Residential homes, including both single-family and multi-family, must exceed the 2006 IECC energy efficiency standards by a percentage that is based on square footage. Single-family homes less than 3,000 square feet must be 30% more efficient; homes between 3,000 and 5,000 square feet must be 50% more efficient; and homes larger than 5000 square feet must be 75% more efficient. All multi-family homes must exceed the 2006 IECC by 30%. All applicants seeking a remodel or addition to an existing structure must complete an energy audit before a permit to build will be issued. New construction and remodels must also show that at least 50% of the construction waste is recycled.