Pergolas and boardwalks would seem to fall into Class 10a, non-habitable buildings or structures, more info here: https://puddingln.com.au/resource/building-classification. However, we urge you to seek an opinion from a local authority or building surveyor since we are not experts when it comes to interpretation of the National Construction Code.National Construction Code
Answered on 18-11-2020
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.