Building Energy Codes

Delaware has adopted national and international energy conservation standards to guide statewide rules and regulations for the building sector. DNREC’s Division of Climate, Coastal and Energy issues and regularly updates regulations based on these standards, which come from the International Code Council (ICC) and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

Delaware transitioned to new energy conservation codes in 2020.

Help With the Transition

Delaware Energy Code Support Hotline

Call us at 1-877-494-1333
or email your questions

Energy code transition periods can be challenging for anyone involved in building design, construction, or code enforcement. In recognition of these challenges, DNREC offers energy code technical support via telephone and email.

The hotline is open for questions relating to the residential or commercial provisions of the 2018 IECC or ASHRAE 90.1-2016.

Training Opportunities

DNREC has also prepared training opportunities to assist Delaware’s construction industry and local government code enforcement officials.

Training sessions covering changes in the new residential and commercial energy conservation codes are offered at different times during the year. Sessions, when scheduled, will be posted here.

Recorded Training Webinars

Residential Training

Commercial Training

Recorded webinar versions of the commercial and residential training are available. Complete the registration form to gain access to the recordings and receive continuing education credits.

Additional meetings with stakeholders, technical support, and training opportunities will occur in stages during 2021.

Related Documents

Questions and Answers: Explore the Top Topics

Delaware Commercial Energy Code Compliance Paths Brochure

Delaware Residential Energy Code Compliance Paths Brochure

2012 to 2018 IECC Major Changes – Commercial Buildings

2012 to 2018 IECC Major Changes – Residential Buildings

Delaware ASHRAE 90.1-2016 Major Changes – Commercial Buildings

Final Determination Regarding Energy Efficiency Improvements in the 2018 IECC

U.S. DOE Energy Savings Analysis 2018 IECC for Residential Buildings

U.S. DOE Energy Savings Analysis ANSI/ASHRAE/IES Standard 90.1 2016


The state first established a minimum statewide code for energy conservation in 1979 with passage of legislation requiring local governments to meet the energy conservation requirements of a national model energy conservation code. Over the years, the legislature has updated the requirement to match changes in national and international model codes.

In 2009, the General Assembly approved an updated Code for Energy Conservation (16 Del.C. § 7602) which tied Delaware building and plumbing codes to the International Energy Conservation Code published by the International Code Council (ICC) and the Energy Standard for Buildings Except Low-Rise Residential Buildings published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

The legislation requires the Division of Climate, Coastal and Energy to review and update the state’s regulations every three years.

In 2014, the Division promulgated the Regulations for State Energy Conservation Code (7 DE Admin Code 2101), based on the 2012 International Energy Conservation Code and the 2010 edition of the ASHRAE Energy Standard for Buildings Except Low Rise Residential Buildings.

Enforcement and compliance with the energy code is determined at the local level, and varies depending on the county or municipality. The US Department of Energy provides a suite of compliance checklists and evaluation tools.

The Current Delaware Code

In June 2020, the Division amended the Regulations by adopting the 2018 International Energy Conservation Code and the ASHRAE 90.1 2016 Energy Standard for Buildings Except Low Rise Residential Buildings. These codes became effective on Dec. 11, 2020.

All projects must meet the requirements of the new energy codes (2018 IECC and ASHRAE 90.1 2016).

The code requires that a permanent certificate be posted on or in the electric panel. The certificates can be created using a Code Certificate template designed for printing on Avery or Uline labels.

The Delaware Energy Code Coalition

The Division of Climate, Coastal and Energy created the Delaware Energy Code Coalition in 2011, following a first recommendation in its Strategic Compliance Plan. Delaware was the first state to create a such a coalition.

The Coalition brings together a diverse group of state and local stakeholders responsible for advising the Division on energy code implementation, infrastructure, updates, and compliance. The members include representatives of homebuilders, building code officials, contractors, architects, the Delaware Sustainable Energy Utility, the Northeast Energy Efficiency Partnerships (NEEP) and the Building Codes Assistance Project (BCAP).

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