Side Extension approval rate in Brentwood
Brentwood approved 82.4% of side extension applications, based on 2,220 decisions analysed.
Last updated: August 2026
82.4%
side extension approval rate
2,220
Side Extension decisions
1,830
Approved
390
Refused
84.0%
Brentwood overall
Side Extension applications are approved at roughly the same rate as the Brentwood average (84.0%).
How side extension compares in Brentwood
Side Extension
82.4%
Brentwood all applications
84.0%
Planning a side extension in Brentwood?
82.4% 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 Brentwood →
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect
Other project types in Brentwood
84.2%
83.5%
74.2%
83.4%
81.1%
86.4%
71.8%
84.1%
79.9%
77.1%
79.1%
82.0%
81.0%
67.4%
58.8%