Often, the distinctions between different formats are not clear, and one tool may incorporate two or more formats. NABERS-Home is anexample of a tool that functions both as a rating tool and an assessment. It uses post-occupancy monitoring to calculate the energy and water use - and associated environmental impacts - of an existing home, and then rates the home’s performance compared to similar homes June 16, 2009—Page22from a national database. All three formats are also evolving for use as official sustainable building standards and improved building codes. The U.K.’s Code for Sustainable Homes is an example of a voluntary rating tool that will transition into mandatory national building code by 2016. In fact,many local governments are beginning to adopt these tools for use. For example, the city of Portland is now requiring publicly-funded buildings to meet LEED silver, and Boston is requiring LEED silver for all commercial buildings in the city. Several sustainable building organizations, such as the Green Building Initiative’s Green Globes program and the U.S. Green Building Council are now developing official ANSI and ASHRAE standards for non-residential green buildings. TheNational Association of Home Builders (NAHB) is also developing an ANSI standardfor residential projects. Green building standards will be easy to adopt into a variety of building codes.
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