Side Extension approval rate in Harrow
Harrow approved 73.7% of side extension applications, based on 4,286 decisions analysed.
Last updated: August 2026
73.7%
side extension approval rate
4,286
Side Extension decisions
3,157
Approved
1,129
Refused
75.9%
Harrow overall
Side Extension applications are refused more often than the Harrow average (75.9%), suggesting the council scrutinises these projects more closely.
How side extension compares in Harrow
Side Extension
73.7%
Harrow all applications
75.9%
Planning a side extension in Harrow?
73.7% 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 side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Harrow →
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Harrow
75.4%
74.6%
76.4%
77.3%
78.8%
76.7%
80.8%
55.6%
75.9%
63.3%
69.8%
70.6%
43.6%
86.4%
77.8%