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Rear Extension Approval Rates in Carlisle

Rear extensions are the bread and butter of UK planning — and one of the most common reasons homeowners face a refusal. Here's what 517 real decisions tell us about rear extension outcomes in Carlisle.

517 real decisions·January 2020 to present·Updated March 2026
99.0%
Approval Rate
517
Decisions
512
Approved
5
Refused
99.0% approved. But 5 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.

Rear Extension approval rate by ward

#WardDecisionsApprovedRate
1Corby & Hayton66
100.0%
2Dalston & Burgh66
100.0%
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These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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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 Carlisle.

TypeDecisionsRate
Annex21
100.0%
Front Extension31
100.0%
Wraparound Extension26
100.0%
Conservatory166
99.4%
Side Extension230
99.1%
Rear Extension517
99.0%
Garage / Parking318
97.8%
New Build182
97.8%
Change of Use (Residential)119
96.6%
Extension (General)311
96.5%
Outbuilding180
94.4%
Dormer24
91.7%
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What the data tells us

1
99.0% of rear extension applications in Carlisle get approved. That means 5 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

5 rear extension applications in Carlisle 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 Carlisle planning data

Methodology: Based on 517 planning decisions classified as rear extensions in Carlisle, 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 Carlisle Council's public planning portal. Full methodology →
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