A London plumber told me once he spends a lot of time in super poorly made new builds. Construction firms build them super shitty but with a five/ten year guarantee, take the money, then declare themselves bankrupt. The guarantee is worthless because the firm is gone, they make a ton of cash on the build, they set up again and rinse and repeat. I assume it's a little more complicated than that, but he said he'd seen it a lot and spends a lot of time fixing problems he shouldn't. Is this similar in Sydney?