One of the most persistent challenges faced by both planning practitioners and decision-makers is determining how planning policy should be approached and applied in practice. The difficulty lies not only in the complexity of individual policies but also in drawing the proper line between legal interpretation and planning discretion.
The proper starting point is textual. Planning policies, like statutory instruments, must be interpreted according to their wording. This textualist, or positivist, approach secures legal certainty by anchoring interpretation in the language used. Where the policy language is categorical—such as the use of “shall not”—its meaning must be applied strictly unless an explicit exception is built into the text. Any attempt to dilute such exclusions through discretion or context would undermine the normative force of the policy and the predictability of its application.
As a next step, where policies appear to conflict, the resolution lies in legal hierarchy, not in compromise. For instance, Article 52 of the Development Planning Act provides a statutory ordering mechanism: a mandatory rule found in a Local Plan will prevail over a more flexible design principle of lower authority. This hierarchy ensures internal coherence within the planning framework and guards against the discretionary prioritisation of softer policy aims over binding planning controls.
Despite these structural features, policy documents frequently make use of open-textured language—terms such as context, character, or commitment. These are practical, and sometimes necessary, tools for flexible application in diverse planning environments. However, their vagueness can obscure legal meaning. It is therefore essential to distinguish between questions of law and questions of planning judgment.
Yet, because planning policies are legal instruments, they are subject to judicial interpretation. In other words, courts cannot be excluded from construing the meaning of policy terms, particularly where such terms affect the rights, expectations, or obligations of applicants and the public. In the event of a dispute, it is the role of the judiciary to determine the legal meaning of these terms, read objectively in their proper context. This includes consideration of the policy’s text, its placement within the planning hierarchy, and its alignment with the statutory purpose.
However, once a policy term has been defined by the courts, the task of applying that definition to a given set of facts falls to the planning authority or relevant tribunal. The court does not engage in assessing whether those facts meet the defined standard. That function is allocated to the competent administrative body, whether the Planning Authority Board or the Environment and Planning Review Tribunal. Their task is to determine, on the evidence presented, whether the threshold established by the defined term is met.
The application of this structure is best illustrated by referring to Article 72(2) of Chapter 552. That provision requires the Planning Board, in determining development applications, to “have regard to” a range of considerations, including policies, regulations, legal commitments, and other relevant matters. This phrase entrusts the Planning Authority Board as well as the Environment and Planning Review Tribunal with a broad evaluative mandate.
That said, the question of what “commitment” legally entails is one of interpretation because, at face value, it may refer to a binding obligation, a settled intention by the state, or a visible and consistent pattern of development. This threshold question is for the courts to resolve. But whether two existing buildings meet that standard in a specific case is a matter of planning judgment, falling within the competence of the Planning Board or Tribunal. In other words, provided that the decision-maker has applied the law correctly and relied on relevant and sufficient evidence, it is not for the court to substitute its own view.
To clarify this distinction further, one may articulate the following structured approach:
- Legal interpretation: Where a dispute arises concerning the meaning of a policy term—particularly one that is open-textured, ambiguous, or carries legal implications—the matter falls within the jurisdiction of the court. The judicial task is to fix the meaning of such terms in accordance with statutory purpose and legal principle.
- Application to facts: Once the legal meaning of a term has been established, its application to the specific facts of a development application is for the planning authority or tribunal. This is an evaluative exercise, which may involve discretion and professional judgment, provided it is exercised reasonably.
