Data-backed planning intelligence · 3,230,000+ decisions analysed across England

Most Common Planning Applications in Gwynedd

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Gwynedd is 31.5% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

11,001 real decisions·16 project types·Updated June 2026
96.4%
Safest: Conservatory
64.9%
Lowest: HMO
31.5%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory1941877
96.4%
2Rear Extension64660640
93.8%
3Side Extension44140932
92.7%
4Basement26242
92.3%
5Extension (General)1,8291,672157
91.4%
6Loft Conversion11510510
91.3%
7Wraparound Extension45405
88.9%
8Front Extension958411
88.4%
9Outbuilding70460995
86.5%
10Garage / Parking994854140
85.9%
11Change of Use (Residential)657555102
84.5%
12Dormer28824345
84.4%
13New Build521413108
79.3%
14Annex16513035
78.8%
15Flat Conversion332310
69.7%
16HMO372413
64.9%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 96.4% approval rate. HMO? Just 64.9%.
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: 64.9% to 96.4%. 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

1,250 planning applications in Gwynedd 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 Gwynedd planning data

Methodology: Classifies 11,001 decisions in Gwynedd 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 Gwynedd Council's public planning portal, January 2020 to present. Full methodology →
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