Building granny flats in Australian homes creates affordable, independent living spaces for family, guests, or rentals, boosting property value by up to 30% and generating steady income streams. Versatile designs transform backyards into home offices, studios, or multi-generational havens, maintaining privacy while fostering closeness in coastal or suburban settings. Quick construction minimizes disruption, complies with regulations, and enhances overall usability for sustainable, cost-effective expansions.