Leave to Appeal

Leave to appeal is a procedural gatekeeping mechanism used in many common-law and mixed jurisdictions. Rather than granting an automatic right of appeal, the legal system requires the would-be appellant to first obtain the court's permission—either from the court whose decision is being challenged or from the appellate court itself. The requirement filters out unmeritorious appeals, conserves judicial resources, and ensures that higher courts focus on cases raising significant legal issues.

The test for granting leave varies by jurisdiction and court level. Common thresholds include whether the appeal raises an arguable point, has a real prospect of success, involves a question of general public importance, or concerns a point of law worth clarifying. In the United Kingdom, for instance, appeals to the Supreme Court typically require permission and are granted only where an arguable point of law of general public importance is raised. In Canada, leave to appeal to the Supreme Court under section 40 of the Supreme Court Act turns on whether the issue is of public importance.

Leave can be:

• First-instance leave — sought from the trial or lower appellate court immediately after judgment.
• Renewed leave — sought directly from the appellate court if the lower court refuses.
• Leave to appeal out of time — permission to bring an appeal after the statutory deadline has expired, usually requiring a good explanation for delay.

In international and supranational contexts, similar gatekeeping exists. The European Court of Human Rights uses an admissibility stage that functions analogously, and the International Criminal Court requires leave under Article 82 of the Rome Statute for interlocutory appeals on most issues.

Refusal of leave is generally final; it does not constitute a ruling on the merits but ends the appellate process for that party. For researchers tracking jurisprudence, distinguishing "leave refused" from a substantive judgment matters: the underlying legal point remains unsettled at the higher court.