I know this sounds like a noob question, but really I just do most stuff myself and it's not immediately obvious who I'd call for such a job beyond a "builder".
I'm in Melbourne if anyone has a specific recommendation, but just the type of company that could do it all without calling a plasterer, a joiner, and a door bloke, or is that just how it's done?
Any advice appreciated.
Speak to your selected wardrobe company. They are sure to know who to contact for the removal of the old wardrobe. After all, they can't sell you a new wardrobe unless you can get rid of the old one.