Isn’t body corp still available after the warranty period? If all fails, doesn’t it eventually land with body corp?
Yes, but if it’s a building defect, the builder/developer should fix it in the first six years. Okay, the owners corp carries the can thereafter, but that means you are paying ashare of all the repairs (and all the others that are found in other apartments).
You might be able to get the builder to fix defects after the developer warranty period expires, but it’s a lot harder.
Also, new buildings should have a defects bond that can be accessed to pay for defects. if you don’t make a claim, the developer pockets the money.
Get professional advice or you and your neighbours will be taken for mugs.