Loft conversions change your roofline — and that makes them one of the more closely scrutinised application types. Councils scrutinise visibility, overlooking and street character more closely than for ground-level work. Here's what the data shows in Hillingdon.
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Loft conversions face more scrutiny than rear or side extensions because they change the property's profile from the street. Dormers, mansards and hip-to-gable alterations are particularly sensitive.
Two houses on the same street can get different outcomes.
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Not all applications are treated equally. Here's how loft conversions stack up against other common projects in Hillingdon.
| Type | Decisions | Rate |
|---|---|---|
| Basement | 477 | 85.7% |
| Hip-to-Gable Conversion | 2,310 | 84.0% |
| Extension (General) | 2,013 | 83.8% |
| Conservatory | 878 | 82.5% |
| Garage / Parking | 7,631 | 81.9% |
| New Build | 1,672 | 81.3% |
| Outbuilding | 2,670 | 81.0% |
| Dormer | 4,969 | 79.3% |
| Rear Extension | 10,275 | 78.4% |
| Wraparound Extension | 1,020 | 76.8% |
| Change of Use (Residential) | 1,484 | 74.9% |
| Loft Conversion | 498 | 74.3% |
| Flat Conversion | 917 | 73.6% |
| Side Extension | 4,872 | 71.8% |
| Front Extension | 1,075 | 66.2% |
| HMO | 347 | 58.5% |
| Annex | 130 | 42.3% |
128 loft conversion applications in Hillingdon 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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