Summary of Judgment

Factual and Procedural Background

The Plaintiffs commenced proceedings on 3 October 2025 challenging the validity of the "Design Standards for Apartments, Guidelines for Planning Authorities" issued on 8 July 2025. The Guidelines were adopted under section 28 of the Planning and Development Act 2000 and contain both non‑binding text and binding Specific Planning Policy Requirements ("SPPRs"). The Defendant confirmed on 29 July 2025 that no strategic environmental assessment (SEA) or screening for SEA was carried out prior to publication. The matter was heard on 4 December 2025. The referring High Court (Judge Humphreys) considered that it was acte clair that the non‑binding text does not require SEA, but that issues remained concerning the binding SPPRs. The High Court stayed the proceedings and referred questions to the Court of Justice of the European Union (CJEU) for a preliminary ruling; it also requested priority treatment under Article 53(3) of the CJEU Rules of Procedure.

Legal Issues Presented

1. Whether Article 3 of Directive 2001/42 should be interpreted and/or applied so as to give effect to Articles 7 and/or 8 of the Aarhus Convention and/or Article 8 of the Kyiv Protocol to the fullest extent possible.
2. Whether the notion of a "framework for future development consent" in Article 3(2)(a) of Directive 2001/42 includes binding legal requirements (such as the SPPRs in the Guidelines) relating to the design of apartments if they affect (subject to other legal requirements) the number of housing units within a project and/or their internal features and/or (consequentially) their external appearance, even if they do not directly affect the number, location, size, operating conditions or funding of apartment projects themselves.
3. If the answer to question 2 is No, whether the notion in Article 3(2)(a) includes binding legal requirements (such as the SPPRs) relating to apartment design where they derogate from other plans that were required to, and/or were in fact, subject to SEA under the Directive.

Arguments of the Parties

Plaintiffs' Arguments

• Article 3 must be interpreted compatibly with the Aarhus Convention and the Kyiv Protocol; EU obligations require such interpretation (proposed answer to Q1: Yes).
• Binding design requirements that affect unit numbers/internal features/external appearance fall within the "framework for future development consent" in Article 3(2)(a) and thus require SEA (proposed answer to Q2: Yes).
• If Q2 is answered No, a derogation from plans that were required to or were subject to SEA nevertheless brings the measure within Article 3(2)(a) (proposed answer to Q3: Yes).

Defendant's Arguments

• The question in Q1 is unnecessary for resolution of the dispute and should not be referred as an abstract or advisory issue (relied on CJEU jurisprudence on the necessity of references).
• The SPPRs do not "set the framework for future development consent" because they do not establish a significant body of criteria and detailed rules regarding location, nature, size, operating conditions or allocation of resources for projects listed in the relevant Annexes (proposed answer to Q2: No).
• Where SPPRs do not themselves establish such a significant body of criteria, derogation from other plans that had been subject to SEA does not convert the SPPRs into a measure falling within Article 3(2)(a) (proposed answer to Q3: No).

Referring Court's (High Court) Position

• The referring court proposes answers of Yes to Q1 and Q2, and (if reached) Yes to Q3; it considers the issues concrete and relevant to the case because the SPPRs are binding and may derogate from previously assessed plans.
• The court expressed concern that absence of Aarhus/Kyiv‑compliant procedures when adopting binding SPPRs could leave a gap in public participation and environmental assessment.
• The court requested priority treatment of the reference under Article 53(3) of the CJEU Rules of Procedure.

Table of Precedents Cited

Court's Reasoning and Analysis

The High Court identified the central legal issue as the interpretation of Article 3 of Directive 2001/42, in particular the meaning of plans or programmes "which set the framework for future development consent" in Article 3(2)(a). The court noted that the Guidelines comprise non‑binding text and binding SPPRs adopted under section 28 of the 2000 Act. The court considered existing CJEU authority to treat non‑binding text as not requiring SEA (citing C‑9/22) and recognised that the SPPRs are binding requirements that affect the internal design, number of units and, consequentially, external appearance of apartment projects. The Defendant had confirmed no SEA was carried out. Given (i) the binding nature of the SPPRs, (ii) their potential to derogate from development plans that had been subject to SEA, and (iii) unresolved questions about whether such measures fall within Article 3(2)(a) (or bring themselves within scope by derogating from previously assessed plans), the court concluded that answers from the CJEU are necessary. The High Court therefore stayed the domestic proceedings and referred three questions to the CJEU. The court also requested that the CJEU afford priority to the reference and noted procedural observations including the parties' positions on anonymity for natural persons.

Holding and Implications

Core Ruling: Questions referred to the Court of Justice pursuant to Article 267 TFEU.

Direct consequences ordered by the High Court:

• The three questions set out in the judgment are referred to the CJEU for a preliminary ruling.
• The High Court respectfully requested that the CJEU afford priority to the reference under Article 53(3) of its Rules of Procedure.
• The court noted the natural persons' request not to be anonymised before the CJEU.
• The substantive determination of the domestic proceedings is adjourned pending the CJEU's judgment, without prejudice to interim or procedural matters.

No substantive ruling was made by the High Court on the validity of the Guidelines; the court confined itself to referring questions of EU law to the CJEU. The opinion does not purport to set or alter binding precedent on the substantive points raised; it seeks a preliminary ruling to resolve them.