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

Most Common Planning Applications in Test Valley

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Test Valley is 18.2% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

5,558 real decisions·14 project types·Updated March 2026
97.9%
Safest: Wraparound Extension
79.7%
Lowest: New Build
18.2%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Wraparound Extension48471
97.9%
2Conservatory24823810
96.0%
3Front Extension1141095
95.6%
4Side Extension39337320
94.9%
5Rear Extension70366241
94.2%
6Loft Conversion58544
93.1%
7Dormer16114813
91.9%
8Extension (General)32930227
91.8%
9Outbuilding33930930
91.2%
10Garage / Parking88279983
90.6%
11Annex958312
87.4%
12Basement22193
86.4%
13Change of Use (Residential)22518540
82.2%
14New Build24119249
79.7%
See how this applies to your postcode →

These are council averages. Your property is specific.

A wraparound extension application has a 97.9% approval rate. New Build? Just 79.7%.
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What the data tells us

1
The range is massive: 79.7% to 97.9%. Choosing the right project type — or framing your application correctly — can dramatically affect outcomes.
2
Visibility drives scrutiny. Project types that change the external appearance — dormers, loft conversions, hip-to-gable — face more resistance than those that don't. The more visible your proposal, the more carefully it needs designing.
3
These are council-wide averages. Your ward, your street and your immediate neighbours all shift the odds. The comparable decisions near your property are the best indicator of outcome.

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

488 planning 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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More Test Valley planning data

Nearby councils project type rankings

Methodology: Classifies 5,558 decisions in Test Valley into residential project types using keyword matching against proposal descriptions (matching generate_site_data.py subtype rules). A single application may appear in multiple categories. Data from Test Valley Council's public planning portal, January 2020 to present. Full methodology →
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