Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 6,821 real decisions tell us about rear extension outcomes in Sutton.
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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 | Carshalton South & Clockhouse | 7 | 7 | 100.0% |
| 2 | Cheam | 10 | 10 | 100.0% |
| 3 | Stonecot | 6 | 6 | 100.0% |
| 4 | Worcester Park South | 8 | 7 | 87.5% |
| 5 | Carshalton Central | 8 | 7 | 87.5% |
| 6 | Sutton North | 7 | 6 | 85.7% |
| 7 | North Cheam | 12 | 10 | 83.3% |
| 8 | Beddington | 5 | 3 | 60.0% |
A rear extension has a 100.0% approval rate in Carshalton South & Clockhouse but just 60.0% in Beddington.
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 Sutton.
| Type | Decisions | Rate |
|---|---|---|
| Flat Conversion | 912 | 91.8% |
| Extension (General) | 2,069 | 88.4% |
| Conservatory | 410 | 84.1% |
| Basement | 227 | 84.1% |
| Garage / Parking | 3,963 | 82.6% |
| Hip-to-Gable Conversion | 424 | 82.5% |
| Dormer | 2,964 | 82.3% |
| Change of Use (Residential) | 908 | 82.2% |
| Outbuilding | 792 | 81.6% |
| Rear Extension | 6,821 | 79.4% |
| Side Extension | 2,890 | 78.7% |
| Wraparound Extension | 1,004 | 78.3% |
| New Build | 1,030 | 77.5% |
| Loft Conversion | 129 | 77.5% |
| Front Extension | 897 | 77.0% |
| Annex | 149 | 75.2% |
| HMO | 157 | 74.5% |
1,402 rear extension applications in Sutton 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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