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Most Common Planning Applications in Stevenage

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Stevenage is 25.5% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

3,863 real decisions·14 project types·Updated June 2026
98.8%
Safest: Outbuilding
73.3%
Lowest: Annex
25.5%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Outbuilding85841
98.8%
2Conservatory1811783
98.3%
3Extension (General)102984
96.1%
4Front Extension46544520
95.7%
5Rear Extension1,2061,13274
93.9%
6Change of Use (Residential)28626719
93.4%
7Side Extension47443638
92.0%
8Wraparound Extension100928
92.0%
9Garage / Parking41738136
91.4%
10HMO32293
90.6%
11Loft Conversion1069610
90.6%
12Dormer13111813
90.1%
13New Build18916623
87.8%
14Annex30228
73.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A outbuilding application has a 98.8% approval rate. Annex? Just 73.3%.
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What the data tells us

1
The range is massive: 73.3% to 98.8%. 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

235 planning applications in Stevenage 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 Stevenage planning data

Methodology: Classifies 3,863 decisions in Stevenage 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 Stevenage Council's public planning portal, January 2020 to present. Full methodology →
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