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Loft Conversion Approval Rates in Kensington & Chelsea

Loft conversions change your roofline — and that makes them one of the more closely scrutinised application types. Councils scrutinise visibility, overlooking and street character more closely than for ground-level work. Here's what the data shows in Kensington & Chelsea.

1,827 real decisions·January 2020 to present·Updated March 2026
86.4%
Approval Rate
1,827
Decisions
1,579
Approved
248
Refused
86.4% approved. But 248 refused since 2020. Each refusal cost the homeowner time and money on drawings and application fees. Understanding your local data before you apply is the difference between confidence and a costly gamble.

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Why loft conversion approval rates matter

Loft conversions face more scrutiny than rear or side extensions because they change the property's profile from the street. Dormers, mansards and hip-to-gable alterations are particularly sensitive.

These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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How loft conversions compare to other project types

Not all applications are treated equally. Here's how loft conversions stack up against other common projects in Kensington & Chelsea.

TypeDecisionsRate
Annex114
94.7%
Change of Use (Residential)2,016
94.1%
Garage / Parking1,852
92.8%
Flat Conversion484
92.6%
New Build552
92.4%
Basement7,111
92.3%
Extension (General)2,954
92.2%
HMO164
90.9%
Outbuilding790
90.8%
Rear Extension3,192
89.7%
Side Extension668
89.7%
Dormer1,190
89.2%
Conservatory898
89.0%
Front Extension43
88.4%
Loft Conversion1,827
86.4%
Wraparound Extension50
86.0%
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What the data tells us

1
86.4% of loft conversion applications in Kensington & Chelsea get approved. That means 248 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
3
Council averages are starting points, not guarantees. The decisions that matter most are the comparable ones near your specific property — because planning officers look at precedent, character and the immediate context of your street.

Before you spend £5,000+ on architects and drawings

248 loft conversion 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 loft conversion data

Methodology: Based on 1,827 planning decisions classified as loft conversions in Kensington & Chelsea, January 2020 to present. Classification uses keyword matching against proposal descriptions (matching generate_site_data.py rules). A single application may appear in multiple categories. Approval rate = approved / (approved + refused). Pending, withdrawn and invalid applications excluded. Data from Kensington & Chelsea Council's public planning portal. Full methodology →
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