After all this consideration of finances, it is nice to find some things that are free. If you are thinking about knocking down your old home and replacing it with a sustainable, energy-efficient one, first take a look at yourhome.gov.au. The site has plenty of advice and ideas for passive design, materials, energy-efficiency, as well as case studies for different climates.
Even better, it offers free designs for energy-efficient homes that can be used as-is or customised to suit your needs. The designs have been created by an architect in collaboration with an energy assessor to create sustainable homes with well-planned, comfortable and practical spaces. Image: Acacia House, yourhome.gov.au