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Most Common Planning Applications in Rhondda Cynon Taf

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Rhondda Cynon Taf is 53.8% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

5,234 real decisions·16 project types·Updated August 2026
100.0%
Safest: Wraparound Extension
46.2%
Lowest: HMO
53.8%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Wraparound Extension33330
100.0%
2Side Extension2622557
97.3%
3Front Extension30291
96.7%
4Rear Extension59456826
95.6%
5Extension (General)64161328
95.6%
6Dormer19318112
93.8%
7Loft Conversion1171098
93.2%
8Conservatory53494
92.5%
9Annex55505
90.9%
10Garage / Parking77169774
90.4%
11Outbuilding15914019
88.1%
12Flat Conversion41365
87.8%
13Change of Use (Residential)43936970
84.1%
14Basement39318
79.5%
15New Build705218
74.3%
16HMO522428
46.2%
See how this applies to your postcode →

These are council averages. Your property is specific.

A wraparound extension application has a 100.0% approval rate. HMO? Just 46.2%.
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What the data tells us

1
The range is massive: 46.2% 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

373 planning applications in Rhondda Cynon Taf 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 Rhondda Cynon Taf planning data

Methodology: Classifies 5,234 decisions in Rhondda Cynon Taf 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 Rhondda Cynon Taf Council's public planning portal, January 2020 to August 2026. Full methodology →
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