In Australia, building energy standards are lower than in many parts of Europe, and it is relatively difficult to source some high quality components here. The extra cost will depend greatly upon design, size of project, quality of finishes and so forth, but typically a range of 10 – 20% should be prepared, assuming the builder has some experience and training in this type of construction. However, recent local social housing projects are suggesting very small additional costs. The more large-scale window and door manufacturers bring high-performance products to the Australian market, economies of scale will drive down costs. The cost is usually offset by the massive reduction in energy bills, and the elimination of heavy mechanical heating and cooling units. With increasing energy prices, the question to ask yourself is ‘Can I afford not to build a Passive House’!