Side Extension approval rate in Spelthorne
Spelthorne approved 83.7% of side extension applications, based on 245 decisions analysed.
Last updated: September 2026
83.7%
side extension approval rate
245
Side Extension decisions
205
Approved
40
Refused
82.5%
Spelthorne overall
Side Extension applications are approved at roughly the same rate as the Spelthorne average (82.5%).
How side extension compares in Spelthorne
Side Extension
83.7%
Spelthorne all applications
82.5%
Planning a side extension in Spelthorne?
83.7% 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 side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Free planning check for Spelthorne →
✓ 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 Spelthorne and any other published UK council — see the data services →
Other project types in Spelthorne
85.9%
79.8%
75.7%
73.8%
88.7%
90.4%
74.5%
86.7%
87.8%
80.0%
77.8%
42.6%
31.2%
75.0%