Building Energy Code

June 18, 2023


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.

The 2018 IECC is in effect for all residential and commercial buildings, Idaho schools, and Idaho jurisdictions that adopt and enforce building codes, unless a local code exists that is more stringent. Updated codes are adopted every three years by the Idaho Legislature as they are revised by the International Code Council. The most recent code took effect January 1, 2021

Enforcement of building and energy codes is handled by local building code adopters. Energy codes for state facilities and modular prefabricated buildings are enforced by the Idaho Division of Building Safety.

Program Overview

Implementing Sector: State
Category: Regulatory Policy
State: Idaho
Incentive Type: Building Energy Code
Web Site:
Start Date:
Eligible Renewable/Other Technologies:
  • Comprehensive Measures/Whole Building
Residential Code: 2018 IECC with amendments. REScheck is an available tool to check compliance.
Commercial Code: 2018 IECC and ASHRAE 90.1-2016. COMcheck is an available tool to check compliance.
Code Change Cycle: Three-year code review cycle, concurrent with the publication of new editions of the model codes. Most recent code effective January 1, 2021.


Name: Arlan Smith
Organization: Idaho Division of Building Safety
Address: 1090 E. Watertower St, Suite 150
Meridian ID 83642
Phone: (208) 332-7123

This information is sourced from DSIRE; the most comprehensive source of information on incentives and policies that support renewables and energy efficiency in the United States. Established in 1995, DSIRE is operated by the N.C. Clean Energy Technology Center at N.C. State University.