Side extension planning approval in Brentwood
Based on decisions in the last 5 years, as of 24 Jun 2026.
Of 127 side extension planning applications decided by Brentwood in the last 5 years, 86% were approved. This is the council's track record for this kind of work. It is a useful gauge before you apply, not a guarantee for any one application.
Other work in Brentwood
- Extension : 86% approved (450 decided)
- Rear extension : 86% approved (335 decided)
- Roof / fenestration : 85% approved (299 decided)
- Demolition : 87% approved (297 decided)
- Loft conversion : 86% approved (156 decided)
- Tree work : 99% approved (149 decided)
- Porch : 88% approved (106 decided)
- Two-storey extension : 77% approved (99 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Brentwood, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Brentwood decides today, with the longer record as context. A rate is only shown once there are enough decided applications for it to be reliable. We publish aggregate figures only, never an individual application or applicant name. Read the full method and limits.