International Energy Conservation Code, commercial
Ohio enforces the 2021 IECC commercial
The 2021 International Energy Conservation Code (IECC) for commercial buildings has been in force in Ohio since Mar 1, 2024. It applies statewide. Adopted by Ohio Board of Building Standards. The legal citation is OAC 4101:1-13-01; OAC 4101:1-35-01.
Record of adoption
Edition in force
2021 IECC
Ohio Building Code Chapter 13
Partial
- In force since
- Legal citation
- OAC 4101:1-13-01; OAC 4101:1-35-01
- Adopted by
- Ohio Board of Building Standards
- Applies
- Statewide
- State amendments
- Minor
- Also called
- OBC energy chapter
Chapter 35 lists IECC-21 and 90.1-19. Ohio deletes IECC C405.11 and C405.12 and ASHRAE 8.4.2, 8.4.3 and 10.4.6, and adds thermal-bridge options. Rule 4101:1-13-01 refiled effective Oct 15, 2025.
How Ohio adopts the IECC commercial
Commercial energy requirements are Chapter 13 of the Ohio Building Code and change only by Board of Building Standards rule, with hearing and JCARR filing; no statute names an IECC edition.
Cycle. Irregular; follows OBC updates (2017, 2018, 2024).
How it was checked
Partial
Researched in the state’s own record. The seal stays broken until the passage is on file word for word.
The state’s record was last read on , from three source pages.
Evidence 3 sources
Sources for the record itself come first, the state’s own records ahead of others. A label marks a source about something else, such as an exception. A source marked secondary is not the state’s own record.
“70-23 National Electrical Code (except that section 210.8(F) Exception No. 2 does not expire)”
“IFC - 21 International Fire Code except Chapter 12”
OAC 4101:1-35-01 Referenced standardsOhio Legislative Service Commission, codes.ohio.govcodes.ohio.gov (opens in a new tab)Administrative codeRetrieved “Chapter 13 of the International Building Code, 2021 edition, as incorporated by reference”
OAC 4101:1-13-01 Energy efficiencyOhio Legislative Service Commission, codes.ohio.govcodes.ohio.gov (opens in a new tab)Administrative codeRetrieved “October 15, 2025”
“11/1/2017, 3/1/2024”
Rule 4101:1-13-01 Energy efficiencyOhio Legislative Service Commission, codes.ohio.govcodes.ohio.gov (opens in a new tab)Administrative codeRetrieved
Tracker cross-checks
Code adoption trackers are a cross-check. They are not Ohio’s own record.
DOE’s energycodes.govCross-checkAgrees with the record
Commercial: 2021 IECC and ASHRAE 90.1-2019, effective 03/01/2024, Mandatory Statewide