Take the owner to NCAT under section 132. NCAT can then order the structure to be removed, but the astute owner would accede to the OC and be more compliant.
Yes. Section 132 relates to orders where an owner has done work that has damaged common property.
Explain what happens if they don’t cooperate as well as the probability that they will have costs awarded against them if they are obstructive (as has just happened in the case about Acacia Gardens).