Rear Extension approval rate in Hillingdon
Hillingdon approved 77.8% of rear extension applications, based on 10,118 decisions analysed.
Last updated: June 2026
77.8%
rear extension approval rate
10,118
Rear Extension decisions
7,872
Approved
2,246
Refused
79.0%
Hillingdon overall
Rear Extension applications are approved at roughly the same rate as the Hillingdon average (79.0%).
How rear extension compares in Hillingdon
Rear Extension
77.8%
Hillingdon all applications
79.0%
Planning a rear extension in Hillingdon?
77.8% 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 Hillingdon
81.0%
78.5%
71.2%
80.2%
83.5%
83.0%
80.4%
65.6%
76.1%
73.1%
81.9%
74.3%
84.2%
57.5%
41.4%