EIA Screening in Ireland: Why the Recent High Court Ruling Matters for Projects in the Planning Pipeline
A recent High Court ruling has raised significant questions around how Ireland determines whether Environmental Impact Assessment (EIA) is required and it could have immediate implications for projects currently progressing through the planning system.
The decision in Shorten v An Coimisiún Pleanála IEHC 517, delivered on 24 July 2026, concerns the compatibility of Ireland’s “preliminary examination” approach with the requirements of the EU EIA Directive. While the case itself relates to a residential development in Glenealy, Co. Wicklow, the implications extend well beyond housing and could affect how EIA screening is approached across a much wider range of developments.
What is the issue?
The Environmental Impact Assessment Directive (Directive 2011/92/EU, as amended by Directive 2014/52/EU) establishes the European framework for determining which projects require an Environmental Impact Assessment (EIA). The Directive identifies projects for which EIA is mandatory in Annex I (Schedule 5, Part 1 of the Planning and Development Regulations 2001, as amended), while Annex II (Schedule 5, Part 2) identifies projects for which Member States must determine, through thresholds and/or case-by-case examination, whether significant effects on the environment are likely.
In Ireland, these EU requirements are transposed into the domestic planning system principally through the Planning and Development Act and the Planning and Development Regulations. The Regulations therefore provide the framework within which planning authorities and An Coimisiún Pleanála determine whether a proposed development falls within an EIA category and, where relevant, whether it is likely to have significant effects on the environment.
For Annex II projects below the relevant thresholds, the Irish regulations provide for consideration of whether the project is likely to have significant effects on the environment. In making a formal screening determination, the decision-maker must have regard to the selection criteria set out in Annex III of the EIA Directive (Schedule 7 of the Planning and Development Regulations).
The difficulty identified by the High Court in Shorten v An Coimisiún Pleanála IEHC 517 is whether Ireland’s existing “preliminary examination” mechanism provides a legally sufficient means of reaching the conclusion that formal EIA screening is not required.
The EIA Directive does not expressly provide for a separate “preliminary examination” stage. The question referred to the Court of Justice of the European Union (CJEU) is therefore, in essence, whether the Irish approach is compatible with the Directive’s requirements, including the obligation to determine whether an Annex II project is likely to have significant effects by reference to the relevant selection criteria.
This distinction is important in practice. A preliminary examination may conclude that it is clear that a project is not likely to have significant environmental effects, whereas a formal screening determination requires the competent authority to undertake the assessment by reference to the prescribed criteria in Schedule 7. The High Court’s referral therefore raises a fundamental question about whether the former can properly be relied upon instead of the latter.
Why does this matter now?
The practical implications are already being felt. We are seeing increased scrutiny of EIA requirements on planning applications currently progressing through the system, including requests for formal EIA Screening Reports and associated information in circumstances where a preliminary assessment may previously have been considered sufficient.
For applicants and project teams, this creates an important practical consideration: an approach that may previously have been considered proportionate and sufficient may no longer provide the same level of certainty. Waiting for the CJEU to resolve the underlying legal question could take considerable time. In the meantime, applicants need to consider how best to manage the planning and environmental risk associated with their projects.
What should project teams consider?
For projects currently in development or preparing for planning submission, it is worth reviewing the EIA position at an early stage. Where there is any uncertainty around whether a project requires EIA screening, project teams should consider whether it is more appropriate to prepare the information required for formal screening, rather than relying solely on a preliminary examination. .
This is particularly relevant where a project is close to submission, where the planning programme is critical, or where additional requests for information could have implications for programme and cost
The key point is not that every project now requires an EIA Screening Report. Rather, the threshold for deciding that formal screening is unnecessary has become a much more important issue to consider and document carefully.
What does this mean for developers and consultants?
The situation reinforces the value of bringing environmental expertise into a project early. A robust environmental strategy should not simply ask whether an EIA is ultimately required. It should consider the appropriate screening route, the information needed to support the decision, the potential planning programme implications and how environmental issues can be addressed before they become a source of delay.
At ORS, our Environmental Services team works with developers, design teams and planning consultants from the earliest stages of project development. Our experienced specialists can advise on EIA screening requirements, prepare screening documentation and help project teams navigate the evolving regulatory and planning environment.
Our approach is deliberately practical: identify the risk early, understand what information is required, and provide the environmental input needed to keep projects moving.
A changing planning environment
The Shorten decision is particularly timely given the wider changes taking place within Ireland’s planning and development framework. The Planning and Development Act 2024 and associated regulations are expected to bring further changes to how environmental assessment and screening operate. For project teams, the lesson is straightforward: environmental assessment is becoming an increasingly important part of programme management, not simply a planning compliance exercise. The legal position will ultimately depend on the outcome of the CJEU process and any subsequent changes to Irish legislation or guidance. Until then, developers and their professional advisers should consider carefully whether their projects are adequately protected against the risks associated with EIA screening.
If you have a project currently in the planning pipeline and would like to discuss the implications of the Shorten decision, our Environmental Services team would be happy to advise. Email us at info@ors.ie or call +353 1524 2060.