Stretch Energy Code

On December 21, 2009, the Cambridge City Council voted to adopt the Stretch Energy Code. The higher standards for energy efficiency in building projects went into effect on July 1, 2010. Cambridge was one of the first municipalities in the state to adopt the Stretch Energy Code.

The Stretch Energy Code is an Appendix 115 AA to the State Building Code and was created by the Massachusetts Board of Building Regulations and Standards (BBRS) in 2008.  The Stretch Code provides an option for cities and towns to adopt an energy code that requires greater energy efficiency in buildings than the base code that is otherwise mandatory for municipalities across the state.


General Information

Adoption of the Stretch Code by Cambridge

Stretch Code, Appendix 115 AA

BBRS Summary of Stretch Energy Code Appendix 

Summary Table Stretch Energy Code Appendix 

Board of Building Regulations and Standards   

Residential Buildings

Overview of HERS Rating System 

Residential Buildings Frequently Asked Questions 

Summary of Residential Stretch Energy Code 

Memorandum on Energy Modeling of Cambridge Triple Decker 

Commercial Buildings 

Overview of the Stretch Energy Code and Commercial Buildings by Ian Finlayson, Executive Office of Energy and Environmental Affairs 

Overview of Energy Modeling 

Commercial Buildings Frequently Asked Questions 

Fidelity Case Study 

Warwick Home Loan Investment Bank Case Study   

For More Information

For more information about the Stretch Energy Code, please contact John Bolduc, Environmental Planner, at 617/349-4628 or