BASIX and NatHERS for Class 2 Buildings: A 2026 Compliance Checklist for NSW Apartment Developers For apartment developers in New South Wales, the BASIX certificate is not a formality — it is a design constraint that shapes orientation, glazing, servicing, and budget from the earliest sketch desig... BASIX apartment-design basix-certification basix-compliance class-2-building design-practitioner multi-residential nathers nathers-certificate nsw-building-compliance Aug 7, 2026