You just can’t make a career out of construction with the current boom and bust way the cycle is going.
The challenge is health. It's a very demanding line of work where you have to carry weight, wake up in the early morning and work in the cold. People don't want to work like that. It's very hard on the body and you're broken when you reach your 50's.
When you are in your 20's. You fall from a ladder, break some bones, you heal and get back on your feet one year later. When you are in your 50's, you are more fragile and less resilient, same thing happens, you might never be able to work again. It's brutal.
There are huge markups in the local market on building materials due to a duopoly. It is cheaper to fly to Australia buy NZ made siding there and ship it to NZ than to buy it locally.