Photo: International Code Council

Building codes establish the minimum legal requirements for buildings. There are typically two types—prescriptive and performance.

Prescriptive codes tell a designer what must be done (such as requiring R-20 insulation in the walls). Performance codes simply provide a metric that must be met (such as total energy use relative to a baseline), allowing the project to meet that benchmark in a variety of ways.

Code requirements differ from locale to locale, so here we cover news related to sustainability or energy use in building codes, and ways in which innovative green technologies are limited by code requirements.


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  • Graywater Collection and Use


    If properly stored and separated from potable water, graywater collected from sinks, showers, and clothes washers can be used to irrigate landscaping.

Product Guidance

Unbiased information from our product experts helps you separate green from greenwash.

In The News

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Thought-provoking opinions from the most trusted minds in sustainability.

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