Rear Extension approval rate in Blackburn with Darwen
Blackburn with Darwen approved 90.2% of rear extension applications, based on 2,166 decisions analysed.
Last updated: April 2026
90.2%
rear extension approval rate
2,166
Rear Extension decisions
1,953
Approved
213
Refused
89.0%
Blackburn with Darwen overall
Rear Extension applications are approved at roughly the same rate as the Blackburn with Darwen average (89.0%).
How rear extension compares in Blackburn with Darwen
Rear Extension
90.2%
Blackburn with Darwen all applications
89.0%
Planning a rear extension in Blackburn with Darwen?
90.2% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.
✓ Your ward's rear extension approval rate
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Get Blackburn with Darwen Pro Report — £79
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Less than one set of revised drawings.
Other project types in Blackburn with Darwen
87.8%
88.8%
88.3%
81.9%
84.0%
92.6%
88.7%
85.6%
87.9%
71.6%
87.1%
89.8%
91.3%
83.9%
55.2%