Side Extension approval rate in Chelmsford
Chelmsford approved 83.5% of side extension applications, based on 79 decisions analysed.
Last updated: September 2026
83.5%
side extension approval rate
79
Side Extension decisions
66
Approved
13
Refused
83.1%
Chelmsford overall
Side Extension applications are approved at roughly the same rate as the Chelmsford average (83.1%).
How side extension compares in Chelmsford
Side Extension
83.5%
Chelmsford all applications
83.1%
Planning a side extension in Chelmsford?
83.5% 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 Chelmsford →
✓ 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 Chelmsford and any other published UK council — see the data services →
Other project types in Chelmsford
86.4%
85.4%
89.2%
89.2%
96.6%
96.0%
87.0%
90.0%
94.7%
100.0%