NSW Shoalhaven Granny Flat - Secondary Dwelling

Are there any Shoalhaven specific laws to attached Granny flats? We are extending an existing house and looking to attach a granny flat to the end of the garage. This is all going through DA so granny flat approved all in one (not CDC).
Someone told me there needed to be a door between the primary dwelling and secondary dwelling but I cant find any info on that.
Ive attached a plan for reference. Basically private side access from the street to a self contained studio style granny flat with private alfresco area and fire rated wall between it and the primary dwelling.
Any info would be really appreaciated!
Cheers

 

I still don't know why you would not try for CDC with this? You would not normally have a door between dwellings for a true GF or 2ndary dwelling as they need to be fire separated. If you are doing a DA at council a local consultant is your best bet.