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Most Common Planning Applications in Kensington & Chelsea

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Kensington & Chelsea is 8.7% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

33,175 real decisions·16 project types·Updated March 2026
94.7%
Safest: Annex
86.0%
Lowest: Wraparound Extension
8.7%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Annex1141086
94.7%
2Change of Use (Residential)2,0161,898118
94.1%
3Garage / Parking1,8521,719133
92.8%
4Flat Conversion48444836
92.6%
5New Build55251042
92.4%
6Basement7,1116,561550
92.3%
7Extension (General)2,9542,725229
92.2%
8HMO16414915
90.9%
9Outbuilding79071773
90.8%
10Rear Extension3,1922,864328
89.7%
11Side Extension66859969
89.7%
12Dormer1,1901,061129
89.2%
13Conservatory89879999
89.0%
14Front Extension43385
88.4%
15Loft Conversion1,8271,579248
86.4%
16Wraparound Extension50437
86.0%
See how this applies to your postcode →

These are council averages. Your property is specific.

A annex application has a 94.7% approval rate. Wraparound Extension? Just 86.0%.
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What the data tells us

1
The range is massive: 86.0% to 94.7%. 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

2,504 planning applications in Kensington & Chelsea 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 Kensington & Chelsea planning data

Nearby councils project type rankings

Methodology: Classifies 33,175 decisions in Kensington & Chelsea 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 Kensington & Chelsea Council's public planning portal, January 2020 to present. Full methodology →
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