Rear Extension approval rate in Harrow
Harrow approved 75.3% of rear extension applications, based on 10,512 decisions analysed.
Last updated: June 2026
75.3%
rear extension approval rate
10,512
Rear Extension decisions
7,911
Approved
2,601
Refused
75.9%
Harrow overall
Rear Extension applications are approved at roughly the same rate as the Harrow average (75.9%).
How rear extension compares in Harrow
Rear Extension
75.3%
Harrow all applications
75.9%
Planning a rear extension in Harrow?
75.3% 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 rear extension approval rate
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
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✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Harrow
74.6%
73.6%
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%