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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 29.5% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

3,606 real decisions·14 project types·Updated March 2026
98.7%
Safest: Outbuilding
69.2%
Lowest: Annex
29.5%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Outbuilding75741
98.7%
2Conservatory1781753
98.3%
3Extension (General)95923
96.8%
4Front Extension44542520
95.5%
5Rear Extension1,1281,05771
93.7%
6Change of Use (Residential)26424618
93.2%
7Side Extension43639937
91.5%
8Wraparound Extension91838
91.2%
9Loft Conversion101929
91.1%
10Garage / Parking37434034
90.9%
11Dormer12611412
90.5%
12HMO28253
89.3%
13New Build16914623
86.4%
14Annex26188
69.2%
See how this applies to your postcode →

These are council averages. Your property is specific.

A outbuilding application has a 98.7% approval rate. Annex? Just 69.2%.
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What the data tells us

1
The range is massive: 69.2% to 98.7%. 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

225 planning applications in Stevenage 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 Stevenage planning data

Methodology: Classifies 3,606 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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