Side Extension approval rate in Brentwood
Brentwood approved 81.8% of side extension applications, based on 2,251 decisions analysed.
Last updated: September 2026
81.8%
side extension approval rate
2,251
Side Extension decisions
1,841
Approved
410
Refused
79.4%
Brentwood overall
Side Extension applications are approved more often than the Brentwood average (79.4%), suggesting the council is relatively receptive to these projects.
How side extension compares in Brentwood
Side Extension
81.8%
Brentwood all applications
79.4%
Planning a side extension in Brentwood?
81.8% 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
Planning professional? PlanningLens runs refusal alerts and evidence packs for Brentwood and any other published UK council — see the data services →
Other project types in Brentwood
83.5%
83.2%
73.1%
83.2%
79.8%
86.1%
70.1%
84.0%
79.7%
76.9%
76.3%
82.0%
81.0%
67.4%
55.6%