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Most Common Planning Applications in North Northamptonshire

Not all planning applications are created equal. The gap between the highest and lowest approval project type in North Northamptonshire is 13.4% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

1,904 real decisions·14 project types·Updated September 2026
96.7%
Safest: Conservatory
83.3%
Lowest: Annex
13.4%
Spread
14
Types ranked

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All 14 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory1511465
96.7%
2Front Extension1131076
94.7%
3Extension (General)34532520
94.2%
4Rear Extension72267250
93.1%
5Outbuilding21019218
91.4%
6HMO23212
91.3%
7Side Extension41237438
90.8%
8Garage / Parking69562966
90.5%
9Wraparound Extension57516
89.5%
10Loft Conversion58517
87.9%
11New Build1018714
86.1%
12Dormer1119516
85.6%
13Change of Use (Residential)19216329
84.9%
14Annex48408
83.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 96.7% approval rate. Annex? Just 83.3%.
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What the data tells us

1
The range is massive: 83.3% to 96.7%. 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

213 planning applications in North Northamptonshire 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 North Northamptonshire planning data

Methodology: Classifies 1,904 decisions in North Northamptonshire 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 North Northamptonshire Council's public planning portal, January 2020 to September 2026. Full methodology →
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