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Most Common Planning Applications in Caerphilly

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Caerphilly is 32.7% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

1,944 real decisions·13 project types·Updated March 2026
90.3%
Safest: Conservatory
57.6%
Lowest: Front Extension
32.7%
Spread
13
Types ranked

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All 13 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory62566
90.3%
2New Build23203
87.0%
3Rear Extension43937663
85.6%
4Outbuilding675710
85.1%
5Loft Conversion49418
83.7%
6Garage / Parking40333469
82.9%
7Change of Use (Residential)1119021
81.1%
8Extension (General)22518243
80.9%
9Dormer1038122
78.6%
10Side Extension25720057
77.8%
11Annex26206
76.9%
12Wraparound Extension382810
73.7%
13Front Extension331914
57.6%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 90.3% approval rate. Front Extension? Just 57.6%.
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What the data tells us

1
The range is massive: 57.6% to 90.3%. 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

326 planning applications in Caerphilly have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A £79 report shows you what gets approved — and what gets refused — near your property.

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More Caerphilly planning data

Nearby councils project type rankings

Methodology: Classifies 1,944 decisions in Caerphilly 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 Caerphilly Council's public planning portal, January 2020 to present. Full methodology →
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