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Loft Conversion Approval Rates in South Gloucestershire

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 South Gloucestershire.

691 real decisions·January 2020 to present·Updated March 2026
79.5%
Approval Rate
691
Decisions
549
Approved
142
Refused
79.5% approved. But 142 refused since 2020. Each refusal cost the homeowner time and money on drawings and application fees. Understanding your local data before you apply is the difference between confidence and a costly gamble.

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Why loft conversion approval rates matter

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.

These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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How loft conversions compare to other project types

Not all applications are treated equally. Here's how loft conversions stack up against other common projects in South Gloucestershire.

TypeDecisionsRate
Conservatory452
91.8%
Rear Extension3,783
90.8%
Wraparound Extension412
90.3%
Basement39
89.7%
Side Extension2,420
86.9%
Front Extension632
84.5%
Outbuilding839
84.5%
Garage / Parking2,564
83.2%
Hip-to-Gable Conversion224
83.0%
Dormer1,033
82.1%
Extension (General)572
81.8%
Change of Use (Residential)1,011
80.2%
Loft Conversion691
79.5%
Annex380
78.9%
Flat Conversion42
78.6%
HMO294
77.9%
New Build2,652
76.5%
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What the data tells us

1
79.5% of loft conversion applications in South Gloucestershire get approved. That means 142 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
3
Council averages are starting points, not guarantees. The decisions that matter most are the comparable ones near your specific property — because planning officers look at precedent, character and the immediate context of your street.

Before you spend £5,000+ on architects and drawings

142 loft conversion applications in South Gloucestershire 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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More South Gloucestershire planning data

Nearby councils loft conversion data

Methodology: Based on 691 planning decisions classified as loft conversions in South Gloucestershire, January 2020 to present. Classification uses keyword matching against proposal descriptions (matching generate_site_data.py rules). A single application may appear in multiple categories. Approval rate = approved / (approved + refused). Pending, withdrawn and invalid applications excluded. Data from South Gloucestershire Council's public planning portal. Full methodology →
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