Annex approval rate in Cornwall

Cornwall approved 95.3% of annex applications, based on 814 decisions analysed.

Last updated: August 2026

95.3%

annex approval rate

814

Annex decisions

776

Approved

Refused

93.0%

Cornwall overall

Annex applications are approved more often than the Cornwall average (93.0%), suggesting the council is relatively receptive to these projects.

How annex compares in Cornwall

Annex (814 decided)

95.3%

Cornwall all applications (24,970 decided)

93.0%

Planning a annex in Cornwall?

95.3% get approved, but the odds vary by street. Your Full Planning Analysis shows exactly what gets approved and refused near your property.

✓ Your ward's annex approval rate
✓ Nearest comparable annex decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect

Free planning check for Cornwall →

Other project types in Cornwall

Extension (General) (4,090 decided)

95.9%

Garage / Parking (3,783 decided)

93.9%

Change of Use (Residential) (1,700 decided)

92.4%

Outbuilding (1,443 decided)

94.5%

Rear Extension (1,191 decided)

97.1%

New Build (969 decided)

82.9%

Dormer (656 decided)

96.3%

Side Extension (643 decided)

98.0%

Conservatory (594 decided)

97.5%

Loft Conversion (441 decided)

93.0%

Front Extension (126 decided)

93.7%

Basement (120 decided)

97.5%

Wraparound Extension (69 decided)

98.6%

HMO (62 decided)

93.5%

Flat Conversion (62 decided)

93.5%

Hip-to-Gable Conversion (16 decided)

81.2%

← All Cornwall planning statistics

Check planning approval patterns, Free