A further analysis on the other credit requirements indicate that Asian case studies outperform the US case studies by conforming with the requirement for day lighting and views which are key approaches in passive design which should be reflected in energy efficiency performance. However the data referring to overall energy performance in Asia case study group did not confirm this contention. We cite CEU [3], Huang & Deringer [4] and Evans et al. [5] to suggest that low performance in energy efficiency in Asia may be due to variations in energy codes and their lack of legislation across Asia.