Rear Extension approval rate in Hillingdon
Hillingdon approved 78.6% of rear extension applications, based on 10,373 decisions analysed.
Last updated: September 2026
78.6%
rear extension approval rate
10,373
Rear Extension decisions
8,150
Approved
2,223
Refused
77.9%
Hillingdon overall
Rear Extension applications are approved at roughly the same rate as the Hillingdon average (77.9%).
How rear extension compares in Hillingdon
Rear Extension
78.6%
Hillingdon all applications
77.9%
Planning a rear extension in Hillingdon?
78.6% 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
Planning professional? PlanningLens runs refusal alerts and evidence packs for Hillingdon and any other published UK council — see the data services →
Other project types in Hillingdon
81.9%
79.4%
71.9%
81.1%
84.2%
83.8%
81.4%
66.4%
76.9%
73.7%
82.6%
74.3%
85.6%
57.7%
42.0%