Side Extension approval rate in Westminster
Westminster approved 87.9% of side extension applications, based on 520 decisions analysed.
Last updated: September 2026
87.9%
side extension approval rate
520
Side Extension decisions
457
Approved
63
Refused
90.5%
Westminster overall
Side Extension applications are refused more often than the Westminster average (90.5%), suggesting the council scrutinises these projects more closely.
How side extension compares in Westminster
Side Extension
87.9%
Westminster all applications
90.5%
Planning a side extension in Westminster?
87.9% 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 side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Westminster →
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Planning professional? PlanningLens runs refusal alerts and evidence packs for Westminster and any other published UK council — see the data services →
Other project types in Westminster
92.8%
91.0%
87.6%
88.4%
93.5%
92.6%
86.0%
88.3%
90.0%
96.4%
73.6%
93.7%
87.3%
80.0%