Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 3,847 real decisions tell us about rear extension outcomes in Brentwood.
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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 | Blackmore And Doddinghurst | 5 | 5 | 100.0% |
| 2 | Shenfield | 8 | 8 | 100.0% |
| 3 | Ingatestone, Fryerning And Mountnessing | 5 | 5 | 100.0% |
| 4 | Herongate, Ingrave And West Horndon | 10 | 10 | 100.0% |
| 5 | Pilgrims Hatch | 6 | 6 | 100.0% |
| 6 | Brentwood West | 5 | 4 | 80.0% |
| 7 | Hutton North | 5 | 4 | 80.0% |
| 8 | Hutton South | 6 | 4 | 66.7% |
A rear extension has a 100.0% approval rate in Blackmore And Doddinghurst but just 66.7% in Hutton South.
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Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Brentwood.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 750 | 86.4% |
| Extension (General) | 438 | 84.2% |
| Rear Extension | 3,847 | 84.1% |
| Garage / Parking | 3,235 | 83.5% |
| Front Extension | 963 | 83.3% |
| Side Extension | 2,205 | 82.4% |
| Annex | 196 | 81.6% |
| Outbuilding | 744 | 80.9% |
| Basement | 167 | 80.8% |
| Wraparound Extension | 403 | 79.9% |
| Hip-to-Gable Conversion | 266 | 78.9% |
| Change of Use (Residential) | 391 | 77.5% |
| New Build | 331 | 77.0% |
| Dormer | 1,425 | 73.9% |
| Loft Conversion | 545 | 71.6% |
| Flat Conversion | 43 | 67.4% |
611 rear extension applications in Brentwood 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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