3m protected tree setback CDC tree protection measures

CDC in NSW allows building envelope up to 3m of protected trees. What happens when said protected tree has a larger tree protection zone radius of, say, 10m. If the building significantly encroaches into the tree protection zone up to the 3m cdc setback limit (that is a 7m TPZ encroachment or approximately by 30% or so), what does the CDC require in terms of tree protection? Is this part of the CDC certification check, or some other stage? Do the builders need to do anything specific when building in the TPZ under a CDC, or not (i.e. can they just cut the roots and put in the concrete slab).