Are dark roofs banned in NSW?

It is not banned but admittedly harder to achieve higher BASIX standards (2022 onwards). If you are using a DIY method of compliance, dark roofs are banned in several areas in NSW, like Greater Sydney. However, if you are using simulation instead of the DIY method, then you can have dark roofs anywhere in NSW, but you will have to compensate for the increased cooling demand elsewhere (e.g. by installing tinted windows or shading devices).