Side Extension approval rate in Harrow
Harrow approved 73.7% of side extension applications, based on 4,348 decisions analysed.
Last updated: September 2026
73.7%
side extension approval rate
4,348
Side Extension decisions
3,205
Approved
1,143
Refused
73.1%
Harrow overall
Side Extension applications are approved at roughly the same rate as the Harrow average (73.1%).
How side extension compares in Harrow
Side Extension
73.7%
Harrow all applications
73.1%
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
Planning professional? PlanningLens runs refusal alerts and evidence packs for Harrow and any other published UK council — see the data services →
Other project types in Harrow
75.4%
74.6%
76.4%
77.3%
78.7%
77.0%
80.9%
55.6%
76.0%
63.1%
69.0%
70.8%
44.3%
76.5%
86.4%