Side Extension approval rate in Harrow
Harrow approved 73.6% of side extension applications, based on 4,224 decisions analysed.
Last updated: June 2026
73.6%
side extension approval rate
4,224
Side Extension decisions
3,110
Approved
1,114
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
73.6%
Harrow all applications
75.9%
Planning a side extension in Harrow?
73.6% 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
75.3%
74.6%
76.3%
77.4%
79.0%
77.1%
81.1%
56.4%
75.5%
63.1%
69.7%
70.1%
42.1%
86.4%
78.7%