Workcover is responsible for workplace safety, which applies to pretty much all building sites. That has nothing to do with approving actual work/construction.
I suggest the fastest way of finding out what is required is to ring your local council – they are very helpful on things like that. I know nothing about lifts etc. but on its face there is a huge difference between a dumb waiter and a lift that carries people.
If they need to modify common property then they need your approval.
Note there are also clear council requirements re noise, for example re air conditioners or generators near habitable spaces.
You need to see very detailed plans and specifications and I believe so would the council.