Aside from the Building Commissioner of Western Australia which offers a cost effective, timely resolution process you can also hire a legal professional to deal with your building complaint under Consumer law - which is primary dealt with at small claims court.
Consumer Law states that:
A supplier (builder, tradesman, tiler, painter) must meet the consumer guarantees of providing services:
> with due care and skill
> which are fit for any specified purpose
> within a reasonable time (when no time is set).
Failure to do so contravenes Consumer Law and your SHS Expert Witness Report may assist you with a successful determination at court should you decide that this is the path you would like to take regarding your building complaint