Adelaide City Council v Sarris

The Adelaide City Council (ACC) appealed a decision of the Environment, Resources and Development Court of South Australia (ERD Court) concerning the calculation of building floor area for a residential development. The dispute centred on whether the floor area of a balcony, enclosed by glass panels, should be included in the calculation of the plot ratio, a measure of development density. The ACC argued that the balcony's floor area should be counted, while the respondent, Mrs Sarris, contended it should not.

The central legal issue before the Full Court of the Supreme Court of South Australia was the interpretation of the term "outer walls" as defined in the ACC Development Plan. Specifically, the court had to determine whether glass panels enclosing a balcony constituted an "outer wall" for the purpose of calculating "building floor area" under the Development Plan's definitions. This interpretation was crucial for determining compliance with the plot ratio requirement of 0.8 for the relevant policy area.

The Full Court reasoned that the ERD Court had erred in law by adopting a meaning of "outer walls" that extended beyond its ordinary meaning. The court emphasised that Development Plan terms should be interpreted according to their ordinary meaning to ensure clarity and predictability for those relying on them. It found that the glass panels, which allowed the balcony area to be affected by the elements, did not qualify as "outer walls" in the conventional sense. The court also considered that a broader interpretation would negatively impact the availability of usable outdoor space and potentially undermine privacy provisions within the Development Plan.

Consequently, the Full Court allowed the appeal, setting aside the ERD Court's order. It ordered that Mrs Sarris's appeal to the ERD Court be dismissed, meaning the ACC's original categorisation stood. The court indicated it would hear the parties on the issue of costs for both the ERD Court appeal and the Supreme Court appeal.