Outbuilding approval rate in Harrow
Harrow approved 78.7% of outbuilding applications, based on 1,810 decisions analysed.
Last updated: September 2026
78.7%
outbuilding approval rate
1,810
Outbuilding decisions
1,425
Approved
385
Refused
73.1%
Harrow overall
Outbuilding applications are approved more often than the Harrow average (73.1%), suggesting the council is relatively receptive to these projects.
How outbuilding compares in Harrow
Outbuilding
78.7%
Harrow all applications
73.1%
Planning a outbuilding in Harrow?
78.7% 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 outbuilding approval rate
✓ Nearest comparable outbuilding decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Harrow →
✓ Nearest comparable outbuilding decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Planning professional? PlanningLens runs refusal alerts and evidence packs for Harrow and any other published UK council — see the data services →
Other project types in Harrow
75.4%
74.6%
73.7%
76.4%
77.3%
77.0%
80.9%
55.6%
76.0%
63.1%
69.0%
70.8%
44.3%
76.5%
86.4%