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Most Common Planning Applications in Monmouthshire

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Monmouthshire is 5.7% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

818 real decisions·11 project types·Updated September 2026
100.0%
Safest: Side Extension
94.3%
Lowest: Change of Use (Residential)
5.7%
Spread
11
Types ranked

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All 11 project types ranked

#TypeDecisionsApprovedRefusedRate
1Side Extension75750
100.0%
2Annex29290
100.0%
3Rear Extension1141131
99.1%
4Dormer60591
98.3%
5Conservatory54531
98.1%
6Extension (General)2582517
97.3%
7Loft Conversion26251
96.2%
8Garage / Parking29728512
96.0%
9New Build25241
96.0%
10Outbuilding1401328
94.3%
11Change of Use (Residential)105996
94.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A side extension application has a 100.0% approval rate. Change of Use (Residential)? Just 94.3%.
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: 94.3% to 100.0%. 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

42 planning applications in Monmouthshire 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 Monmouthshire planning data

Nearby councils project type rankings

Methodology: Classifies 818 decisions in Monmouthshire 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 Monmouthshire Council's public planning portal, January 2020 to September 2026. Full methodology →
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