In May 2009, the state issued an Appendix to the IECC. The Appendix is an optional "stretch" energy code that can be adopted by municipalities to set a more stringent efficiency standard for new construction and major renovations. The "stretch code" is 20% more stringent than the state's base building code energy requirements, those effective in 2010.
Cities and towns in Massachusetts that are pursuing a Green Communities designation through DOER are required to minimize the life-cycle costs for all new residential buildings over 3,000 sq. feet and all new commercial and industrial buildings. By adopting the stretch code, cities and towns can meet this requirement.
This information is provided by the Department of Energy Resources.