At the risk of upsetting the apple cart, there are some good ideas here but I do believe the core issue is completely missed.
The code of practice says that you are suppose to have a management plan and renovation survey when doing renovations. The management plan needs to be kept on site. In my experience it is rare for a builder or trades to do this. Even if they know it is a requirement. Often they say my competitors don't why should I add on extra costs. — Stuart Keer-Keer
Your last sentence comes close to my view. Let me explain.
My opinion is that it is more to do with business costs and the ability to secure work more than any denial, lack of education, ACOP requirements and such like.
Small businesses in NZ (those that employ less than 20 people) makes up 97% of the total business in NZ (MBIE and StatsNZ), employ nearly 30% of the workforce (MBIE and StatsNZ) and generate just over 25% of GDP (MBIE and StatsNZ). Interestingly enough, these SMEs employ and average of one and a half people per business.
The annual surplus for SMEs after deducting average wages/salary but before taxes and expenses is about $42k per person or around $64k per business. Not a lot.
Comparatively, large businesses that employ more than 20 people have bigger annual surpluses. About $88k per employee and $10.4 mill per business.
That SMEs average 1.5 employees per business tends to indicate (for me) a lot of sole traders or two/three person bands whereas larger businesses average 119 employees each. And every employee usually has at least a couple of mouths to feed at home.
So IMHO, given there are so many small businesses (546,000 according to MBIE and StatsNZ), the competition for work is high therefore quotes need to be competitive (you could say cheap is the word). Shortcuts are normally taken to secure work.
The NZ construction industry framework has changed over the last 30-40 years with the advert of companies specialising in project management. This has created another level in how work is organised. Project managers take an initial cut of the cost. What's left is passed to the main contractor who take their margin, followed by lesser contractors to finally down to the SMEs and there is usually not much left in the pot.
The charge-out rate for an SME has to be similar or cheaper than their competitors otherwise a business will miss out on the work. And no work can mean no money which can lead to hungry mouths. Shortcuts get taken.
IMHO I don't believe SMEs are denying there is an issue with asbestos (or silica or asthma or noise or HAV) but are practically applying what they see as limits on what they need to quote for so they can secure work. These businesses may also be aware of the not insignificant costs involved with compliance.
So from my point of view, the main market H&S is aiming for is the biggest one numerically but the smallest one financially. Maybe it is time to work out how to entice the larger organisations to engage in ethical and moral obligations by investing in their SMEs.
Just my 2 cents worth.