Side Extension approval rate in Westminster
Westminster approved 88.6% of side extension applications, based on 465 decisions analysed.
Last updated: March 2026
88.6%
side extension approval rate
465
Side Extension decisions
412
Approved
53
Refused
90.8%
Westminster overall
Side Extension applications are refused more often than the Westminster average (90.8%), suggesting the council scrutinises these projects more closely.
How side extension compares in Westminster
Side Extension
88.6%
Westminster all applications
90.8%
Planning a side extension in Westminster?
88.6% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.
✓ Your ward's side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Get Westminster Pro Report — £79
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Less than one set of revised drawings.
Other project types in Westminster
92.8%
91.0%
87.7%
88.6%
93.6%
92.8%
86.1%
96.6%
88.4%
90.4%
77.3%
94.3%
89.8%
82.1%