Ohio — Code Adoption Summary

Adoption model: Statewide-mandatory (Ohio Board of Building Standards). Commercial → Ohio Building Code; 1–3 family → Ohio Residential Code. Last verified: 2026-07-03 Confidence: verified Primary sources: Ohio Board of Building Standards / Dept. of Commerce — https://com.ohio.gov/divisions-and-programs/industrial-compliance · ICC OH — https://codes.iccsafe.org/codes/united-states/ohio

Statewide adopted codes — 2024 Ohio codes, effective 2024-03-01

Code family	Adopted edition	Notes	Source
Building	2024 OBC (2021 IBC base + OH amendments)	commercial, mandatory statewide	com.ohio.gov
Residential	Ohio Residential Code (2021 IRC base)	1–3 family	"
Electrical (NEC)	NEC 2023 + Ohio amendments	within OBC Ch. 27	up.codes/ohio
Mechanical	2024 OMC (2021 IMC base)		com.ohio.gov
Plumbing	2024 OPC (2021 IPC base)	Ohio = IPC	"
Energy (IECC)	IECC 2021 + Ohio amendments		"
Existing Building	2024 OEBC (2021 IEBC)		"

Solar PV / ESS / EV

Item	Status
NEC solar (690/705/706)	via NEC 2023
EV / energy	IECC 2021 provisions

Adoption model & precedence

• OBC applies statewide for commercial; local jurisdictions with certified building depts enforce it (state is AHJ where no certified local dept exists).
• Local amendments must be approved by the Board; generally more-stringent only.
• AHJ = certified local building department (or the state).

Major cities / counties

Jurisdiction	County	Notes	Building dept.
Columbus	Franklin	OBC + local admin	columbus.gov
Cleveland	Cuyahoga	OBC + local admin	clevelandohio.gov
Cincinnati	Hamilton	OBC + local admin	cincinnati-oh.gov
Toledo	Lucas	OBC (2024 update adopted)	toledo.oh.gov

AHJ fallback (when local adoption is unverified)

• State baseline (always applies): 2024 OBC (NEC 2023, IECC 2021, IPC 2021 base).
• Action: confirm the certified local building dept + any local admin amendments.

Change log

• 2026-07-03 — created; verified 2024 OBC (eff. 2024-03-01), NEC 2023 + OH amend., IECC 2021, IPC 2021 base.