Rear Extension approval rate in Hillingdon
Hillingdon approved 78.4% of rear extension applications, based on 10,275 decisions analysed.
Last updated: August 2026
78.4%
rear extension approval rate
10,275
Rear Extension decisions
8,059
Approved
2,216
Refused
80.0%
Hillingdon overall
Rear Extension applications are approved at roughly the same rate as the Hillingdon average (80.0%).
How rear extension compares in Hillingdon
Rear Extension
78.4%
Hillingdon all applications
80.0%
Planning a rear extension in Hillingdon?
78.4% 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
✓ PDF report for your architect
Free planning check for Hillingdon →
✓ Nearest comparable rear extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Hillingdon
81.9%
79.3%
71.8%
81.0%
84.0%
83.8%
81.3%
66.2%
76.8%
73.6%
82.5%
74.3%
85.7%
58.5%
42.3%