Geoff Hanmer . Articles Beyond Opal: a 10-point plan to fix the residential building industry So far, the only reaction from government has been a knee-jerk promise to crack down on shonky building certifiers. Unfortunately, there is no evidence this will make any difference. Lessons from the cracks in Sydney's Opal Tower extend beyond certification Many commentators are jumping to the conclusion that the problems with Opal Tower are the result of the privatisation of building certification.