Judicial Review vs Appeal: What's the Difference?

Two doors lead away from a bad decision. Behind one, an appeal: a body that can look at the decision again and change it. Behind the other, judicial review: a court that can examine only how the decision was made. Choosing the wrong door — or the right doors in the wrong order — loses winnable cases.

What Each One Asks

An appeal asks: was the decision right? The appellate body rehears or reviews the merits and can substitute its own conclusion — grant what was refused, reduce what was imposed. Judicial review asks: was the decision lawful? The High Court checks powers, procedures, reasons and rationality — and if the process fails, quashes and remits. It will not re-weigh evidence or substitute its view of the merits, however sympathetic the facts. Foundations: what is judicial review?

The Exhaustion Rule

Where the Oireachtas built an appeal — welfare appeals, section 29 education appeals, tax appeals, licensing appeals to the District Court — the courts expect it used before review. The rule is about adequacy: an appeal that can fully cure the complaint should be given the chance. The exceptions track the rule’s logic: no obligation to use a remedy that cannot cure the defect, or whose pursuit would destroy the case through delay.

The Traps

• Appealing when the process was the problem: a merits appeal can leave a fundamental procedural defect unexamined — and time-bar the review that would have caught it;
• Reviewing when the merits were the problem: a technically perfect process producing a decision you simply disagree with is not reviewable;
• Two clocks, one calendar: appeal deadlines are often shorter than review limits; missing either forecloses that door. Both must be established on day one — see the time limits;
• Assuming the appeal body is the end: appeals officers and committees are themselves public decision-makers — their decisions are reviewable too.

The Practical Method

List every route the decision letter mentions and every one it does not. Date every deadline. Ask of each route: can it actually fix what went wrong here? Then sequence. That analysis takes a solicitor one conversation — and it is the conversation that protects everything after it. Our screener frames it: Can I judicially review this decision?