This factsheet from WA’s Environmental Protection Agency is so technically detailed, it is almost meaningless. However, it does say that you can call the local council during office hours and police at other times to deal with noise. Either can issue a Noise Abatement Direction which, if not complied with, can lead to the seizure of sound equipment and fines. The paragraphs below are extracts from the factsheet.
As in most other states, Owners Corps can’t issue fines directly but they can take residents to SAT to have fines imposed. However, it’s worth noting that this factsheet from SAT says they can impose “a fine for a breach of a by-law if the by-law specifies a fine for its breach.” That seems to imply that your by-laws have to have a fine for excessive noise specified – so maybe you do need a new by-law after all.
FYI, strata Law in WA is undergoing a major rewrite which will result in all disputes being heard at the State Administrative Tribunal.
Noise Abatement Direction
Where an authorised person or police officer believes that an unreasonable noise is being emitted from any premises he or she can issue a noise abatement direction to the occupier of the premises (and anybody making or contributing to the noise) to stop the noisy activity. Failure to comply with a noise abatement direction is an offence. Failure to comply with a direction also entitles the authorised person or police officer to seize the equipment that is causing the noise. To assist in the exercise of these powers, authorised persons are entitled to enter any property and demand of any person the name and address of the occupier of the premises.
Prosecution
Where an offence is committed against the Act, a prosecution may be commenced by the CEO of DEC, or for lesser offences, by an authorised person. Unreasonable noise caused by equipment (see above) may also be challenged through a private prosecution. Usually this requires three occupiers of premises directly affected by the noise to commence proceedings together. Less than three people may start an action where less than three occupiers were affected, the other occupiers are unwilling to participate in the action or the person who is bringing the action was affected to a significantly greater degree than were other occupiers. If a prosecution is successful, the EP Act authorises the court to make a range of orders beyond merely awarding damages. The court may order the forfeiture of any equipment used in the offence, and can also make orders to prevent recurrence of the offence.