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The Massachusetts Stretch Energy Code was adopted by the Town of Nantucket, effective as of September 1, 2019. All New Residential Dwellings and Large Commercial project applications will need to comply with the adopted code.
In 2009, Massachusetts became the first state to adopt an above-code appendix to the “base” building energy code,
called the “Stretch Code” (780 CMR Appendix 115.AA). The purpose of the Stretch Code is to provide a more
energy-efficient code alternative for new buildings.
The Stretch Code is performance based as opposed to prescriptive, and applies to all residential-use buildings, of
four stories or less, and all commercial building over 100,000 square feet.
Note: All additions, renovations, and repairs to residential buildings are explicitly exempt from the Stretch
Code. Also, smaller, new commercial buildings as well as additions, renovations and repairs of commercial
buildings are exempt.
New homes/apartments must meet a HERS (Home Energy Rating System) index rating target, based on the total
building envelope and mechanical efficiencies. Under the Stretch Code, builders have the flexibility to choose how
to design the home to meet the HERS rating target, which is calculated by a certified HERS Rater using specialized
and accredited software.