Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 26,504 real decisions tell us about rear extension outcomes in Hounslow.
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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 | Chiswick Riverside | 5 | 5 | 100.0% |
| 2 | Hounslow South | 5 | 5 | 100.0% |
| 3 | Feltham North | 6 | 5 | 83.3% |
| 4 | Osterley & Spring Grove | 12 | 10 | 83.3% |
| 5 | Hanworth Park | 6 | 5 | 83.3% |
| 6 | Chiswick Gunnersbury | 5 | 4 | 80.0% |
| 7 | Heston Central | 8 | 5 | 62.5% |
| 8 | Feltham West | 5 | 3 | 60.0% |
| 9 | Hanworth Village | 6 | 3 | 50.0% |
A rear extension has a 100.0% approval rate in Chiswick Riverside but just 50.0% in Hanworth Village.
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Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Hounslow.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 1,925 | 95.0% |
| Extension (General) | 3,033 | 92.9% |
| Dormer | 1,373 | 90.5% |
| New Build | 4,779 | 90.0% |
| Loft Conversion | 12,007 | 89.7% |
| Basement | 1,485 | 89.0% |
| Wraparound Extension | 1,494 | 88.9% |
| Garage / Parking | 8,713 | 88.6% |
| Side Extension | 7,753 | 88.1% |
| Hip-to-Gable Conversion | 3,244 | 85.4% |
| Rear Extension | 26,504 | 84.9% |
| Front Extension | 1,034 | 83.0% |
| Change of Use (Residential) | 3,085 | 82.7% |
| Outbuilding | 4,154 | 80.6% |
| Flat Conversion | 1,402 | 72.9% |
| Annex | 110 | 66.4% |
| HMO | 338 | 49.7% |
3,993 rear extension applications in Hounslow 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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