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Most Common Planning Applications in Lisburn and Castlereagh City Council

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Lisburn and Castlereagh City Council is 11.1% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

7,589 real decisions·14 project types·Updated June 2026
100.0%
Safest: Wraparound Extension
88.9%
Lowest: Basement
11.1%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Wraparound Extension40400
100.0%
2Side Extension3573570
100.0%
3Front Extension53530
100.0%
4Loft Conversion67670
100.0%
5Rear Extension6246213
99.5%
6Dormer2022011
99.5%
7Extension (General)1,6351,61718
98.9%
8Conservatory73721
98.6%
9Annex55532
96.4%
10Change of Use (Residential)29927821
93.0%
11Garage / Parking2,3832,208175
92.7%
12Outbuilding33530035
89.6%
13New Build53948059
89.1%
14Basement27243
88.9%
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. Basement? Just 88.9%.
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What the data tells us

1
The range is massive: 88.9% 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

485 planning applications in Lisburn and Castlereagh City Council 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 Lisburn and Castlereagh City Council planning data

Methodology: Classifies 7,589 decisions in Lisburn and Castlereagh City Council 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 Lisburn and Castlereagh City Council Council's public planning portal, January 2020 to present. Full methodology →
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