Thank you Rupert but I've done months of research on visas etc - perhaps that is why I'm in a muddle, with all the various options and subsequent restrictions!
I know I'm not entitled to a 189. We can't apply for a 190 for Perth as my skills aren't in demand in WA and the same applies to a 187. I'm therefore only entitled to a 186 or a 457 if we want to live and work in Perth, and for that I need an employer sponsor. I have applied for a skills assessment because we know my occupation has a code on the list which means I'll probably have to be the visa holder. The whole point of my initial query was to try and find an appropriate code for my husband for the reasons I gave earlier, I.e. we would have preferred him to be the visa holder. I don't mind working but would have preferred part time for the childrens' sake.
Generally speaking, I'm trying to establish whether the ANZSCO code for Building Associate (which gives a generic description) would be suitable seeing as my husband does all the specified tasks and responsibilities but SPECIFICALLY for Scaffolding in a supervisory role. So I'm not looking for a scaffolding code because he's no longer on the tools. There are many elements to 'construction/building' - scaffolding being one part of the jigsaw. In essence, it falls under the same remit as Building Associate but not in its entirety. That is why I'm unsure if it is a highly relevant enough field!
I apologise if I've confused or frustrated you - just looking for some clarity among the muddy waters!!