Side Extension approval rate in Blackburn with Darwen
Blackburn with Darwen approved 88.3% of side extension applications, based on 1,057 decisions analysed.
Last updated: April 2026
88.3%
side extension approval rate
1,057
Side Extension decisions
933
Approved
124
Refused
89.0%
Blackburn with Darwen overall
Side Extension applications are approved at roughly the same rate as the Blackburn with Darwen average (89.0%).
How side extension compares in Blackburn with Darwen
Side Extension
88.3%
Blackburn with Darwen all applications
89.0%
Planning a side extension in Blackburn with Darwen?
88.3% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.
✓ Your ward's side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Get Blackburn with Darwen Pro Report — £79
✓ Nearest comparable side 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
90.2%
87.8%
88.8%
81.9%
84.0%
92.6%
88.7%
85.6%
87.9%
71.6%
87.1%
89.8%
91.3%
83.9%
55.2%