Mazzarol v Shire of Gnowangerup

The High Court of Australia considered an appeal by Mazzarol against a decision of the Supreme Court of Western Australia concerning the validity of a notice issued by the Shire of Gnowangerup. The dispute centred on whether the Shire had lawfully exercised its power under section 317 of the *Local Government Act 1960* (WA) to require the removal of certain structures on Mazzarol's land.

The central legal issue before the High Court was whether the notice issued by the Shire was a valid exercise of its statutory power. Specifically, the court had to determine if the Shire had acted within the scope of its authority under section 317 of the *Local Government Act 1960* (WA) when it demanded the removal of Mazzarol's structures, and whether the notice itself met the requirements of the Act.

The High Court found that the Shire's notice was invalid. The court reasoned that section 317 of the *Local Government Act 1960* (WA) conferred power on a local authority to require the removal of structures that were "unlawful" or "objectionable." However, the structures in question were found to be lawful and not objectionable in the sense contemplated by the Act. The Shire had failed to demonstrate that the structures contravened any specific provision of the Act or any by-laws, nor had it established that they constituted a nuisance or were otherwise objectionable in a manner that would justify the exercise of its power under section 317. The court applied the principle that statutory powers must be exercised strictly within their defined limits and for the purposes for which they were granted.

The High Court allowed the appeal and ordered that the notice issued by the Shire of Gnowangerup be quashed.