Earlier quoted context omitted.
You pass a law giving a class of inspector the right to enter premises where building works appear to be progressing. You strictly limit what they are permitted to observe and record and require recording of reasonable suspicion. Refusal to grant entry is itself an offence. Approaches like this would work but are also a huge can of worms.
>You pass a law giving a class of inspector the right to enter premises In most countries (and I'd expect to include Australia), there cannot be a blanket invasion of privacy - and it'd require a court order. The amount of paper would would be ridiculous, then what if I do that on my own, or I used a cousin to do it for me, for free?
Seriously, who in their right mind is going to deny entry to an auditor making sure that your builder isn't an idiot?