The Building Codes Assistance Project - an initiative from the National Resources Defense Council, the Alliance to Save Energy, and the American Council for an Energy-Efficient Economy - recently released some fact sheets on just that issue.
While they were looking at the costs of building a home to 2009 IECC standards rather than ENERGY STAR, the same principle applies. A certain amount (depending on the state) is added to the cost of the home to bring it up to more efficient standards, and savings on utility bills are also estimated.
The skinny of it for 28 different states can be found here -
http://bcap-ocean.org/incremental-cost-analysis
A more detailed fact sheet for North Carolina is also available -
http://bcap-ocean.org/sites/default/files/resources/Incremental_Cost_North_Carolina.pdf
The break-even point - when your savings are greater than expenses - is only 8 months. Every year, the homeowner is saving an average of $221. And as electricity prices rise, the savings will too.
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