I think it is starting to happen. In Victoria all new homes now have to comply with the 5 star energy rating: 5 Star energy rating for building fabric and wat

I think it is starting to happen. In Victoria all new homes now have to comply with the 5 star energy rating: 5 Star energy rating for building fabric and water saving measures including water saving tapware, flow reducing showerheads and water pressure reduction to 500kPa at outlets within the home, plus Either a rainwater tank for toilet flushing or an approved solar hot water service And from 1 May 2008, the standard has covered renovations (dropping the requirement for solar HWS or rain water tanks).