R v Hegarty; Ex parte City of Salisbury

The applicant, the City of Salisbury, sought a writ of mandamus from the High Court of Australia directed to the respondent, Mr. Hegarty, a member of the South Australian Planning Appeal Board. The dispute concerned the Board's refusal to grant consent for the construction of a motel and restaurant, a decision the City of Salisbury contended was made without proper regard to the relevant planning regulations and without affording the applicant natural justice.

The High Court was required to determine whether the Planning Appeal Board had acted in excess of its jurisdiction or had failed to observe the principles of natural justice in its determination of the development application. Specifically, the Court considered whether the Board had properly interpreted and applied the provisions of the relevant planning legislation and whether the applicant had been given a sufficient opportunity to present its case and objections.

The Court held that the Planning Appeal Board had indeed acted in excess of its powers and had failed to afford the applicant natural justice. The majority reasoned that the Board had misinterpreted the statutory requirements for granting consent, effectively imposing conditions that were not authorised by the legislation. Furthermore, the Court found that the Board had not provided the applicant with adequate notice or opportunity to be heard on crucial aspects of the decision-making process, thereby breaching the rules of natural justice.

Consequently, the High Court made absolute the order nisi for a writ of mandamus, quashing the decision of the Planning Appeal Board and remitting the matter for reconsideration according to law.