Data-backed planning intelligence · 2,500,000+ decisions analysed across England

Rear Extension Approval Rates in Thanet

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 5,791 real decisions tell us about rear extension outcomes in Thanet.

5,791 real decisions·January 2020 to present·Updated March 2026
91.8%
Approval Rate
5,791
Decisions
5,315
Approved
476
Refused
91.8% approved. But 476 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 rear extension approval rates matter

Rear extensions sit in the middle of the pack nationally. They're common enough that councils have clear precedent — but that cuts both ways. If your neighbours have been refused, that precedent works against you too.

Ward gap in Thanet: Viking approves 100.0% of rear extension applications while St Peters sits at 80.0%. That 20.0% gap means your postcode is one of the strongest indicators of outcome.

Rear Extension approval rate by ward

#WardDecisionsApprovedRate
1Viking55
100.0%
2Westgate-on-Sea55
100.0%
3Birchington North99
100.0%
4Birchington South66
100.0%
5St Peters54
80.0%
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These are council averages. Your property is specific.

A rear extension has a 100.0% approval rate in Viking but just 80.0% in St Peters.
Check your postcode to see what actually happens near your address.

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How rear extensions compare to other project types

Not all applications are treated equally. Here's how rear extensions stack up against other common projects in Thanet.

TypeDecisionsRate
Conservatory1,136
93.0%
Wraparound Extension725
92.0%
Rear Extension5,791
91.8%
Front Extension712
90.7%
Side Extension2,924
89.1%
Outbuilding762
88.7%
Hip-to-Gable Conversion139
87.8%
Dormer1,897
87.2%
Annex254
87.0%
Loft Conversion817
86.0%
Extension (General)1,438
86.0%
Basement662
85.6%
Garage / Parking4,470
85.4%
Change of Use (Residential)3,648
85.0%
Flat Conversion1,086
81.2%
New Build4,000
81.0%
HMO150
80.7%
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What the data tells us

1
91.8% of rear extension applications in Thanet get approved. That means 476 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
2
Your ward matters more than you think. The 20.0% gap between Viking (100.0%) and St Peters (80.0%) means your postcode is one of the strongest indicators of outcome.
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

476 rear extension applications in Thanet 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 Thanet planning data

Methodology: Based on 5,791 planning decisions classified as rear extensions in Thanet, 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 Thanet Council's public planning portal. Full methodology →
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