Arkansas holds commercial buildings to an energy code based on the 2009 IECC, alongside a 2021 mechanical code. Knowing which edition each part of a project is held to is where our work on an Arkansas project starts.

The same services in every state

Adicot provides the same engineering services in every state it is licensed in, for industrial, commercial and multi-family buildings of any size. What changes from state to state is the code the work is held to.

Cooling Load/Heat Load Calculations: room-by-room loads worked with ASHRAE methods, with ventilation rates to the adopted code
Energy Code Compliance: the building modeled and compliance demonstrated on performance where the code allows it, in the format the plan reviewer expects

Both are sealed by a professional engineer licensed in the state. Get a Quote to see the fee.

We work on industrial buildings, commercial buildings from offices and retail to restaurants and clinics, and multi-family buildings.

The codes in force in Arkansas

As of October 2026:

Energy: the Arkansas Energy Code, based on the 2009 International Energy Conservation Code and ASHRAE 90.1-2007, mandatory statewide since January 1, 2015. The Arkansas Energy Office is drafting an update based on a newer IECC; no effective date has been published.
Mechanical: the Arkansas Mechanical Code, which is the 2021 International Mechanical Code without amendments, in effect statewide since 2022 under the HVACR Licensing Board.
Building: the 2021 Arkansas Fire Prevention Code, whose Volume II is the 2021 International Building Code with Arkansas amendments, in effect since January 1, 2023.

What is particular to Arkansas

Two code generations on one project. The ventilation rates come from a 2021 mechanical code, while energy compliance is held to a code based on the 2009 IECC and 90.1-2007. The two are worked from the same inputs but checked against different editions, so each is cited on the output.

Climate. Most of Arkansas is climate zone 3A. The northern counties, including Benton, Washington, Boone and Baxter, are zone 4A. Summers are humid statewide, so the latent load is worked explicitly, and the north carries a real heating load.

Little Rock follows the state codes and takes on each new state adoption on the state's effective date.