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Incentives/Policies for Renewables & Efficiency

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Building Energy Code   

Last DSIRE Review: 07/24/2013
Program Overview:
State: Delaware
Incentive Type: Building Energy Code
Eligible Efficiency Technologies: Comprehensive Measures/Whole Building
Applicable Sectors: Commercial, Residential
Residential Code:2012 IECC, mandatory statewide; may use REScheck or ENERGY STAR documentation software to show compliance
Commercial Code:ASHRAE Standard 90.1-2010, mandatory statewide; may use COMcheck to show compliance
Code Change Cycle:Every three years
Jurisdictions:Mandatory statewide
Web Site:
Authority 1:
Date Effective:
16 Del. C. ยง 7602)
July 1, 2010

NOTE: Much of the information presented in this summary is drawn from the U.S. Department of Energy’s (DOE) Building Energy Codes Program and the Building Codes Assistance Project (BCAP). For more detailed information about building energy codes, visit the DOE and BCAP websites.

Delaware Energy Code is reviewed by Delaware Energy Office every three years for potential updates to the most recent version of International Energy Conservation Code (IECC) and ASHRAE Standard 90.1.

Starting May 11, 2014 Delaware updated its energy code to 2012 IECC and ASHRAE 90.1-2010 with minor amendments. The code will be effective on Nov 11, 2014, after six months of grace period.


In 2004, the governor signed SB 306 adopting the 2000 International Energy Conservation Code (IECC) for residential construction and American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) Standard 90.1-1999 for commercial construction.  SB 59, signed in July of 2009, strengthened Delaware's building code, requiring 2009 IECC for new detached one- and two-story family dwellings and all other new residential buildings three stories or less constructed after July 1, 2010. All other new construction built after July 1, 2010, including high-rise residential, must meet ASHRAE 90.1-2007. The bill further requires all new residential buildings constructed after December 31, 2025, and all new commercial buildings constructed after December 31, 2030 to be zero net energy capable. To be qualified as net zero energy capable, the building must be energy efficient enough that the building would consume zero energy if the building owner chose to install on-site generation.

  Crystal Nagyiski
Delaware Department of Natural Resources and Environmental Control
Division of Energy & Climate
1203 College Park Dr, Suite 101
Dover, DE 19903
Phone: (302) 735-3480
Fax: (302) 739-1840
Web Site:
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Disclaimer: The information presented on the DSIRE web site provides an unofficial overview of financial incentives and other policies. It does not constitute professional tax advice or other professional financial guidance, and it should not be used as the only source of information when making purchasing decisions, investment decisions or tax decisions, or when executing other binding agreements. Please refer to the individual contact provided below each summary to verify that a specific financial incentive or other policy applies to your project.

While the DSIRE staff strives to provide the best information possible, the DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. make no representations or warranties, either express or implied, concerning the accuracy, completeness, reliability or suitability of the information. The DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. disclaim all liability of any kind arising out of your use or misuse of the information contained or referenced on DSIRE Web pages.

Copyright 2014 - 2015 North Carolina State University, under NREL Subcontract No. XEU-0-99515-01. Permission granted only for personal or educational use, or for use by or on behalf of the U.S. government. North Carolina State University prohibits the unauthorized display, reproduction, sale, and/or distribution of all or portions of the content of the Database of State Incentives for Renewables and Efficiency (DSIRE) without prior, written consent.