Data-backed planning intelligence · 3,290,000+ decisions analysed across England

Most Common Planning Applications in Sutton

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Sutton 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.

18,303 real decisions·17 project types·Updated June 2026
91.6%
Safest: Flat Conversion
73.4%
Lowest: Annex
18.2%
Spread
17
Types ranked

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All 17 project types ranked

#TypeDecisionsApprovedRefusedRate
1Flat Conversion91683977
91.6%
2Extension (General)2,2021,962240
89.1%
3Basement23419836
84.6%
4Conservatory41635165
84.4%
5Dormer3,1282,595533
83.0%
6Garage / Parking4,1173,411706
82.9%
7Hip-to-Gable Conversion43035575
82.6%
8Change of Use (Residential)966792174
82.0%
9Outbuilding846693153
81.9%
10Rear Extension7,1905,7511,439
80.0%
11Wraparound Extension1,079857222
79.4%
12Side Extension3,0382,406632
79.2%
13Loft Conversion14811731
79.1%
14New Build1,059827232
78.1%
15Front Extension939729210
77.6%
16HMO18514045
75.7%
17Annex15411341
73.4%
See how this applies to your postcode →

These are council averages. Your property is specific.

A flat conversion application has a 91.6% approval rate. Annex? Just 73.4%.
Check your postcode to see what actually happens near your address.

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What the data tells us

1
The range is massive: 73.4% to 91.6%. 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

2,892 planning applications in Sutton 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 Sutton planning data

Nearby councils project type rankings

Methodology: Classifies 18,303 decisions in Sutton 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 Sutton Council's public planning portal, January 2020 to present. Full methodology →
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