Extension planning approval in Chelmsford
Based on decisions in the last 5 years, as of 29 Jun 2026.
Of 433 extension planning applications decided by Chelmsford in the last 5 years, 87% 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 Chelmsford
- Rear extension : 88% approved (314 decided)
- Roof / fenestration : 88% approved (166 decided)
- Demolition : 82% approved (146 decided)
- Side extension : 86% approved (135 decided)
- Tree work : 96% approved (121 decided)
- Two-storey extension : 84% approved (98 decided)
- Loft conversion : 88% approved (97 decided)
- Porch : 92% approved (85 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Chelmsford, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Chelmsford 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.