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Rear Extension Approval Rates in South Gloucestershire

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 3,835 real decisions tell us about rear extension outcomes in South Gloucestershire.

3,835 real decisions·January 2020 to present·Updated June 2026
90.8%
Approval Rate
3,835
Decisions
3,483
Approved
352
Refused
90.8% approved. But 352 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 rear extension approval rates matter

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 gap in South Gloucestershire: Parkwall And Warmley approves 100.0% of rear extension applications while Frampton Cotterell sits at 83.3%. That 16.7% gap means your postcode is one of the strongest indicators of outcome.

Rear Extension approval rate by ward

#WardDecisionsApprovedRate
1Parkwall And Warmley55
100.0%
2Emersons Green55
100.0%
3Frampton Cotterell65
83.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A rear extension has a 100.0% approval rate in Parkwall And Warmley but just 83.3% in Frampton Cotterell.
Check your postcode to see what actually happens near your address.

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How rear extensions compare to other project types

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

TypeDecisionsRate
Conservatory458
91.9%
Rear Extension3,835
90.8%
Wraparound Extension416
90.4%
Basement39
89.7%
Side Extension2,449
87.0%
Outbuilding855
84.7%
Front Extension636
84.4%
Garage / Parking2,599
83.4%
Hip-to-Gable Conversion229
83.4%
Dormer1,051
82.2%
Extension (General)574
81.9%
Change of Use (Residential)1,021
80.2%
Loft Conversion703
79.7%
Annex387
79.1%
Flat Conversion42
78.6%
HMO300
78.0%
New Build2,676
76.5%
See how this applies to your postcode →

What the data tells us

1
90.8% of rear extension applications in South Gloucestershire get approved. That means 352 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
2
Your ward matters more than you think. The 16.7% gap between Parkwall And Warmley (100.0%) and Frampton Cotterell (83.3%) means your postcode is one of the strongest indicators of outcome.
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

352 rear extension applications in South Gloucestershire 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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Free · Property report emailed in minutes · Based on 3,290,000+ real decisions

More South Gloucestershire planning data

Nearby councils rear extension data

Methodology: Based on 3,835 planning decisions classified as rear extensions 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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