Coastace Pty Ltd v New South Wales

Coastace Pty Ltd (Coastace) sought judicial review of a decision by the New South Wales Minister for Planning (the Minister) to refuse consent for the development of a residential estate and associated infrastructure on land at Port Stephens. The dispute concerned the validity of the Minister's decision, which Coastace alleged was vitiated by an error of law, specifically a failure to take into account relevant considerations and the taking into account of irrelevant considerations. The matter was heard by the High Court of Australia.

The High Court was required to determine whether the Minister, in refusing development consent, had failed to consider a mandatory relevant consideration, namely the environmental impact statement (EIS) prepared by Coastace, and whether the Minister had taken into account irrelevant considerations, specifically the potential for the development to exacerbate existing traffic congestion and the impact on local infrastructure. The central legal issue was whether the Minister's decision-making process had been so flawed as to render the refusal unlawful.

The Court reasoned that the Minister was bound to consider the EIS as it was a statutory requirement under the relevant planning legislation. The Court found that the Minister had, in fact, considered the EIS, but had given it less weight than Coastace might have preferred. Regarding the alleged irrelevant considerations, the Court held that the Minister was entitled to consider the potential impact of the development on traffic and local infrastructure, as these were legitimate planning considerations relevant to the public interest. The Court applied the principles of administrative law concerning the duty to consider relevant matters and the prohibition against considering irrelevant matters, finding that the Minister's decision, while perhaps debatable in its merits, was not legally flawed.

The High Court dismissed Coastace's application for judicial review.