Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 2,254 real decisions tell us about rear extension outcomes in Portsmouth.
See your ward's approval rate and nearby planning decisions — free and instant.
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 | Copnor | 5 | 5 | 100.0% |
| 2 | Baffins | 5 | 5 | 100.0% |
| 3 | Drayton & Farlington | 12 | 11 | 91.7% |
| 4 | Cosham | 9 | 8 | 88.9% |
| 5 | Hilsea | 6 | 5 | 83.3% |
| 6 | Milton | 5 | 3 | 60.0% |
A rear extension has a 100.0% approval rate in Copnor but just 60.0% in Milton.
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 Portsmouth.
| Type | Decisions | Rate |
|---|---|---|
| Conservatory | 219 | 93.2% |
| Outbuilding | 230 | 92.2% |
| Wraparound Extension | 46 | 91.3% |
| Rear Extension | 2,254 | 89.2% |
| Basement | 87 | 87.4% |
| Side Extension | 571 | 87.0% |
| Extension (General) | 313 | 85.9% |
| HMO | 1,003 | 85.5% |
| Front Extension | 109 | 85.3% |
| Change of Use (Residential) | 1,336 | 84.7% |
| Garage / Parking | 657 | 84.6% |
| Hip-to-Gable Conversion | 101 | 79.2% |
| Dormer | 756 | 78.7% |
| Annex | 36 | 75.0% |
| Loft Conversion | 200 | 75.0% |
| New Build | 27 | 70.4% |
| Flat Conversion | 147 | 68.7% |
244 rear extension applications in Portsmouth 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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