Annex approval rate in Harrow
Harrow approved 44.3% of annex applications, based on 79 decisions analysed.
Last updated: September 2026
44.3%
annex approval rate
79
Annex decisions
35
Approved
44
Refused
73.1%
Harrow overall
Annex applications are refused more often than the Harrow average (73.1%), suggesting the council scrutinises these projects more closely.
How annex compares in Harrow
Annex
44.3%
Harrow all applications
73.1%
Planning a annex in Harrow?
44.3% 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 annex approval rate
✓ Nearest comparable annex decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Harrow →
✓ Nearest comparable annex 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%
78.7%
77.0%
80.9%
55.6%
76.0%
63.1%
69.0%
70.8%
76.5%
86.4%