | 1,644 | 80.0% |
| Outbuilding | 2,572 | 80.0% |
| Dormer | 4,830 | 78.4% |
| Rear Extension | 9,930 | 77.6% |
| Wraparound Extension | 947 | 75.8% |
| Change of Use (Residential) | 1,439 | 74.8% |
| Loft Conversion | 475 | 73.7% |
| Flat Conversion | 914 | 73.0% |
| Side Extension | 4,767 | 70.9% |
| Front Extension | 1,057 | 65.5% |
| HMO | 319 | 59.6% |
| Annex | 125 | 40.8% |
2,229 rear extension applications in Hillingdon 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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