Planning decisions in Cardiff
As of 2 Jul 2026, covering the last 5 years.
On the public planning record, Cardiff approved 96% of 916 decided applications in the last 5 years. Here is the approval rate for the most common home-project types. It is useful before you apply and free for local reporters to cite with attribution to MyTrustedTraders.
Approval rate by project type
- Extension : 97% approved (327 decided, ~55 days)
- Rear extension : 97% approved (222 decided, ~55 days)
- Loft conversion : 94% approved (102 decided, ~55 days)
- Side extension : 96% approved (89 decided, ~53 days)
- Demolition : 96% approved (70 decided, ~56 days)
- Change of use : 94% approved (65 decided, ~45 days)
- Two-storey extension : 98% approved (41 decided, ~60 days)
Method
Figures are aggregates over the public planning decisions we hold for Cardiff, matched to a project type from the application description. Overall approval is decided-weighted across project types, using each type's rate over the last 5 years where we hold enough decisions, otherwise its full record. Only types with at least five decided applications are shown. We publish aggregate counts only, with no application references or applicant names. Full method and limits.