Side Extension approval rate in Brentwood
Brentwood approved 82.2% of side extension applications, based on 2,171 decisions analysed.
Last updated: March 2026
82.2%
side extension approval rate
2,171
Side Extension decisions
1,785
Approved
386
Refused
83.8%
Brentwood overall
Side Extension applications are approved at roughly the same rate as the Brentwood average (83.8%).
How side extension compares in Brentwood
Side Extension
82.2%
Brentwood all applications
83.8%
Planning a side extension in Brentwood?
82.2% 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 Brentwood 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 Brentwood
84.1%
83.3%
73.8%
83.4%
86.3%
80.7%
71.7%
83.9%
79.6%
76.4%
78.8%
81.9%
81.4%
65.8%
62.5%