Does the building code require double-pane low-E windows?
Even though they cost more than single-pane windows, double pane low-E windows will decrease your energy usage while enhancing the comfort of your home. You’ll need to contact the permitting jurisdiction in the area (either the city or the county) to find out if double-pane low-E windows are required. They may be required for builders participating in the EPA’s ENERGY STAR program to certify their homes.