The New Buildings Institute Model Stretch codes present jurisdictions with a set of energy-saving building strategies that cover building components such as envelope, mechanical, water heating, lighting and plug loads. This work provides cities and states the basis for maximizing energy savings in both commercial and residential projects over the course of several code development cycles, allowing the market to prepare and gain experience with new efficiency practices and technologies. The codes offer 20% and 40% performance improvement over IECC 2015 and ASHRAE 90.1-2013.