Side Extension approval rate in Brentwood
Brentwood approved 82.4% of side extension applications, based on 2,205 decisions analysed.
Last updated: June 2026
82.4%
side extension approval rate
2,205
Side Extension decisions
1,816
Approved
389
Refused
83.9%
Brentwood overall
Side Extension applications are approved at roughly the same rate as the Brentwood average (83.9%).
How side extension compares in Brentwood
Side Extension
82.4%
Brentwood all applications
83.9%
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
84.1%
83.5%
73.9%
83.3%
86.4%
80.9%
71.6%
84.2%
79.9%
77.0%
78.9%
81.6%
80.8%
67.4%
62.5%