Side Extension approval rate in Chelmsford

Chelmsford approved 83.5% of side extension applications, based on 79 decisions analysed.

Last updated: March 2026

83.5%

side extension approval rate

Side Extension decisions

Approved

Refused

85.7%

Chelmsford overall

Side Extension applications are refused more often than the Chelmsford average (85.7%), suggesting the council scrutinises these projects more closely.

How side extension compares in Chelmsford

Side Extension (79 decided)

83.5%

Chelmsford all applications (505 decided)

85.7%

Planning a side extension in Chelmsford?

83.5% 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 Chelmsford Pro Report — £79

Less than one set of revised drawings.