Rear Extension approval rate in Harrow
Harrow approved 78.2% of rear extension applications, based on 4,812 decisions analysed.
Last updated: March 2026
78.2%
rear extension approval rate
4,812
Rear Extension decisions
3,762
Approved
1,050
Refused
80.6%
Harrow overall
Rear Extension applications are refused more often than the Harrow average (80.6%), suggesting the council scrutinises these projects more closely.
How rear extension compares in Harrow
Rear Extension
78.2%
Harrow all applications
80.6%
Planning a rear extension in Harrow?
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✓ Your ward's rear extension approval rate
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✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Less than one set of revised drawings.
Other project types in Harrow
81.8%
77.3%
74.7%
77.1%
79.1%
92.2%
81.4%
81.4%
85.0%
82.5%
76.8%
79.1%
80.7%
42.6%
75.0%