Rear Extension approval rate in Hillingdon
Hillingdon approved 77.6% of rear extension applications, based on 9,930 decisions analysed.
Last updated: March 2026
77.6%
rear extension approval rate
9,930
Rear Extension decisions
7,701
Approved
2,229
Refused
78.9%
Hillingdon overall
Rear Extension applications are approved at roughly the same rate as the Hillingdon average (78.9%).
How rear extension compares in Hillingdon
Rear Extension
77.6%
Hillingdon all applications
78.9%
Planning a rear extension in Hillingdon?
77.6% get approved — but the odds vary by street. Your Pro Report 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
Get Hillingdon Pro Report — £79
✓ 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 Hillingdon
80.9%
78.4%
70.9%
80.0%
83.6%
83.0%
80.0%
65.5%
75.8%
73.0%
81.9%
84.1%
73.7%
59.6%
40.8%