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

Rear Extension Approval Rates in Test Valley

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 703 real decisions tell us about rear extension outcomes in Test Valley.

703 real decisions·January 2020 to present·Updated March 2026
94.2%
Approval Rate
703
Decisions
662
Approved
41
Refused
94.2% approved. But 41 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
1MID TEST66
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 Test Valley.

TypeDecisionsRate
Wraparound Extension48
97.9%
Conservatory248
96.0%
Front Extension114
95.6%
Side Extension393
94.9%
Rear Extension703
94.2%
Loft Conversion58
93.1%
Dormer161
91.9%
Extension (General)329
91.8%
Outbuilding339
91.2%
Garage / Parking882
90.6%
Annex95
87.4%
Basement22
86.4%
Change of Use (Residential)225
82.2%
New Build241
79.7%
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What the data tells us

1
94.2% of rear extension applications in Test Valley get approved. That means 41 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

41 rear extension applications in Test Valley 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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Free instant check · Pro Report £79 · Based on 2,500,000+ real decisions

More Test Valley planning data

Nearby councils rear extension data

Methodology: Based on 703 planning decisions classified as rear extensions in Test Valley, 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 Test Valley Council's public planning portal. Full methodology →
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