O'Donnell v Dublin City Council (Approved)

Factual and Procedural Background

This Supreme Court appeal concerned the adoption by a local authority (“Defendant/Appellant”) of a city development plan for 2022–2028 insofar as it included a material alteration rezoning a third party’s lands (“Notice Party”) from an employment/enterprise zoning to a mixed-use zoning.

The Applicant/Respondent (“Plaintiff/Respondent”) owned and operated adjacent industrial lands used for heavy construction plant activities, including storage, demonstrations, and 24-hour operations, and contended that residential use on the rezoned lands would be incompatible and could lead to complaints, with relocation costs previously estimated at €15,000,000.

A planning consultant (“Planning Agent”) made a submission on behalf of Plaintiff/Respondent opposing the rezoning. The Chief Executive’s (“CE”) report published during the development plan process listed the Planning Agent (described as an organisation) in the statutory list of persons/bodies making submissions, but did not list Plaintiff/Respondent by name. The local authority later adopted the development plan including the rezoning (“Impugned Decision”).

Plaintiff/Respondent sought judicial review. The High Court (Judge [Last Name]) granted certiorari, quashing the Impugned Decision on the basis that s. 12(8)(b)(i) of the Planning and Development Act 2000 required listing the principal (Plaintiff/Respondent), not the agent. Leave for a direct appeal to the Supreme Court was granted on the basis of general public importance and exceptional circumstances.

Legal Issues Presented

1. What is the purpose/intention of the statutory requirement under s. 12(8)(b)(i) of the Planning and Development Act 2000 (as amended) for the CE’s report to list persons who made submissions on proposed material alterations to a development plan, and is that requirement satisfied by listing an agent who lodged the submission?
2. Is a breach of a mandatory statutory obligation to list persons who made submissions, without more, incapable of being treated as de minimis such that listing an agent cannot amount to substantial compliance with s. 12(8)(b)(i)?
3. What principles apply in assessing whether a breach of a statutory requirement under the 2000 Act is de minimis and/or whether it goes to certiorari of a decision?

Arguments of the Parties

Defendant/Appellant’s Arguments

• There was no pleaded case and no evidence that the listing error had any effect on the process or outcome; the CE report adequately summarised and responded to Plaintiff/Respondent’s submission.
• Legal analysis should distinguish: (i) mandatory vs directory (legislative intent/purpose), (ii) substantial compliance/de minimis (extent of deviation), and (iii) the court’s discretion to grant/refuse relief.
• The High Court over-emphasised the word “shall” and attributed an unwarranted purpose to the listing requirement.
• The listing requirement should be understood as administrative (recording/verification/transparency) rather than to “alert” elected members to particular submissions based on identity; identity is generally irrelevant to planning merits.
• Even if principal-naming were required, listing the Planning Agent was not total non-compliance and should be treated as substantial compliance or a trivial error.
• Quashing a development plan for such an error would be unworkable given the volume of submissions and risk of inadvertent mistakes; reliance was placed on Supreme Court development plan jurisprudence giving latitude due to scale and timeframes.

Plaintiff/Respondent’s Arguments

• The language of s. 12(8)(b)(i) is mandatory; applying ordinary meaning and statutory interpretation principles, the CE must list the persons/bodies who made submissions (i.e., the principal on whose behalf the submission is made), not an intermediary.
• Listing only an agent obscures the identity of the true submitter, particularly where an agent makes many submissions for different clients; this undermines the statutory function of the CE report, which is submitted to elected members for their consideration.
• Irish authority indicates courts have a severely limited capacity to excuse breaches of statutory planning procedures; non-compliance with express requirements is difficult to treat as de minimis.
• Compliance with the summary/response aspects of s. 12(8)(b) does not excuse non-compliance with the listing obligation.
• The High Court properly exercised discretion in granting certiorari and concluded the breach was not a harmless error.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
Heather Hill v. An Bord Pleanála [2022] IESC 43	Restatement of statutory interpretation principles; primacy of statutory text read in context.	Used to frame the Supreme Court’s interpretive approach to s. 12(8)(b)(i) and to quote the interpretive summary derived from The People (DPP) v. Brown.
Griffin v. Dublin City Council [2020] IEHC 507	Mandatory character of certain statutory “shall” obligations (in High Court reasoning).	Discussed as part of the High Court’s approach; the Supreme Court did not adopt the High Court’s conclusion that only the principal could satisfy the listing requirement.
Dalton v. An Bord Pleanála [2020] IEHC 27	Agency principle: acts of an agent are acts of the principal.	Referenced in High Court reasoning; Supreme Court relied on agency logic to support that either agent or principal could be said to have “made” the submission.
Killegland Estates Ltd v. Meath County Council [2023] IESC 39	General principle that planning/zoning decisions should generally be blind to ownership/identity.	Supreme Court used this to reject the High Court’s “alerting elected members” purpose as inconsistent with equal treatment of submissions on their merits.
Monaghan Urban District Council v. Alf-a-Bet Promotions Ltd [1980] ILRM 64	De minimis/substantial compliance formulation for obligatory procedures and when deviations may be overlooked.	Treated as a foundational authority in the Supreme Court’s synthesis of principles governing consequences/remedies for procedural breaches.
Byrnes v. Dublin City Council [2017] IEHC 19	Discretion to refuse relief where breach is “minor and trivial” even in planning context.	Used in the discussion of modern cases applying discretion; Supreme Court noted Gillen was not cited there, but viewed the approach as broadly aligned with discretionary analysis.
O'Connor v. An Bord Pleanála [2008] IEHC 13	High Court view (as cited below) on inability to excuse certain statutory non-compliance based on absence of prejudice.	Discussed in summarising the High Court’s approach to prejudice; Supreme Court ultimately found no breach and, hypothetically, no prejudice.
The State (Elm Developments Limited) v. An Bord Pleanála [1981] ILRM 108	Test for mandatory vs directory: whether requirement is integral/indispensable to statutory scheme.	Used in the Supreme Court’s doctrinal review and in its consolidation of the legal approach to statutory breaches.
Ballyedmond v. Commission for Energy Regulation [2006] IEHC 206	Significant unauthorised deviation from mandated statutory procedure cannot be ignored.	Considered as part of authorities on procedural compliance and the significance of deviations.
Southwood v. An Bord Pleanála [2019] IEHC 504	Courts’ jurisdiction to waive procedural planning breaches is “severely limited”; effective public participation considerations.	Used in the post-Gillen planning case survey and to contrast serious breaches affecting participation with technical breaches.
McAnenley v. An Bord Pleanála [2002] 2 IR 763	Difficulty of treating non-compliance with express statutory requirements as de minimis; discretion to withhold certiorari in an appropriate case.	Used to show that even with mandatory obligations, discretion may exist, informed by substantiality and injustice/prejudice.
Ní Chonghaile v. Galway County Council [2004] 4 IR 138	Application of de minimis and discretion where error did not mislead the public.	Used as an example where relief was refused because the error was not misleading and could be treated as de minimis.
Gillen v. Commissioner of An Garda Síochána [2012] 1 IR 574	Two-part test: (1) did legislature intend invalidity; (2) if not, substantial compliance/prejudice and circumstances inform validity/discretion.	Endorsed by the Supreme Court as the central analytical framework for consequences of statutory breaches (subject to comments on statutory interpretation per Heather Hill).
R v. Soneji [2006] 1 AC 340	Critique of rigid mandatory/directory distinction; focus on whether legislature intended invalidity.	Cited via Gillen as supporting an approach emphasising legislative intent and consequences of non-compliance.
Project Blue Sky Inc. v. Australian Broadcasting Authority (1998) 194 CLR 355	Mandatory/directory classification is a conclusion; key question is whether breach was intended to result in invalidity.	Cited via Gillen to support the interpretive focus on legislative purpose and intended consequences.
McMahon v. An Bord Pleanála [2010] IEHC 431	Judicial review remedies in planning remain discretionary; quashing does not automatically follow from any procedural defect.	Quoted within Byrnes to illustrate discretion in remedies; discussed as part of the Supreme Court’s authorities survey.
Case C-72/12 Altrip	Not every procedural defect affects a decision; a defect may be disregarded if the decision would not have been different.	Discussed in relation to “harmless error” language and as informing discretionary refusal of relief where no material effect is shown.
Carrownagowan Concern Group v. An Bord Pleanála (No. 3) [2024] IEHC 549	Domestic endorsement of “harmless error” framing; discretionary refusal where breach causes no effects.	Cited as part of the harmless error strand of jurisprudence.
Doyle v. An Bord Pleanála [2025] IEHC 158	Summary of harmless error doctrine: decisions should not be quashed for errors that make no material difference absent a mandatory invalidity rule.	Cited to explain the harmless error approach as compatible with discretionary judicial review principles.
The State (Toft) v. Galway Corporation [1981] ILRM 439	Example relating to prejudice as a discretionary factor.	Cited as an illustration supporting the view that absence of prejudice aligns with “harmless error”.
Blessington and District Community v. Wicklow County Council [1997] 1 IR 273	Example relating to prejudice and discretionary relief in public law.	Cited as an illustration supporting the role of prejudice in remedy/harmless error analysis.
Donegal County Council v. Quinn [2025] IESC 19	Where legislation requires naming the person who applied, identifying either a principal or an agent acting on behalf may satisfy the requirement.	Applied by analogy to support the conclusion that listing either the Planning Agent, the principal, or “agent on behalf of principal” could comply with s. 12(8)(b)(i).
The People (DPP) v. Brown [2019] 2 IR 1	Statutory interpretation principles (as approved and summarised in Heather Hill).	Used indirectly through quotation in Heather Hill to articulate the interpretive method applied to the statute.
Save Cork City Community Association CLG v. An Bord Pleanála [2024] 1 IR 205	Workable and coherent interpretation of statutes; citation of Waltham Abbey.	Cited to support reading s. 12(8)(b)(i) in a way that is workable given the scale/timeframe of development plans.
Waltham Abbey v. An Bord Pleanála [2022] 2 ILRM 417	Statutes should be read, where possible, to produce a workable and coherent interpretation.	Used to support construing the listing obligation so it does not impose impractical investigatory burdens on planning authorities.
McGarrell Reilly v. Meath County Council [2023] IESC 40	Latitude in development plan judicial review due to scale/timeframe/nature (as characterised in submissions).	Relied upon in Defendant/Appellant’s submissions as part of the argument against quashing for a trivial error.

Court's Reasoning and Analysis

1) Interpretation of s. 12(8)(b)(i): no breach. The Supreme Court applied the statutory interpretation approach as restated in Heather Hill: begin with the ordinary and natural meaning of the words, read them in context, and resort to purpose only if ambiguity remains. On the text (“list the persons…who made submissions”), the Court held that the “person” who made a submission could properly be the Planning Agent who performed the operational act of lodging it, the principal on whose behalf it was made (because an agent’s acts are the principal’s acts), or the formulation “agent on behalf of principal.” Accordingly, the Court held that listing the Planning Agent alone could satisfy the statutory requirement.

The Court reinforced this reading by analogy with Donegal County Council v. Quinn, where a statutory requirement to specify the “person who applied” for a summons could be met by naming either the principal prosecutor or the solicitor-agent (or both).

2) Context and workability. The Court emphasised the scale, timeframe, and administrative burden of development plan-making (including over a thousand submissions within a statutory eight-week period to list, summarise, and respond). The Court reasoned that requiring the CE to “look behind” the name of the person who lodged a submission to determine whether they were agent or principal could impose a significant additional burden and risk delay, contrary to a workable construction of the statutory scheme. The Court preferred a construction producing a “workable and coherent” interpretation.

3) Purpose of the listing requirement (addressed for completeness). Although not strictly necessary given the absence of ambiguity, the Court considered competing accounts of purpose. It preferred Defendant/Appellant’s view that the listing requirement serves an administrative, non-planning function of formally recording receipt of submissions (in the absence of individual acknowledgements). The Court rejected the High Court’s view that listing names was meant to “alert” elected members to particular submissions based on identity, finding that approach inconsistent with the principle that submissions should be considered on their merits and that planning should generally be blind to ownership/identity. The Court also noted that the original legislation did not facilitate elected members accessing the full submissions (online access being introduced later), which undercut an “alerting” rationale, and that the High Court’s purposive account involved speculation without evidence from elected members.

4) Consequences of breach and remedy (answered notwithstanding the finding of no breach). Because the questions were fully argued and of general public importance, the Court endorsed the two-part Gillen framework: (i) whether the legislature intended invalidity for non-compliance (a matter of statutory interpretation per Heather Hill), and (ii) if not, whether the court should grant certiorari in its discretion, having regard to circumstances including substantial compliance, whether the breach is trivial/technical/de minimis, prejudice (including to the public), and the public interest.

5) Hypothetical application if there had been a breach. Assuming (contrary to the Court’s conclusion) that listing the Planning Agent instead of the principal were a breach, the Court would still find no legislative intention of total invalidity and would treat the error as trivial/technical/de minimis. The Court accepted there was no evidence that the listing had any effect on the plan-making process or the Impugned Decision and therefore would regard it as a “harmless error.” On that hypothesis, the Court stated it would refuse certiorari in the exercise of discretion.

Holding and Implications

ALLOWED: The Supreme Court allowed the appeal and set aside the High Court’s order quashing the Impugned Decision.

The direct effect was that the High Court’s certiorari order, granted solely because the CE report listed the Planning Agent rather than Plaintiff/Respondent, could not stand because (on the Supreme Court’s interpretation) the statutory requirement in s. 12(8)(b)(i) was satisfied by listing either agent, principal, or agent on behalf of principal.

The judgment also endorsed a structured approach (derived from Gillen) to determining the consequences of statutory procedural breaches and the discretionary grant of certiorari, including consideration of triviality/de minimis character, prejudice, and the public interest; however, the Court’s core disposition rested on the finding that no breach occurred on the facts.