Judicial review of a planning decision in Ireland — eight weeks, substantial grounds, and who may bring one

An Coimisiún Pleanála (formerly An Bord Pleanála) decided 510 appeals from the seven Greater Dublin Area councils we index in the 12 months to 12 September 2026, granting 324 and refusing 181. Every one of those decisions opened an eight-week window in which the only remaining challenge is judicial review in the High Court. Today 112 of those windows are open across the seven councils. Judicial review is not a third appeal. The court does not decide whether the permission was a good idea; it decides whether the Commission, or the council, was entitled in law to decide as it did. Most people who ask about it want the first thing and can only have the second.

What s.50 allows

Section 50(2) of the Planning and Development Act 2000 says a decision of a planning authority or the Commission may not be questioned except by judicial review under Order 84 of the Rules of the Superior Courts. Section 50(6) gives eight weeks from the date of the decision. Section 50(8) lets the court extend that only where there is good and sufficient reason and the delay was outside the applicant's control. The eight weeks run from the decision, not from when you heard of it, and the courts have refused extensions for applicants who were waiting on a solicitor's letter.

Under s.50A(3) the court grants leave only where there are substantial grounds, meaning arguable and weighty rather than trivial, and the applicant has a sufficient interest. Sufficient interest is not limited to owning property nearby, but the courts look for participation: a person who made an observation or an appeal is in a far stronger position than one who did not. An environmental organisation that has pursued environmental aims for at least twelve months has standing on environmental grounds without showing a personal interest.

The grounds are legal. A material contravention of the development plan without the justification s.37(2)(b) requires; an environmental impact assessment or appropriate assessment screening not done or not reasoned; a report the inspector did not consider; a notice defective enough that the public could not participate; a condition outside the Commission's powers. "The inspector got the overlooking wrong" is not a ground unless no reasonable decision-maker could have reached that view, which is a bar almost nobody clears.

What the court can do

The usual order is certiorari: the decision is quashed and the matter goes back to the Commission to decide again, under s.50A(9A), often on a narrow point with the rest of the decision left standing. The court does not grant or refuse permission itself. A developer who wins on remittal gets the same permission with a better statement of reasons; an objector who wins gets a second decision, not a refusal. Building may continue while the case is heard unless the court grants a stay, and a stay usually needs an undertaking as to damages.

An appeal from the High Court needs leave and a point of law of exceptional public importance under s.50A(7), or a leapfrog to the Supreme Court. Cases run in the Planning and Environment List under practice direction HC124, with a target of a hearing within a year of leave.

What it costs and who pays

Judicial review is High Court litigation: solicitor, junior and often senior counsel, and a hearing of two to five days. Both sides' costs in a contested case run well into six figures. The ordinary rule is that costs follow the event, and an unsuccessful applicant pays the Commission's costs and, where the developer joined as notice party, theirs too. Section 50B changes that for cases about EIA, integrated pollution control or strategic environmental assessment: each side bears its own costs, and a successful applicant may recover theirs. The Environment (Miscellaneous Provisions) Act 2011 extends similar protection to other cases about environmental law. Whether your case is inside or outside those rules is the first question a solicitor answers, because it decides whether losing costs you your own fees or everyone's.

What we see in the Legal Diary

We hold 134 entries from the High Court's Planning and Environment List, with the parties and listing dates but not the pleadings, because the Legal Diary now blocks automated reading. Of the cases listed on 6 July 2026, the Commission was respondent in most: Rabbitt v An Coimisiún Pleanála, Ballycar Green Energy Ltd v An Coimisiún Pleanála, and an EirGrid case were on the same day's list. Councils appear as respondents in Part 8 and development plan cases, Cork City Council and Tipperary among them. The record numbers with the suffix /JR are the planning reviews; a number ending /P is a plenary action and a different animal. Our reading: judicial review is a developer's and an NGO's tool far more than a neighbour's, because the eight weeks and the costs exposure are built for parties who litigate for a living. A neighbour's money is better spent on the €20 observation and the €220 appeal, which are where the merits are decided.

What the 2024 Act changes

Part 9 of the Planning and Development Act 2024 rewrites judicial review. It ties standing to participation: under s.286, a person who did not make a submission at the earlier stage will generally not be able to seek review, with exceptions for those who could not have. An unincorporated body such as a residents' association must show it has been in existence for a period, has a minimum membership, and that a majority of its members voted for the proceedings. The Act also provides for a legal costs scheme in place of the s.50B rules. Part 9 commences by ministerial order in stages, and as of 12 September 2026 you should check which sections are in force before relying on either the old rules or the new. The Oireachtas Library & Research Service briefing of December 2025 tracks the commencements.

Find the open windows

The deadlines page lists every Commission decision on a Dublin-area case whose eight-week window is still open, with the decision date. The appeal guide covers the step before this one, and the Dún Laoghaire-Rathdown place page shows the council's live appeal figures.

Figures from the register on 12 September 2026 (live callouts refresh hourly); law checked 12 September 2026. Check with the council or a planning consultant before relying on this.

Frequently asked questions

How long do I have to judicially review a planning decision?

Eight weeks from the date of the decision under s.50(6) of the 2000 Act. The court can extend the period only for good and sufficient reason where the delay was outside your control.

Can I judicially review a decision if I did not object?

Under the 2000 Act you need a sufficient interest, and participation weighs heavily. Under s.286 of the 2024 Act, once commenced, a person who did not make a submission will generally be barred, with limited exceptions.

What does a planning judicial review cost?

High Court costs on both sides, usually well into six figures for a contested case. Outside the s.50B and 2011 Act protections, the loser pays the winner's costs; inside them, each side bears its own.

Can the court refuse the planning permission?

No. The court can quash the decision and send it back to the Commission or the council to decide again. It does not decide the merits, and the second decision may be the same.

Does building stop while a judicial review is heard?

Not automatically. The developer may proceed at its own risk unless the court grants a stay, which usually requires the applicant to give an undertaking as to damages.