Data-backed planning intelligence · 2,500,000+ decisions analysed across England

Rear Extension Approval Rates in Oxford

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 1,277 real decisions tell us about rear extension outcomes in Oxford.

1,277 real decisions·January 2020 to present·Updated March 2026
89.2%
Approval Rate
1,277
Decisions
1,139
Approved
138
Refused
89.2% approved. But 138 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 Oxford: Wolvercote Ward approves 100.0% of rear extension applications while Cowley Ward sits at 66.7%. That 33.3% gap means your postcode is one of the strongest indicators of outcome.

Rear Extension approval rate by ward

#WardDecisionsApprovedRate
1Wolvercote Ward55
100.0%
2Marston Ward55
100.0%
3Donnington Ward77
100.0%
4Quarry And Risinghurst Ward55
100.0%
5Lye Valley Ward65
83.3%
6Cowley Ward64
66.7%
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These are council averages. Your property is specific.

A rear extension has a 100.0% approval rate in Wolvercote Ward but just 66.7% in Cowley Ward.
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 Oxford.

TypeDecisionsRate
Basement79
98.7%
Front Extension82
91.5%
Dormer449
91.3%
Conservatory157
91.1%
Loft Conversion341
90.6%
Extension (General)116
89.7%
Rear Extension1,277
89.2%
Hip-to-Gable Conversion121
88.4%
Outbuilding275
87.3%
Garage / Parking656
84.9%
Side Extension417
84.7%
Wraparound Extension134
84.3%
Change of Use (Residential)315
82.9%
New Build231
82.7%
Flat Conversion53
81.1%
HMO261
77.4%
Annex35
62.9%
See how this applies to your postcode →

What the data tells us

1
89.2% of rear extension applications in Oxford get approved. That means 138 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
2
Your ward matters more than you think. The 33.3% gap between Wolvercote Ward (100.0%) and Cowley Ward (66.7%) 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

138 rear extension applications in Oxford 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 Oxford planning data

Nearby councils rear extension data

Methodology: Based on 1,277 planning decisions classified as rear extensions in Oxford, 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 Oxford Council's public planning portal. Full methodology →
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