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Most Common Planning Applications in Merthyr Tydfil

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Merthyr Tydfil is 19.2% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

819 real decisions·8 project types·Updated September 2026
98.1%
Safest: Rear Extension
78.9%
Lowest: Dormer
19.2%
Spread
8
Types ranked

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All 8 project types ranked

#TypeDecisionsApprovedRefusedRate
1Rear Extension1581553
98.1%
2Garage / Parking18216814
92.3%
3New Build50455
90.0%
4Extension (General)928210
89.1%
5Side Extension61547
88.5%
6Outbuilding44386
86.4%
7Change of Use (Residential)13911227
80.6%
8Dormer38308
78.9%
See how this applies to your postcode →

These are council averages. Your property is specific.

A rear extension application has a 98.1% approval rate. Dormer? Just 78.9%.
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What the data tells us

1
The range is massive: 78.9% to 98.1%. 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

93 planning applications in Merthyr Tydfil 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 Merthyr Tydfil planning data

Methodology: Classifies 819 decisions in Merthyr Tydfil 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 Merthyr Tydfil Council's public planning portal, January 2020 to September 2026. Full methodology →
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