Summary of Judgment

Factual and Procedural Background

The Applicants challenged the grant of permission for an onshore renewable energy (wind farm) project under section 50, 50A and 50B of the Planning and Development Act 2000 (as amended). An inspector and the statutory planning authority approved the project. The Applicants brought judicial review proceedings. In the substantive judgment the High Court dismissed the Applicants' claim for certiorari and granted limited declaratory relief on one core ground. The Applicants sought a certificate for leave to appeal to the Supreme Court against that substantive judgment. The application for certificate progressed by written submissions and a hearing before Judge Humphreys. A draft of the present judgment was circulated to parties for comment prior to finalisation.

Legal Issues Presented

1. Whether the design flexibility allowed in the permission (variations in total height, hub height and blade diameter across turbines) is consistent with Articles 17, 18, 19, 22 and 23 of the Planning and Development Regulations 2001, and whether departures from those provisions go to jurisdiction or may be treated as de minimis.
2. Where there is alleged non-compliance with Articles 17, 18, 19, 22 and 23, whether the burden lies on an applicant to adduce evidence of a planning issue, or whether the person seeking to be excused from strict compliance must prove absence of planning impact.
3. Whether assertions that multiplicity of design options made it impossible to assess effects (landscape/visual amenity, noise, shadow flicker, avian impacts, residential amenity) amount to "evidence" of a genuine planning issue for the purposes of paragraph 57.12.i of the substantive judgment.

Arguments of the Parties

Applicants' Arguments

• The Applicants contended that the permission impermissibly allowed design flexibility (multiple, variable heights and blade diameters) contrary to the Planning and Development Regulations 2001.
• The Applicants argued that any such non-compliance should be treated as jurisdictional and that flexibility could not be excused as de minimis.
• The Applicants asserted that the multiplicity of options meant that evidence of potential planning impacts could not be properly made or assessed.

Defendant's Arguments

• The Defendant submitted that the Applicants misread the substantive judgment and that there was no demonstrable non-compliance with the Regulations as a factual matter.
• The Defendant relied on the principle that reasonable design flexibility that does not give rise to a planning issue is permissible and that the Applicants had not proved otherwise.
• The Defendant submitted that the proposed points did not properly arise, were not points of law of public importance and were not suitable for certification.

Notice Party (Company A) Arguments

• Company A submitted that the Applicants' certificate application was premised on a misreading of the substantive judgment and should be refused without further consideration.
• Company A emphasised the public interest in timely completion of renewable energy infrastructure and the prejudice of further delay to the developer.
• Company A pointed to statutory and legislative developments addressing design flexibility and submitted any appellate decision about pre-amendment flexibility would have limited future relevance.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
Waltham Abbey Residents Association v. An Bord Pleanála [2022] IESC 30	That planning regulations must be given a workable interpretation.	The Court relied on this authority to reject a strict exclusion of reasonable design flexibility.
Boland v. An Bord Pleanála [1996] 3 I.R. 435	That conditions in planning permissions may afford a limited degree of flexibility (case-by-case).	The Court treated Boland as consistent with permitting reasonable flexibility where no planning issue arises.
Ambrose v. Shevlin [2015] IESC 10	Comment that a trial in High Court is not a dress rehearsal.	Quoted to support principle that points not argued at trial should not be pursued on appeal.
Cave Projects Ltd v. Gilhooley [2025] IESC 3	This precedent was cited in relation to the Ambrose passage.	The Court cited it for the same general proposition about conduct of litigation; specific application was not elaborated further in the opinion.
Hoctor v. An Coimisiún Pleanála (No. 1) [2026] IEHC 65	Principal substantive judgment in these proceedings (dismissal of certiorari; declaratory relief on one ground).	The present application for a certificate sought leave to appeal that judgment; the Court assessed whether questions arose from it.
Concerned Residents of Treascon and Clondoolusk v. An Bord Pleanála & Ors. [2024] IESC 28	That the point must fall within the pleadings to properly arise for appeal.	Used to support the requirement that issues certified must have arisen at trial and in the pleadings.
Leech v. An Bord Pleanála [2025] IESCDET 106	That issues of pleading and alleged misinterpretation of administrative decisions are usually case-specific and not matters of public importance.	Relied upon to represent limits on certifying pleading/misinterpretation arguments.
Minister for Justice and Equality v. Andrzejczak (No. 2) [2018] IEHC 11	That the question must actually arise on the facts (avoid abstract questions).	Cited for the proposition that certified questions must be factually engaged in the case.
GOCE Limited v. An Bord Pleanála [2025] IEHC 43	That the question must actually have been argued by the would-be appellant.	Cited to support refusal where new issues are launched solely for appeal.
S.A. v. Minister for Justice and Equality (No. 2) [2016] IEHC 646	That the point should make a difference to the outcome and be determinative in some sense; time limits for leave.	Used to underline that appeal questions must be outcome-determinative and timely.
Morehart v. An Bord Pleanála [2025] IEHC 701	That a point should make a difference to the outcome.	Referenced as part of cumulative criteria for certification.
Rooney v. Minister for Agriculture and Food [2016] IESC 1	Warning against litigants focusing on a debatable point while ignoring wider case flaws.	Quoted to caution against appeal based on isolated points that do not change overall result.
Monkstown Road Residents Association v. An Bord Pleanála [2023] IEHC 9	That a question must accurately reflect the judgment and not exaggerate it.	Applied to reject proposed appeal questions that distorted the trial judgment.
Stapleton v. An Bord Pleanála [2025] IEHC 178	That certification should not invite an appellate court to write an essay; novelty is not determinative.	Cited in relation to requirements for specificity and public importance.
Cooper v. An Bord Pleanála [2025] IESCDET 96	That misunderstanding of legal situation does not amount to matter of public importance.	Quoted to support that mere disagreement with conclusions does not by itself establish public importance.
B.S. v. Director of Public Prosecutions [2017] IESCDET 134	That questions about application of law to facts are mixed questions and generally unsuitable for appeal.	Cited to restrict certification to pure points of law rather than mixed fact-law issues.
Halpin v. An Bord Pleanála [2020] IEHC 218	Related to application of established principles to particular facts.	Referenced to show limits on appeals about application of law to specific facts.
Rushe v. An Bord Pleanála [2020] IEHC 429	General observations on finality and role of High Court on planning judicial review.	Used to emphasise statutory intention that most planning challenges finish in the High Court.
Stanley v. An Bord Pleanála [2022] IEHC 671	Authority cited regarding mixed law-and-fact questions.	Applied as part of the Court's analysis limiting certifiable points.
Eco Advocacy CLG v. An Bord Pleanála, Keegan Land Holdings Limited, An Taisce - The National Trust for Ireland and Client Earth AISBL [2024] IESCDET 62	That questions should transcend the facts to be of public importance.	Cited to support view that the proposed questions were fact-specific and unsuitable.
Nagle View Turbine Aware Group v. An Bord Pleanála (No. 2) [2025] IEHC 3	That where law is not uncertain, public interest suggests an appeal is not warranted; nature of project and delay matter.	Relied on to weigh public interest against granting leave given infrastructure and delay considerations.
R.A. v. Refugee Appeals Tribunal [2015] IEHC 830	That if solid case for leave exists, it will be granted.	Referenced for context on when leave is appropriate.
B.W. v. Refugee Appeals Tribunal [2015] IEHC 833	Similar procedural context.	Listed among authorities on certification practice; specific application not elaborated in the opinion.
K.R.A. v. Minister for Justice and Equality (No. 2) [2016] IEHC 421	Procedural authorities on leave to appeal.	Included in survey of authorities; specific proposition not separately summarised in the opinion.
S.T.E. v. Minister for Justice and Equality [2016] IEHC 544	Procedural authority.	Included in authority list; the opinion does not set out a distinct rule from it.
R.A. v. Refugee Appeals Tribunal (No. 3) [2016] IEHC 671	Procedural authority on leave.	Listed among cases illustrating when leave is granted.
B.S. (India) & Anor. v. Minister for Justice and Equality & Ors. (No. 3) [2020] IEHC 485	Procedural authority on leave.	Cited in the list of precedent; no discrete application set out in the text.
Dublin City Council v. An Bord Pleanála (No. 2) [2021] IEHC 34	Procedural authority on certification/leave.	Included in the authority list for context.
Waltham Abbey Residents Association v. An Bord Pleanála [2021] IEHC 597	Earlier High Court authority cited in the procedural list.	Listed among authorities; the opinion uses Waltham Abbey IESC [2022] more substantively.
Sweetman v. An Bord Pleanála XVII (No. 1) [2021] IEHC 390	Support for concept of reasonable design flexibility.	The Court noted these authorities supported reasonableness of design flexibility; they were not central to the principal judgment.
Sweetman v. An Bord Pleanála XVII (No. 2) [2021] IEHC 662	Support for reasonable design flexibility concept.	Referenced as consistent with the principal judgment's approach to flexibility.
Save Roscam Peninsula CLG v. An Bord Pleanála (No. 2) [2022] IEHC 328	Procedural authority on finality and leave.	Listed among authorities on scope of appeals in planning cases.
Joyce-Kemper v. An Bord Pleanála (No. 5) [2022] IEHC 349	Procedural authority.	Included in the list; specific rule not separately described in the opinion.
Kerins v. An Bord Pleanála (No. 5) [2023] IEHC 280	Procedural authority.	Included in the survey of authorities.
Coolglass v. An Bord Pleanála [2025] IEHC 1	Procedural authority.	Cited in the list of cases relevant to certification practice.
Heavey v. An Bord Pleanála (No. 2) [2025] IEHC 311	Procedural authority.	Listed among precedents on leave and finality; the opinion does not extract a separate rule.
Krikke v. Barranafaddock Sustainability Electricity Limited [2019] IEHC 825	A different context regarding material deviation from permissions.	The Court observed that no inconsistency arose when distinctions in context and later appellate conclusions were considered.
Bailey v. Kilvinane Wind Farm [2016] IECA 92	Example where deviation from a permission was held material.	Noted as authority that deviations can be material, but did not make permissions allowing flexibility unlawful.
Attorney General v. Crosland (No. 2) [2021] UKSC 58	On confidentiality and restriction on publication of draft judgments.	Cited to justify directions restricting dissemination of draft judgments.
Baigent v. Random House Group Ltd [2006] EWHC 1131	Authority referenced in context of confidentiality of drafts.	Listed supporting the court's directions on draft judgments; no separate application beyond that context.
R. (Counsel General for Wales) v. Secretary of State for Business, Energy and Industrial Strategy [2022] EWCA Civ 181	Authority referenced concerning draft judgments and publication restrictions.	Cited as part of authorities supporting confidentiality of drafts; no further application in the opinion.
Public Institution for Social Security v. Banque Pictet & Cie SA and others [2022] EWCA Civ 368	Another authority cited on draft confidentiality.	Included among authorities on confidentiality; specific application not expanded.
Itkin v. Wood [2023] JRC 101	Authority concerning draft judgments (Royal Court of Jersey).	Cited to support confidentiality direction; no further rule extracted.
Carrownagowan Concern Group v. An Bord Pleanála [2025] IESCDET 8	That inclusion of a request for a CJEU reference does not convert an unsuitable point into one appropriate for appeal.	Cited to show that procedural devices do not salvage unsuitable certification points.
Carrownagowan Concern Group v. An Bord Pleanála [2025] IESCDET 9	Similar proposition regarding suitability of points for appeal.	Referenced in relation to CJEU reference and unsuitability of abstract points.
Phoenix Rock Enterprises v. An Bord Pleanála & Ors. [2023] IESCDET 97	Requirement that assertions of practical problems be backed by evidence.	Cited to reject unsubstantiated claims of industry-wide difficulties as basis for appeal.
McCaffrey v. An Bord Pleanála [2024] IEHC 476	Addressing claims of practical difficulty and leave to appeal; leave refused at IESCDET 145.	Used to show need for evidential support for claims of practical uncertainty; leave refused on appeal.
Callaghan v. An Bord Pleanála [2015] IEHC 493	That novelty alone does not make a point suitable for appeal.	Cited to undercut argument that mere novelty warrants certification.
Maguire T/A Frank Pratt & Sons (No. 2) [2023] IEHC 209	That disagreement with a conclusion does not turn settled law into uncertainty.	Applied to reject Applicants' attempt to characterise settled law as uncertain.
Dunnes Stores v. An Bord Pleanála [2015] IEHC 387	That subsection 50A(7) is designed to secure expedition and certainty to prevent delay to major public infrastructure.	Relied upon to weigh public interest against granting leave given risk of further delay.
Carrownagowan Concern Group v An Bord Pleanála [2024] IEHC 549	That renewable energy projects may be in the overriding public interest under EU law; public interest considerations weigh against delay.	Used to support the public interest factor favouring refusal of leave given the renewable energy context.
Rushe [2020] IEHC 429	That s.50A(7) indicates the Oireachtas intended High Court decisions in planning cases to be generally final.	Cited to reinforce statutory intent that most planning judicial review litigation should conclude in the High Court.
Hellfire Massy Residents Association v. An Bord Pleanála [2022] IESC 38	That appeals based on misunderstanding of a principal judgment are not in the public interest.	Quoted to show public interest disfavors appeals that spread confusion arising from misreading of trial judgments.
Condon (No.2) [2026] IEHC 136	That workable interpretation of the law is required and appeals based on misunderstanding are disfavoured.	The opinion noted Condon (No.2) to parallel reasoning on workable interpretation and public interest.
Massey (No.4) [2025] IEHC 309	Authority consistent with public interest considerations against further appeal.	Cited to support the view that certification was not in the public interest in the present case.

Court's Reasoning and Analysis

Judge Humphreys analysed the certificate application against the statutory criteria for leave to appeal. The Court applied the familiar cumulative tests: (i) the points must properly arise (fall within the pleadings and have been argued at trial); (ii) they must be points of law (not purely factual or mixed fact-law questions); (iii) they must be of exceptional public importance; and (iv) an appeal must be in the public interest. The Court concluded:

• The Applicants' proposed questions were premised on a misreading of the substantive judgment and an incorrect factual premise of regulatory non-compliance.
• The first and third proposed questions were applications of law to facts (mixed questions) rather than pure points of law; the second question, even if viewed as legal, was disconnected from the principal judgment because there was no proven non-compliance.
• The questions were fact-specific, would not resolve general doubt, and thus were not of public importance or of exceptional public importance.
• The Applicants had not engaged with the rationale of the High Court judgment or shown a plausible basis for contending it was wrong; many of the arguments and authorities now advanced were not relied upon at trial and appeared to be manufactured for appeal.
• Countervailing public interest considerations—particularly the public interest in timely delivery of renewable energy infrastructure and the prejudice of further delay to the developer—strongly weighed against certification.
• The Court emphasised precedent supporting a workable interpretation of planning regulations permitting reasonable design flexibility where no planning issue arises, and noted legislative amendments addressing design flexibility.

Holding and Implications

Holding: The application for leave to appeal (certificate) was refused and the application for leave to appeal was dismissed.

Implications:

• The High Court concluded there was no basis to certify questions of law of exceptional public importance arising from the substantive judgment.
• The direct effect is that the substantive High Court judgment stands and no appeal will proceed (subject to any leapfrog application to the Supreme Court). The Court ordered dismissal of the certificate application and specified costs provisions depending on any subsequent leapfrog application.
• The decision reinforces that reasonable design flexibility, where it does not create a planning issue, is permissible under existing jurisprudence, and that speculative or newly-formulated points not raised at trial are unlikely to be certified for appeal.

Order

• The application for leave to appeal is dismissed.
• If a leapfrog application to the Supreme Court is made and acceded to, costs of the leave application are costs in that appeal; otherwise there is no order as to costs of the leave application.
• If a leapfrog application is made within 28 days, there is a stay on execution of costs already ordered until final determination.
• The order and the earlier substantive order are to be perfected forthwith as the final orders of the High Court.