Performance Standards: National Green Building Standardâ„¢

The National Green Building Standard provides recognition for sustainable and energy-saving building practices, including the use of energy-efficient windows, in all types of residential construction. This standard has been developed for by a consensus committee assembled by the National Association of Home Builders (NAHB) and the International Code Council (ICC).

Windows in the National Green Building Standard

The table below lists the mandatory and optional performance specifications for windows in the prescriptive path of the standard. Up to 13 points can be gained through the use of high-performance windows. For comparison, 30 points are needed in the energy-efficiency category for a home to qualify for the lowest (Bronze) recognition of the standard. The mandatory performance minimum must be fulfilled even if the performance path of the standard is chosen instead of the prescriptive path.

Source: ICC 700-2015 National Green Building Standard

Window energy performance is also supported by credits for sun-tempered or passive solar design, which includes orientation-specific glazing selection, shading, and related design considerations.

For more information about the National Green Building Standard, see information from the Home Innovation Research Labs

The National Green Building Standard Certification provides third-party proof for product performance claims.

The Green Scoring Tool allows the scoring of a project to the Standard and includes support materials such as how to verify, intent, how to implement, resources, and green approved products.

About Us

provides unbiased information and education to the public on the energy efficiency, technical, and human considerations that influence window selection and use. The EWC collaborates with allied organizations, educational institutions, and government agencies that promote energy efficiency in residential windows. We do not sell, service, install, or recommend products, or endorse manufacturers. Descriptions and specifications of the products in the Window Selection Tool are provided by the manufacturer. The EWC is not liable for any manufacturing defects or inaccurate product descriptions and specifications and does not guarantee the performance of NFRC-certified windows, doors, and skylights.

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