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Most Common Planning Applications in Cambridge

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Cambridge is 18.4% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

4,752 real decisions·16 project types·Updated September 2026
100.0%
Safest: Hip-to-Gable Conversion
81.6%
Lowest: Change of Use (Residential)
18.4%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Hip-to-Gable Conversion83830
100.0%
2Conservatory3453405
98.6%
3Basement1081062
98.1%
4Wraparound Extension38337211
97.1%
5Outbuilding79977425
96.9%
6Dormer58957118
96.9%
7Rear Extension2,0992,02574
96.5%
8Side Extension1,2481,20246
96.3%
9Front Extension49047020
95.9%
10Garage / Parking1,5951,51580
95.0%
11Loft Conversion54551431
94.3%
12Extension (General)47144229
93.8%
13Annex22621214
93.8%
14New Build45140348
89.4%
15HMO816912
85.2%
16Change of Use (Residential)47939188
81.6%
See how this applies to your postcode →

These are council averages. Your property is specific.

A hip-to-gable conversion application has a 100.0% approval rate. Change of Use (Residential)? Just 81.6%.
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What the data tells us

1
The range is massive: 81.6% 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

362 planning applications in Cambridge 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 Cambridge planning data

Nearby councils project type rankings

Methodology: Classifies 4,752 decisions in Cambridge 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 Cambridge Council's public planning portal, January 2020 to September 2026. Full methodology →
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