Owners - Strata Plan No 13218 v Woollahra Municipal Council

In *Owners - Strata Plan No 13218 v Woollahra Municipal Council*, the owners of a strata plan appealed to the High Court of Australia against a decision concerning damage to a retaining wall. The dispute centred on whether the Woollahra Municipal Council was liable for the failure of the retaining wall, which the owners alleged was caused by the pressure exerted by the roots of a tree growing on a footpath under the Council's control. The owners' claims included nuisance and negligence, asserting that the Council had failed to prevent the tree's roots from causing damage to the wall.

The High Court was required to determine whether the Council owed a duty of care to the owners to prevent damage caused by the tree's roots, and if so, whether that duty had been breached. Specifically, the Court had to consider the application of the highway immunity rule and the principles of non-feasance in relation to public authorities. The Court also needed to assess the evidence regarding the cause of the wall's distress, including expert opinions on the influence of the tree roots versus alleged inadequate design and construction of the wall.

The majority of the High Court found the Council liable. The Court accepted the evidence that the tree's roots were indeed causing pressure on the retaining wall, leading to its failure. The Court reasoned that the Council, by its control over the footpath and the tree, had a duty to take reasonable steps to prevent foreseeable damage to adjoining properties. The Court found that the Council's defence based on highway immunity and non-feasance was not applicable in these circumstances, particularly given the active nature of the damage caused by the tree's roots. The appeal was allowed, the finding of liability was upheld, and the matter was remitted to the Equity Division to assess damages. The respondent Council was ordered to pay the costs of the trial and the appeal.