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Rear Extension Approval Rates in Basildon

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 250 real decisions tell us about rear extension outcomes in Basildon.

250 real decisions·January 2020 to present·Updated June 2026
89.2%
Approval Rate
250
Decisions
223
Approved
27
Refused
89.2% approved. But 27 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 Basildon: Castledon And Crouch approves 100.0% of rear extension applications while Nethermayne 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
1Castledon And Crouch88
100.0%
2Billericay East1010
100.0%
3Burstead99
100.0%
4Langdon Hills55
100.0%
5Nethermayne54
80.0%
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These are council averages. Your property is specific.

A rear extension has a 100.0% approval rate in Castledon And Crouch but just 80.0% in Nethermayne.
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 Basildon.

TypeDecisionsRate
Conservatory29
96.6%
Hip-to-Gable Conversion21
95.2%
Front Extension65
92.3%
Rear Extension250
89.2%
Extension (General)80
88.8%
Side Extension121
88.4%
Garage / Parking237
85.7%
New Build57
84.2%
Dormer124
83.1%
Loft Conversion64
82.8%
Outbuilding79
81.0%
Change of Use (Residential)78
80.8%
See how this applies to your postcode →

What the data tells us

1
89.2% of rear extension applications in Basildon get approved. That means 27 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 Castledon And Crouch (100.0%) and Nethermayne (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

27 rear extension applications in Basildon 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 Basildon planning data

Nearby councils rear extension data

Methodology: Based on 250 planning decisions classified as rear extensions in Basildon, 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 Basildon Council's public planning portal. Full methodology →
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