Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 1,934 real decisions tell us about rear extension outcomes in Windsor & Maidenhead.
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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 | Boyn Hill | 5 | 5 | 100.0% |
| 2 | Ascot & Sunninghill | 5 | 5 | 100.0% |
| 3 | Clewer East | 6 | 6 | 100.0% |
| 4 | Furze Platt | 5 | 5 | 100.0% |
| 5 | Cox Green | 5 | 5 | 100.0% |
| 6 | Sunningdale And Cheapside | 9 | 8 | 88.9% |
| 7 | Pinkneys Green | 6 | 5 | 83.3% |
| 8 | Bisham And Cookham | 8 | 6 | 75.0% |
A rear extension has a 100.0% approval rate in Boyn Hill but just 75.0% in Bisham And Cookham.
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 Windsor & Maidenhead.
| Type | Decisions | Rate |
|---|---|---|
| Hip-to-Gable Conversion | 117 | 90.6% |
| Loft Conversion | 253 | 89.3% |
| Basement | 91 | 89.0% |
| Conservatory | 182 | 87.9% |
| Rear Extension | 1,934 | 85.4% |
| Front Extension | 541 | 84.3% |
| Extension (General) | 188 | 84.0% |
| Side Extension | 1,232 | 83.9% |
| Garage / Parking | 1,372 | 82.2% |
| Dormer | 627 | 81.3% |
| New Build | 133 | 81.2% |
| Change of Use (Residential) | 259 | 80.3% |
| Outbuilding | 460 | 79.6% |
| Wraparound Extension | 117 | 76.1% |
| Annex | 35 | 71.4% |
282 rear extension applications in Windsor & Maidenhead 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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