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Rear Extension Approval Rates in Chichester

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 400 real decisions tell us about rear extension outcomes in Chichester.

400 real decisions·January 2020 to present·Updated May 2026
95.0%
Approval Rate
400
Decisions
380
Approved
20
Refused
95.0% approved. But 20 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 Chichester: Selsey South approves 100.0% of rear extension applications while Harbour Villages 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
1Selsey South66
100.0%
2The Witterings1111
100.0%
3Harbour Villages54
80.0%
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These are council averages. Your property is specific.

A rear extension has a 100.0% approval rate in Selsey South but just 80.0% in Harbour Villages.
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 Chichester.

TypeDecisionsRate
Front Extension62
98.4%
Conservatory102
97.1%
Rear Extension400
95.0%
Side Extension229
94.8%
Wraparound Extension36
94.4%
Outbuilding189
91.0%
Extension (General)187
90.4%
Garage / Parking470
88.3%
Dormer152
86.8%
Loft Conversion51
86.3%
Annex53
83.0%
New Build108
78.7%
Change of Use (Residential)137
75.9%
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What the data tells us

1
95.0% of rear extension applications in Chichester get approved. That means 20 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 Selsey South (100.0%) and Harbour Villages (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

20 rear extension applications in Chichester 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 Chichester planning data

Methodology: Based on 400 planning decisions classified as rear extensions in Chichester, 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 Chichester Council's public planning portal. Full methodology →
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