This Act amends Title 16, Chapter 76 of the Delaware Code relating to energy conservation identified in county and municipal building and plumbing codes. Consistent with codes in other States, including New York, Rhode Island, and Washington, among others, this Act requires as a threshold that counties and municipalities must, at minimum, meet the threshold adopted by the Delaware Energy Office (“DEO”). The Act authorizes counties and municipalities to go above the threshold adopted by the DEO. This Act also amends Title 29, Chapter 80 of the Delaware Code by charging the Energy Efficiency Advisory Council and the Sustainable Energy Utility to collaborate to design programs to promote and support the development and construction of energy efficient housing, including programs to alleviate the potential increased upfront costs caused by the adoption of local stretch codes.