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Rear Extension Approval Rates in Swindon

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 1,205 real decisions tell us about rear extension outcomes in Swindon.

1,205 real decisions·January 2020 to present·Updated June 2026
93.7%
Approval Rate
1,205
Decisions
1,129
Approved
76
Refused
93.7% approved. But 76 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.

Rear Extension approval rate by ward

#WardDecisionsApprovedRate
1Haydon Wick66
100.0%
2Penhill And Upper Stratton66
100.0%
3Blunsdon And Highworth55
100.0%
4St Margaret And South Marston55
100.0%
5Chiseldon And Lawn55
100.0%
6Wroughton And Wichelstowe55
100.0%
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These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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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 Swindon.

TypeDecisionsRate
Wraparound Extension65
96.9%
Conservatory233
96.1%
Outbuilding77
94.8%
Rear Extension1,205
93.7%
Extension (General)121
93.4%
Side Extension490
93.3%
Garage / Parking409
92.7%
Loft Conversion39
92.3%
New Build249
90.0%
Dormer178
89.9%
Change of Use (Residential)139
89.9%
Front Extension119
89.9%
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What the data tells us

1
93.7% of rear extension applications in Swindon get approved. That means 76 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

76 rear extension applications in Swindon 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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More Swindon planning data

Methodology: Based on 1,205 planning decisions classified as rear extensions in Swindon, 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 Swindon Council's public planning portal. Full methodology →
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